[86531] in North American Network Operators' Group
Re: Peering VLANs and MAC addresses
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Wed Nov 9 16:05:00 2005
Date: Wed, 9 Nov 2005 21:04:33 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Simon Brilus <sbrillus@blueyonder.co.uk>
Cc: nanog@merit.edu
In-Reply-To: <002301c5e519$ea8428c0$132e010a@SimonPC>
Errors-To: owner-nanog@merit.edu
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
>
>
