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Configuración de OSPF en un Cisco 3725 (IOS) y Nexus 7000 (NX-OS)

A continuación, se muestra un ejemplo de configuración básica de OSPF entre un Switch Nexus y un Router 3725. Para habilitar OSPF en el Cisco Nexus se realiza desde la configuración de la interfaz.

Topologia en GNS3.

Habilitamos OSPF
N7K-2(config)# feature ospf
Habilitamos el proceso de OSPF
N7K-2(config)# router ospf 10
N7K-2(config-router)# router-id 10.10.10.1
Habilitamos OSPF en la interface en particular
N7K-2(config)# int ethernet 2/2
N7K-2(config-if)# ip address 10.10.10.1 255.255.255.0
N7K-2(config-if)# no shutdown
N7K-2(config-if)# ip router ospf 10 area 0
N7K-2(config-if)# end
N7K-2#
Configuración de OSPF en el Cisco 3725.
ESW1(config)#interface fastEthernet0/1
ESW1(config-if)#ip add 10.10.10.2 255.255.255.0
ESW1(config-if)#no shutdown

ESW1(config)#interface fastEthernet0/0
ESW1(config-if)#ip add 10.4.4.4 255.255.255.0
ESW1(config-if)#no shutdown
ESW1(config-if)#exit

ESW1(config)#interface loopback2
ESW1(config-if)#ip address 10.3.3.3 255.255.255.0
ESW1(config-if)#end

ESW1#show ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.4.4.4        YES manual up                    up      
FastEthernet0/1            10.10.10.2      YES manual up                    up      
FastEthernet1/0            unassigned      YES unset  up                    down    
FastEthernet1/14           unassigned      YES unset  up                    down    
FastEthernet1/15           unassigned      YES unset  up                    down    
Vlan1                      unassigned      YES unset  up                    down    
Loopback1                  10.2.2.2        YES manual up                    up      
Loopback2                  10.3.3.3        YES manual up                    up      

ESW1(config)#router ospf 10
ESW1(config-router)#network 10.10.10.0 0.0.0.255 area 0
*Mar  1 00:06:10.307: %OSPF-5-ADJCHG: Process 10, Nbr 10.10.10.1 on FastEthernet0/1 from LOADING to FULL, Loading Done
ESW1(config-router)#networ 10.4.4.0 0.0.0.255 area 0
ESW1(config-router)#

Verificación
ESW1#show ip ospf neighbor 

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.10.10.1        1   FULL/BDR        00:00:33    10.10.10.1      FastEthernet0/1
ESW1


ESW1#show cdp neighbors detail 
-------------------------
Device ID: N7K-2(Nexus-Switch)
Entry address(es): 
  IP address: 10.10.10.1
Platform: Nexus-Switch,  Capabilities: Router Switch IGMP 
Interface: FastEthernet0/1,  Port ID (outgoing port): Ethernet2/2
Holdtime : 165 sec

Version :
Cisco Nexus Operating System (NX-OS) Software, Version 5.1(2)

advertisement version: 2
Duplex: full

ESW1#
Verificación en el Cisco Nexus
N7K-2# show ip route
IP Route Table for VRF "default"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]

10.4.4.0/24, ubest/mbest: 1/0
    *via 10.10.10.2, Eth2/2, [110/50], 00:00:11, ospf-10, intra
10.10.10.0/24, ubest/mbest: 1/0, attached
    *via 10.10.10.1, Eth2/2, [0/0], 00:01:52, direct
10.10.10.1/32, ubest/mbest: 1/0, attached
    *via 10.10.10.1, Eth2/2, [0/0], 00:01:52, local
N7K-2#

N7K-2# show ip ospf neighbors
 OSPF Process ID 10 VRF default
 Total number of neighbors: 1
 Neighbor ID     Pri State            Up Time  Address         Interface
 10.3.3.3          1 FULL/DR          00:00:09 10.10.10.2      Eth2/2


N7K-2# ping 10.10.10.2
PING 10.10.10.2 (10.10.10.2): 56 data bytes
64 bytes from 10.10.10.2: icmp_seq=0 ttl=254 time=10 ms
64 bytes from 10.10.10.2: icmp_seq=1 ttl=254 time=10 ms
64 bytes from 10.10.10.2: icmp_seq=2 ttl=254 time=10 ms
64 bytes from 10.10.10.2: icmp_seq=3 ttl=254 time=10 ms
64 bytes from 10.10.10.2: icmp_seq=4 ttl=254 time=10 ms

--- 10.10.10.2 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 10/10/10 ms
N7K-2#

N7K-2# ping 10.4.4.4
PING 10.4.4.4 (10.4.4.4): 56 data bytes
64 bytes from 10.4.4.4: icmp_seq=0 ttl=254 time=10 ms
64 bytes from 10.4.4.4: icmp_seq=1 ttl=254 time=10 ms
64 bytes from 10.4.4.4: icmp_seq=2 ttl=254 time=0 ms
64 bytes from 10.4.4.4: icmp_seq=3 ttl=254 time=0 ms
64 bytes from 10.4.4.4: icmp_seq=4 ttl=254 time=10 ms

--- 10.4.4.4 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 0/6/10 ms
N7K-2#