Áreas no OSPF
Separar o OSPF em áreas é uma prática fundamental em redes maiores e mais organizadas, e faz toda a diferença para o desempenho, escalabilidade e a estabilidade do protocolo e da Rede.
Vamos imaginar que você tem uma rede com dezenas ou centenas de roteadores. Todos eles precisam compartilhar informações sobre os links que estão ativos, os caminhos disponíveis, e as mudanças que ocorrem. Em OSPF, essas informações ficam num banco chamado LSDB (Link State Database). Se todos os roteadores estiverem em uma única área, cada mudança em qualquer parte da rede obriga todos os roteadores a recalcularem suas rotas. Isso gera muito processamento, muitas mensagens trocadas e um LSDB gigante que consome memória e CPU, mesmo para roteadores que estão longe da parte da rede onde a mudança aconteceu.
Ao separar o OSPF em áreas, você resolve esse problema. Uma área OSPF é um "pedaço" da rede, isolado logicamente. Dentro de uma área, os roteadores compartilham os detalhes de seus links, mas esses detalhes não são repassados para fora da área. Em vez disso, os roteadores de borda de área (os chamados ABRs) resumem as rotas e enviam só as informações essenciais para o backbone OSPF (a Área 0) e para outras áreas. Isso reduz drasticamente o tamanho do LSDB em cada roteador e limita o impacto das mudanças a apenas uma parte da rede.
Além disso, separar em áreas ajuda a organizar logicamente a rede, agrupar por setores, locais físicos, departamentos ou tipos de serviços. Isso facilita o gerenciamento e o diagnóstico de problemas: se algo está errado na Área 10, você sabe exatamente onde procurar.
Configurando o Ambiente
Antes de começar a configurar o OSPF, temos que configurar o ambiente para nossa rede de exemplo. Vamos começar criando um lab usando a topologia da imagem abaixo.
Configurando o GW1
enable
configure terminal
hostname gw1
no ip domain-lookup
!
interface GigabitEthernet0/0
description OSPF com GW2
ip address 10.253.35.1 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface GigabitEthernet0/1
description OSPF com Core1
ip address 10.253.35.5 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface Loopback0
ip address 10.255.0.1 255.255.255.255
!
router ospf 1
router-id 10.255.0.1
!
end
wr
Configurando o Core1
enable
configure terminal
hostname core1
no ip domain-lookup
!
interface GigabitEthernet0/0
description OSPF com GW1
ip address 10.253.35.6 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface GigabitEthernet0/1
description OSPF com Distribution1
ip address 10.253.35.13 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 10
no shut
!
interface Loopback0
ip address 10.255.0.2 255.255.255.255
!
router ospf 1
router-id 10.255.0.2
!
end
wr
Configurando o distribution1
enable
configure terminal
hostname distribution1
no ip domain-lookup
!
ip dhcp excluded-address 192.168.32.1 192.168.32.10
ip dhcp excluded-address 10.16.32.1 10.16.32.10
!
ip dhcp pool VLAN10-RH
network 192.168.32.0 255.255.255.0
default-router 192.168.32.1
dns-server 8.8.8.8
!
ip dhcp pool VLAN20-ADM
network 10.16.32.0 255.255.255.0
default-router 10.16.32.1
dns-server 8.8.8.8
!
interface Ethernet0/0
description OSPF com Core1
ip address 10.253.35.14 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 10
no shut
!
interface Ethernet0/1
description switch rh
ip address 192.168.32.1 255.255.255.0
no shut
!
interface Ethernet0/2
description switch adm
ip address 10.16.32.1 255.255.255.0
no shut
!
interface Loopback0
ip address 10.255.0.3 255.255.255.255
!
router ospf 1
router-id 10.255.0.3
network 192.168.32.0 0.0.0.255 area 10
network 10.16.32.0 0.0.0.255 area 10
passive-interface Ethernet0/1
passive-interface Ethernet0/2
!
end
wr
Configurando o switch rh
enable
configure terminal
hostname sw-rh
!
vlan 10
name RH
!
