Cisco Ex SERIES Manual de usuario descargar pdf (Pagina 15)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

MTU for the IP packet. Cisco NX-OS, as in the Nexus 7010, uses only the mtu keyword

to cover Ethernet frame length:

Nexus7010# configure terminal

Nexus7010(config)# system jumbomtu 9216

Nexus7010(config)# interface Ethernet3/3

Nexus7010(config-if)# description to Juniper VCF xe-1/0/2

Nexus7010(config-if)# mtu 9216

Nexus7010(config-if)# ip address 192.18.64.1/24

Nexus7010(config-if)# no shutdown

Nexus7010(config-if)# exit

Nexus7010(config)# router ospf 1

Nexus7010(config-rtr)# log-adjacency-changes

Nexus7010(config-rtr)# network 192.18.64.0 0.0.0.255 area 0

Nexus7010(config-rtr)# end

The above example is for Nexus 7000 series switches. On Catalyst 3850 switches, the

global configuration system mtu routing command sets IP MTU size:

Cat3850# configure terminal

Cat3850(config)# system mtu routing 9198

Cat3850(config)# interface TenGigabitEthernet1/0/1

Cat3850(config-if)# no switchport

Cat3850(config-if)# ip address 10.0.0.1 255.255.255.0

Cat3850(config-if)# exit

Cat3850(config)# router ospf 1

Cat3850(config-rtr)# log-adjacency-changes

Cat3850(config-rtr)# network 10.0.0.0 0.0.0.255 area 0

Cat3850(config-rtr)# end

The commands above have been verified with Catalyst 3850 and 3750-E switches routing

jumbo frames. On some versions of IOS, the Catalyst 3750 may instead use the global

system mtu jumbo <value> command.

Validation!

Unless both Juniper and Cisco interfaces agree on MTU size, OSPF routing adjacencies

will remain in ExStart state, and will never transition to OSPF “full” state. To verify that

an OSPF adjacency has entered OSPF “full” state on Juniper switches, use the show

ospf neighbor command:

admin@VCF> show ospf neigbhor

Address Interface State ID Pri Dead

192.18.64.1 xe-1/0/2.0 Full 192.18.64.1 1 32

On the Cisco device, use the show ip ospf neighbor command:

Nexus7010# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

192.18.64.2 128 FULL/BDR 00:00:35 192.18.64.2

Ethernet3/3

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 82 83

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Cisco Ex SERIES Manual de usuario Pagina 15

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