Cisco Ex SERIES Manual de usuario descargar pdf (Pagina 54)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

admin@VCF# set interfaces xe-1/0/2 disable

admin@VCF# commit

Now the show redundant-trunk-group command will indicate the primary

interface is down while the secondary interface remains up:

admin@VCF# show redundant-trunk-group

root@VCF# run show redundant-trunk-group group rtg0

Interface State Bandwidth Time of last flap

Flap

count

xe-1/0/2.0 Dwn/Pri 10 Gbps 2014-04-18 01:47:25 (00:00:11 ago)

xe-1/0/10.0 Up/Act 10 Gbps 2014-04-18 01:38:23 (00:09:13 ago)

Note also that the command output indicates when the primary interface went down and

that its flap count has incremented by 1.

Again, after offering traffic from Spirent TestCenter, the packet counters for both

interfaces will indicate that the switch forwarded all traffic to interface xe-1/0/10.0, the

secondary path in the RTG.

Spanning&tree&case&1:&Rapid&spanning&tree&protocol&(RSTP)&

Objective!

To verify interoperability of a rapid spanning tree topology between Juniper and Cisco

switches.

To measure convergence time of a rapid spanning tree topology between Juniper and

Cisco switches after link failure.

Background!

The spanning tree protocol is widely used in Ethernet networks for loop prevention and

redundancy. Rapid spanning tree, defined in IEEE 802.1w, provides much faster

convergence time after a link or device failure than the original 802.1D spanning tree

specification.

Topology!

This example uses redundant links between two Juniper switches and one Cisco switch.

Junos running on Juniper EX switches supports rapid spanning tree protocol (RSTP) by

default. Cisco switches also support spanning tree by default; although Cisco IOS defines

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Cisco Ex SERIES Manual de usuario Pagina 54