# Configurar a interface com o distribution1:
interface ethernet0/0
description uplink para distribution1
switchport mode access
switchport access vlan 10
no shutdown
!
# Configurar a interface com o cliente:
interface ethernet0/1
description host01
switchport mode access
switchport access vlan 10
no shutdown
!
end
copy running-config startup-config
Configurando o switch adm
enable
configure terminal
hostname sw-adm
!
vlan 20
name ADM
!
# Configurar a interface com o distribution1:
interface ethernet0/0
description uplink para distribution1
switchport mode access
switchport access vlan 20
no shutdown
!
# Configurar a interface com o cliente:
interface ethernet0/1
description host01
switchport mode access
switchport access vlan 20
no shutdown
!
end
copy running-config startup-config
Configurando o GW2
enable
configure terminal
hostname gw2
no ip domain-lookup
!
interface GigabitEthernet0/0
description OSPF com GW1
ip address 10.253.35.2 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface GigabitEthernet0/1
description OSPF com Core2
ip address 10.253.35.9 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface Loopback0
ip address 10.255.0.4 255.255.255.255
!
router ospf 1
router-id 10.255.0.4
!
end
wr
Configurando o Core2
enable
configure terminal
hostname core2
no ip domain-lookup
!
interface GigabitEthernet0/0
description OSPF com GW2
ip address 10.253.35.10 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 0
no shut
!
interface GigabitEthernet0/1
description OSPF com Distribution2
ip address 10.253.35.17 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 20
no shut
!
interface Loopback0
ip address 10.255.0.5 255.255.255.255
!
router ospf 1
router-id 10.255.0.5
!
end
wr
Configurando o distribution2
enable
configure terminal
hostname distribution2
no ip domain-lookup
!
ip dhcp excluded-address 192.168.10.1 192.168.10.10
ip dhcp excluded-address 172.16.32.1 172.16.32.10
!
ip dhcp pool VLAN30-FINANCEIRO
network 172.16.32.0 255.255.255.0
default-router 172.16.32.1
dns-server 8.8.8.8
!
ip dhcp pool VLAN40-SYSADMIN
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 8.8.8.8
!
interface Ethernet0/0
description OSPF com Core2
ip address 10.253.35.18 255.255.255.252
ip ospf network point-to-point
ip ospf 1 area 20
no shut
!
interface Ethernet0/1
description switch financeiro
ip address 172.16.32.1 255.255.255.0
no shut
!
interface Ethernet0/2
description switch sysadmin
ip address 192.168.10.1 255.255.255.0
no shut
!
interface Loopback0
ip address 10.255.0.6 255.255.255.255
!
router ospf 1
router-id 10.255.0.6
network 192.168.10.0 0.0.0.255 area 20
network 172.16.32.0 0.0.0.255 area 20
passive-interface Ethernet0/1
passive-interface Ethernet0/2
!
end
wr
Configurando o switch financeiro
enable
configure terminal
hostname sw-financeiro
!
vlan 30
name financeiro
!
# Configurar a interface com o distribution1:
interface ethernet0/0
description uplink para distribution2
switchport mode access
switchport access vlan 30
no shutdown
!
# Configurar a interface com o cliente:
interface ethernet0/1
description host01
switchport mode access
switchport access vlan 30
no shutdown
!
end
copy running-config startup-config
Configurando o switch sysadmin
enable
configure terminal
hostname sw-adm
!
vlan 40
name SYSADMIN
!
# Configurar a interface com o distribution2:
interface ethernet0/0
description uplink para distribution2
switchport mode access
switchport access vlan 40
no shutdown
!
