Cisco Ex SERIES Manual de usuario descargar pdf (Pagina 64)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

admin@VCF> show spanning-tree interface brief

Interface Port ID Designated Designated Port State Role

port ID bridge ID Cost

xe-1/0/2 128:491 128:387 32768.0024f7189ec1 2000 FWD ROOT

ge-0/0/12 128:616 128:490 32768.100e7ea6ffc1 20000 BLK ALT

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role

port ID bridge ID Cost

xe-1/0/40 128:493 128:493 32769.100e7eb06791 2000 FWD DESG

ge-0/0/12 128:616 128:490 32769.100e7ea6ffc1 20000 BLK ALT

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role

port ID bridge ID Cost

xe-1/0/2 128:491 128:387 32770.0024f7189ec1 2000 FWD ROOT

ge-0/0/12 128:616 128:490 32770.100e7ea6ffc1 20000 BLK ALT

The equivalent command for the Cisco Nexus 7010 is “show spanning-tree

<vlan ID>”. In this example, the Nexus 7010 is the root bridge for VLAN 2001.

Nexus7010# show spanning-tree vlan 2001

MST0001

Spanning tree enabled protocol mstp

Root ID Priority 32769

Address 0024.f718.9ec1

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0024.f718.9ec1

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Eth3/1 Desg FWD 2000 128.385 P2p

Eth3/3 Desg FWD 2000 128.387 P2p

To verify all switches send traffic only over the spanning tree interfaces in forwarding

state, generate a known quantity of frames from Spirent TestCenter or other source to

each VLAN and compare switch interface packet counters with those sent and received

on each interface. Interfaces in blocking state will receive spanning tree BPDU frames

but should transmit no frames.

To determine convergence time, disable one of the spanning tree interfaces in forwarding

state while offering a known quantity of frames from Spirent TestCenter or other traffic

generator. Convergence time can be derived from frame loss. For example, if Spirent

TestCenter generates traffic at a rate of 1,000 frames per second, each dropped frame is

equivalent to 1 millisecond of convergence time. If the switches drop 47 frames, then

rapid spanning tree convergence time is 47 ms.

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Cisco Ex SERIES Manual de usuario Pagina 64

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