VSS: how to troubleshoot path forwarding ?

Unanswered Question
Nov 6th, 2008
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In a VSS setup, how can i see if the switch if forwarding across the VSL link for some mac address ?


Example: suppose you have a MEC portchannel 30 with vlan 300 and on this vlan is mac address aaaa.aaaa.aaaa


when you do: show mac-address-table address aaaa.aaaa.aaaa, you will get something like:


Switch1: MAC aaaa.aaaa.aaaa

(*) Active, Vlan 300

Switch2: MAC aaaa.aaaa.aaaa

(*) Active, Vlan 300


However, i don't see on which interface the switch is forwarding.


On Switch1, when i disconnect the link in Po30, the "sh mac-address-table" looks still the same:


Switch1: MAC aaaa.aaaa.aaaa

(*) Active, Vlan 300

Switch2: MAC aaaa.aaaa.aaaa

(*) Active, Vlan 300


However, the switch is now forwarding the packets across the VSL. How can i see this ?


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didyap Wed, 11/12/2008 - 07:12
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You can use the command

show mac-address-table {address mac-addr} [all | {interface interface/switch-num//slot/port} | {switch num [module num]} | {vlan vlan-id}]


interface displays Optional) Displays information about a specific interface type; possible valid values are gigabitethernet and tengigabitethernet.


show mac-address-table vlan vlan-id [all | {switch num [module num]}

all displays every instance of the specified MAC address in the forwarding table.



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