# Configurar a interface com o cliente:
interface ethernet0/1
description host01
switchport mode access
switchport access vlan 40
no shutdown
!
end
copy running-config startup-config
Verificando o estado do OSPF no GW1
# Exibe quais redes e interfaces participam do OSPF:
gw1#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.1
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
Routing on Interfaces Configured Explicitly (Area 0):
GigabitEthernet0/1
GigabitEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
10.255.0.2 110 00:06:42
Distance: (default is 110)
# Exibe detalhes por interface:
gw1#show ip ospf interface
GigabitEthernet0/1 is up, line protocol is up
Internet Address 10.253.35.5/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.1, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:05
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/2/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.2
Suppress hello for 0 neighbor(s)
GigabitEthernet0/0 is up, line protocol is up
Internet Address 10.253.35.1/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.1, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:06
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
gw1#show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Gi0/1 1 0 10.253.35.5/30 1 P2P 1/1
Gi0/0 1 0 10.253.35.1/30 1 P2P 0/0
# Status de adjacência com vizinhos:
gw1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.2 0 FULL/ - 00:00:39 10.253.35.6 GigabitEthernet0/1
# Exibe a LSDB (por tipo de LSA)
gw1#show ip ospf database
OSPF Router with ID (10.255.0.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.1 10.255.0.1 1472 0x80000002 0x0087E2 3
10.255.0.2 10.255.0.2 1475 0x80000002 0x00B4EB 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.2 594 0x80000003 0x00E801
10.253.35.12 10.255.0.2 1580 0x80000001 0x00B546
192.168.32.0 10.255.0.2 594 0x80000003 0x007A20
# Rotas aprendidas via OSPF:
gw1#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O IA 10.16.32.0/24 [110/12] via 10.253.35.6, 00:08:59, GigabitEthernet0/1
O IA 10.253.35.12/30 [110/2] via 10.253.35.6, 00:23:36, GigabitEthernet0/1
O IA 192.168.32.0/24 [110/12] via 10.253.35.6, 00:08:59, GigabitEthernet0/1
Verificando o estado do OSPF no Core1
# Exibe quais redes e interfaces participam do OSPF:
core1#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.2
It is an area border router
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
Routing on Interfaces Configured Explicitly (Area 0):
GigabitEthernet0/0
Routing on Interfaces Configured Explicitly (Area 10):
GigabitEthernet0/1
Routing Information Sources:
Gateway Distance Last Update
10.255.0.1 110 00:27:04
10.255.0.3 110 00:12:34
Distance: (default is 110)
# Exibe detalhes por interface:
core1#show ip ospf interface
GigabitEthernet0/0 is up, line protocol is up
Internet Address 10.253.35.6/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.2, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 2, maximum is 2
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.1
Suppress hello for 0 neighbor(s)
GigabitEthernet0/1 is up, line protocol is up
Internet Address 10.253.35.13/30, Area 10, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.2, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.3
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
core1# show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Gi0/0 1 0 10.253.35.6/30 1 P2P 1/1
Gi0/1 1 10 10.253.35.13/30 1 P2P 1/1
# Status de adjacência com vizinhos:
core1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.1 0 FULL/ - 00:00:34 10.253.35.5 GigabitEthernet0/0
10.255.0.3 0 FULL/ - 00:00:31 10.253.35.14 GigabitEthernet0/1
