Re: Peering VLANs and MAC addresses

["Stephen J. Wilcox" <steve () telecomplete co uk>]

Hi Simon,

so you have:

IX---SwitchA---SwitchB---Router

why not disable spanning tree? There is no redundancy here anyway so disable it 
in that particular VLAN.

Steve


On Wed, 9 Nov 2005, Simon Brilus wrote:

> Hi ,
>
> We are unable to resolve a problem with our peering exchange connection and 
> would like any assistance.  Our peering setup is a follows:
>
> - Our peering exchange connection goes into switch A
> - Switch A has a dark fibre connection to switch B, which is in a different 
> PoP
> - Our peering router is connected to switch B
>
> We use spanning tree across our network to allow the VLANs connectivity 
> across our network.
>
> The peering exchange has an MoU that only 1 MAC address should be visible on 
> their switch.  However they see 2 MAC addresses on our port.
>
> - MAC address of Peering router
> - MAC address of the port they are connected to on switch A
>
> Is there any way to prevent switch A from presenting the interface MAC 
> address?  Or is this a symptom of spanning tree that cannot be stopped?
>
> Your input will be most welcome.
>
> The config on switch A is as follows:
>
> interface GigabitEthernet0/5
>  description Peering Link
>  switchport access vlan 148
>  switchport mode access
>  speed nonegotiate
>  storm-control broadcast level 5.00
>  no cdp enable
>  spanning-tree portfast
>  spanning-tree bpdufilter enable
>  spanning-tree guard root
>
> Regards
>
> Simon Brilus