[c-nsp] Same MAC on different VLAN

[Keegan Holley]

Your phone is trunking and it is in both vlans at the same time.  Any device capable of dot1q tagging packets can appear in multiple vlans.  When that happens it doesn't change it's mac and this is the result.  

Sent from my iPhone

On Mar 4, 2011, at 5:57 PM, Leslie Meade <lmeade at signal.ca> wrote:

> Ok my switching understanding is fairly limited..
> 
> But can anyone shed some light on the following for me
> 
> 
> 
> K-SW-02#sh mac address-table  | inc Fa0/8
> 
> 172    000b.5ff9.3071    DYNAMIC     Fa0/8 à IP phone
> 
>  26    000b.5ff9.3071    DYNAMIC     Fa0/8 àip phone
> 
>  26    e0cb.4e68.bbfd    DYNAMIC     Fa0/8
> 
> 
> 
> Why would I get the same mac address on two different vlans ?
> 
> 
> 
> 
> 
> interface FastEthernet0/8
> 
> switchport access vlan 26
> 
> switchport mode access
> 
> switchport voice vlan 172
> 
> srr-queue bandwidth share 1 70 25 5
> 
> srr-queue bandwidth shape 3 3 0 0
> 
> priority-queue out
> 
> spanning-tree portfast
> 
> spanning-tree bpduguard enable
> 
> service-policy input QOS-POLICY
> 
> end
> 
> 
> 
> 
> 
> Cheers
> 
> 
> 
> Leslie
> 
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