# Exibe a LSDB (por tipo de LSA)
core1#show ip ospf database
OSPF Router with ID (10.255.0.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.1 10.255.0.1 1701 0x80000002 0x0087E2 3
10.255.0.2 10.255.0.2 1702 0x80000002 0x00B4EB 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.2 822 0x80000003 0x00E801
10.253.35.12 10.255.0.2 1808 0x80000001 0x00B546
192.168.32.0 10.255.0.2 822 0x80000003 0x007A20
Router Link States (Area 10)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.2 10.255.0.2 837 0x80000006 0x00D3B7 2
10.255.0.3 10.255.0.3 835 0x80000006 0x000779 4
Summary Net Link States (Area 10)
Link ID ADV Router Age Seq# Checksum
10.253.35.0 10.255.0.2 1697 0x80000001 0x0038CE
10.253.35.4 10.255.0.2 1808 0x80000001 0x0006FD
# Rotas aprendidas via OSPF:
core1#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O 10.16.32.0/24 [110/11] via 10.253.35.14, 00:14:31, GigabitEthernet0/1
O 10.253.35.0/30 [110/2] via 10.253.35.5, 00:29:02, GigabitEthernet0/0
O 192.168.32.0/24 [110/11] via 10.253.35.14, 00:14:31, GigabitEthernet0/1
Verificando o estado do OSPF no Distribution1
# Exibe quais redes e interfaces participam do OSPF:
distribution1#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.3
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
10.16.32.0 0.0.0.255 area 10
192.168.32.0 0.0.0.255 area 10
Routing on Interfaces Configured Explicitly (Area 10):
Ethernet0/0
Routing Information Sources:
Gateway Distance Last Update
10.255.0.2 110 00:15:21
Distance: (default is 110)
# Exibe detalhes por interface:
distribution1#show ip ospf interface
Ethernet0/1 is up, line protocol is up
Internet Address 192.168.32.1/24, Area 10, Attached via Network Statement
Process ID 1, Router ID 10.255.0.3, Network Type BROADCAST, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.255.0.3, Interface address 192.168.32.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 3/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Ethernet0/2 is up, line protocol is up
Internet Address 10.16.32.1/24, Area 10, Attached via Network Statement
Process ID 1, Router ID 10.255.0.3, Network Type BROADCAST, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.255.0.3, Interface address 10.16.32.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Ethernet0/0 is up, line protocol is up
Internet Address 10.253.35.14/30, Area 10, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.3, Network Type POINT_TO_POINT, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:07
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.2
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
distribution1#show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Et0/1 1 10 192.168.32.1/24 10 DR 0/0
Et0/2 1 10 10.16.32.1/24 10 DR 0/0
Et0/0 1 10 10.253.35.14/30 10 P2P 1/1
# Status de adjacência com vizinhos:
distribution1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.2 0 FULL/ - 00:00:30 10.253.35.13 Ethernet0/0
# Exibe a LSDB (por tipo de LSA)
distribution1#show ip ospf database
OSPF Router with ID (10.255.0.3) (Process ID 1)
Router Link States (Area 10)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.2 10.255.0.2 1112 0x80000006 0x00D3B7 2
10.255.0.3 10.255.0.3 1108 0x80000006 0x000779 4
Summary Net Link States (Area 10)
Link ID ADV Router Age Seq# Checksum
10.253.35.0 10.255.0.2 40 0x80000002 0x0036CF
10.253.35.4 10.255.0.2 40 0x80000002 0x0004FE
# Rotas aprendidas via OSPF:
distribution1#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O IA 10.253.35.0/30 [110/12] via 10.253.35.13, 00:18:41, Ethernet0/0
O IA 10.253.35.4/30 [110/11] via 10.253.35.13, 00:18:41, Ethernet0/0
# Rotas:
distribution1#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
C 10.16.32.0/24 is directly connected, Ethernet0/2
L 10.16.32.1/32 is directly connected, Ethernet0/2
O IA 10.253.35.0/30 [110/12] via 10.253.35.13, 00:19:19, Ethernet0/0
O IA 10.253.35.4/30 [110/11] via 10.253.35.13, 00:19:19, Ethernet0/0
C 10.253.35.12/30 is directly connected, Ethernet0/0
L 10.253.35.14/32 is directly connected, Ethernet0/0
C 10.255.0.3/32 is directly connected, Loopback0
192.168.32.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.32.0/24 is directly connected, Ethernet0/1
L 192.168.32.1/32 is directly connected, Ethernet0/1
Verificando o estado do OSPF no GW2
# Exibe quais redes e interfaces participam do OSPF:
gw2#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.4
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
Routing on Interfaces Configured Explicitly (Area 0):
GigabitEthernet0/1
GigabitEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
10.255.0.5 110 00:03:09
10.255.0.1 110 00:03:41
10.255.0.2 110 00:03:41
Distance: (default is 110)
# Exibe detalhes por interface:
gw2#show ip ospf interface
GigabitEthernet0/1 is up, line protocol is up
Internet Address 10.253.35.9/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.4, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/2/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 2
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.5
Suppress hello for 0 neighbor(s)
GigabitEthernet0/0 is up, line protocol is up
Internet Address 10.253.35.2/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.4, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 2, maximum is 2
Last flood scan time is 0 msec, maximum is 1 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.1
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
gw2#show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Gi0/1 1 0 10.253.35.9/30 1 P2P 1/1
Gi0/0 1 0 10.253.35.2/30 1 P2P 1/1
# Status de adjacência com vizinhos:
gw2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.5 0 FULL/ - 00:00:34 10.253.35.10 GigabitEthernet0/1
10.255.0.1 0 FULL/ - 00:00:39 10.253.35.1 GigabitEthernet0/
# Exibe a LSDB (por tipo de LSA)
gw2#show ip ospf database
OSPF Router with ID (10.255.0.4) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.1 10.255.0.1 225 0x80000005 0x00140A 4
10.255.0.2 10.255.0.2 326 0x80000004 0x00B0ED 2
10.255.0.4 10.255.0.4 339 0x80000003 0x0056BA 4
10.255.0.5 10.255.0.5 341 0x80000001 0x00355B 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.2 1575 0x80000004 0x00E602
10.253.35.12 10.255.0.2 326 0x80000003 0x00B148
10.253.35.16 10.255.0.5 341 0x80000001 0x007B79
172.16.32.0 10.255.0.5 316 0x80000001 0x0098AD
192.168.10.0 10.255.0.5 316 0x80000001 0x005F50
192.168.32.0 10.255.0.2 1575 0x80000004 0x007821
# Rotas aprendidas via OSPF:
gw2#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 3 masks
O IA 10.16.32.0/24 [110/13] via 10.253.35.1, 00:06:07, GigabitEthernet0/0
O 10.253.35.4/30 [110/2] via 10.253.35.1, 00:06:07, GigabitEthernet0/0
O IA 10.253.35.12/30 [110/3] via 10.253.35.1, 00:06:07, GigabitEthernet0/0
O IA 10.253.35.16/30
[110/2] via 10.253.35.10, 00:05:55, GigabitEthernet0/1
172.16.0.0/24 is subnetted, 1 subnets
O IA 172.16.32.0 [110/12] via 10.253.35.10, 00:05:35, GigabitEthernet0/1
O IA 192.168.10.0/24 [110/12] via 10.253.35.10, 00:05:35, GigabitEthernet0/1
O IA 192.168.32.0/24 [110/13] via 10.253.35.1, 00:06:07, GigabitEthernet0/0
Verificando o estado do OSPF no Core1
# Exibe quais redes e interfaces participam do OSPF:
core2#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.5
It is an area border router
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
Routing on Interfaces Configured Explicitly (Area 0):
GigabitEthernet0/0
Routing on Interfaces Configured Explicitly (Area 20):
GigabitEthernet0/1
Routing Information Sources:
Gateway Distance Last Update
10.255.0.4 110 00:07:13
10.255.0.6 110 00:06:50
10.255.0.1 110 00:07:13
10.255.0.2 110 00:07:13
Distance: (default is 110)
# Exibe detalhes por interface:
core2#show ip ospf interface
GigabitEthernet0/0 is up, line protocol is up
Internet Address 10.253.35.10/30, Area 0, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.5, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:05
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 2, maximum is 2
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.4
Suppress hello for 0 neighbor(s)
GigabitEthernet0/1 is up, line protocol is up
Internet Address 10.253.35.17/30, Area 20, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.5, Network Type POINT_TO_POINT, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:08
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.6
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
core2#show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Gi0/0 1 0 10.253.35.10/30 1 P2P 1/1
Gi0/1 1 20 10.253.35.17/30 1 P2P 1/1
# Status de adjacência com vizinhos:
core2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.4 0 FULL/ - 00:00:39 10.253.35.9 GigabitEthernet0/0
10.255.0.6 0 FULL/ - 00:00:39 10.253.35.18 GigabitEthernet0/1
# Exibe a LSDB (por tipo de LSA)
core2#show ip ospf database
OSPF Router with ID (10.255.0.5) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.1 10.255.0.1 431 0x80000005 0x00140A 4
10.255.0.2 10.255.0.2 531 0x80000004 0x00B0ED 2
10.255.0.4 10.255.0.4 545 0x80000003 0x0056BA 4
10.255.0.5 10.255.0.5 544 0x80000001 0x00355B 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.2 1781 0x80000004 0x00E602
10.253.35.12 10.255.0.2 531 0x80000003 0x00B148
10.253.35.16 10.255.0.5 544 0x80000001 0x007B79
172.16.32.0 10.255.0.5 519 0x80000001 0x0098AD
192.168.10.0 10.255.0.5 519 0x80000001 0x005F50
192.168.32.0 10.255.0.2 1781 0x80000004 0x007821
Router Link States (Area 20)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.5 10.255.0.5 524 0x80000003 0x005825 2
10.255.0.6 10.255.0.6 525 0x80000002 0x00F0F5 4
Summary Net Link States (Area 20)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.5 542 0x80000001 0x00F8EC
10.253.35.0 10.255.0.5 542 0x80000001 0x0026DD
10.253.35.4 10.255.0.5 542 0x80000001 0x0008F6
10.253.35.8 10.255.0.5 544 0x80000001 0x00CB31
10.253.35.12 10.255.0.5 542 0x80000001 0x00C134
192.168.32.0 10.255.0.5 542 0x80000001 0x008A0C
# Rotas aprendidas via OSPF:
core2#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 3 masks
O IA 10.16.32.0/24 [110/14] via 10.253.35.9, 00:09:24, GigabitEthernet0/0
O 10.253.35.0/30 [110/2] via 10.253.35.9, 00:09:24, GigabitEthernet0/0
O 10.253.35.4/30 [110/3] via 10.253.35.9, 00:09:24, GigabitEthernet0/0
O IA 10.253.35.12/30 [110/4] via 10.253.35.9, 00:09:24, GigabitEthernet0/0
172.16.0.0/24 is subnetted, 1 subnets
O 172.16.32.0 [110/11] via 10.253.35.18, 00:09:01, GigabitEthernet0/1
O 192.168.10.0/24 [110/11] via 10.253.35.18, 00:09:01, GigabitEthernet0/1
O IA 192.168.32.0/24 [110/14] via 10.253.35.9, 00:09:24, GigabitEthernet0/0
Verificando o estado do OSPF no Distribution1
# Exibe quais redes e interfaces participam do OSPF:
distribution2#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.255.0.6
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
172.16.32.0 0.0.0.255 area 20
192.168.10.0 0.0.0.255 area 20
Routing on Interfaces Configured Explicitly (Area 20):
Ethernet0/0
Routing Information Sources:
Gateway Distance Last Update
10.255.0.5 110 00:10:01
Distance: (default is 110)
# Exibe detalhes por interface:
distribution2#show ip ospf interface
Ethernet0/1 is up, line protocol is up
Internet Address 172.16.32.1/24, Area 20, Attached via Network Statement
Process ID 1, Router ID 10.255.0.6, Network Type BROADCAST, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.255.0.6, Interface address 172.16.32.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 3/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Ethernet0/2 is up, line protocol is up
Internet Address 192.168.10.1/24, Area 20, Attached via Network Statement
Process ID 1, Router ID 10.255.0.6, Network Type BROADCAST, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.255.0.6, Interface address 192.168.10.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:04
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Ethernet0/0 is up, line protocol is up
Internet Address 10.253.35.18/30, Area 20, Attached via Interface Enable
Process ID 1, Router ID 10.255.0.6, Network Type POINT_TO_POINT, Cost: 10
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Enabled by interface config, including secondary ip addresses
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.255.0.5
Suppress hello for 0 neighbor(s)
# Resumo das interfaces no OSPF
distribution2#show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Et0/1 1 20 172.16.32.1/24 10 DR 0/0
Et0/2 1 20 192.168.10.1/24 10 DR 0/0
Et0/0 1 20 10.253.35.18/30 10 P2P 1/1
# Status de adjacência com vizinhos:
distribution2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.255.0.5 0 FULL/ - 00:00:37 10.253.35.17 Ethernet0/0
# Exibe a LSDB (por tipo de LSA)
distribution2#show ip ospf database
OSPF Router with ID (10.255.0.6) (Process ID 1)
Router Link States (Area 20)
Link ID ADV Router Age Seq# Checksum Link count
10.255.0.5 10.255.0.5 651 0x80000003 0x005825 2
10.255.0.6 10.255.0.6 649 0x80000002 0x00F0F5 4
Summary Net Link States (Area 20)
Link ID ADV Router Age Seq# Checksum
10.16.32.0 10.255.0.5 669 0x80000001 0x00F8EC
10.253.35.0 10.255.0.5 669 0x80000001 0x0026DD
10.253.35.4 10.255.0.5 669 0x80000001 0x0008F6
10.253.35.8 10.255.0.5 671 0x80000001 0x00CB31
10.253.35.12 10.255.0.5 669 0x80000001 0x00C134
192.168.32.0 10.255.0.5 669 0x80000001 0x008A0C
# Rotas aprendidas via OSPF:
distribution2#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 8 subnets, 3 masks
O IA 10.16.32.0/24 [110/24] via 10.253.35.17, 00:11:03, Ethernet0/0
O IA 10.253.35.0/30 [110/12] via 10.253.35.17, 00:11:03, Ethernet0/0
O IA 10.253.35.4/30 [110/13] via 10.253.35.17, 00:11:03, Ethernet0/0
O IA 10.253.35.8/30 [110/11] via 10.253.35.17, 00:11:03, Ethernet0/0
O IA 10.253.35.12/30 [110/14] via 10.253.35.17, 00:11:03, Ethernet0/0
O IA 192.168.32.0/24 [110/24] via 10.253.35.17, 00:11:03, Ethernet0/0
# Rotas:
distribution2#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 8 subnets, 3 masks
O IA 10.16.32.0/24 [110/24] via 10.253.35.17, 00:11:33, Ethernet0/0
O IA 10.253.35.0/30 [110/12] via 10.253.35.17, 00:11:33, Ethernet0/0
O IA 10.253.35.4/30 [110/13] via 10.253.35.17, 00:11:33, Ethernet0/0
O IA 10.253.35.8/30 [110/11] via 10.253.35.17, 00:11:33, Ethernet0/0
O IA 10.253.35.12/30 [110/14] via 10.253.35.17, 00:11:33, Ethernet0/0
C 10.253.35.16/30 is directly connected, Ethernet0/0
L 10.253.35.18/32 is directly connected, Ethernet0/0
C 10.255.0.6/32 is directly connected, Loopback0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.32.0/24 is directly connected, Ethernet0/1
L 172.16.32.1/32 is directly connected, Ethernet0/1
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, Ethernet0/2
L 192.168.10.1/32 is directly connected, Ethernet0/2
O IA 192.168.32.0/24 [110/24] via 10.253.35.17, 00:11:33, Ethernet0/0