[86525] in North American Network Operators' Group
RE: Peering VLANs and MAC addresses
daemon@ATHENA.MIT.EDU (Ben Butler)
Wed Nov 9 05:50:28 2005
Date: Wed, 9 Nov 2005 10:50:16 -0000
From: "Ben Butler" <ben.butler@c2internet.net>
To: "Simon Brilus" <sbrillus@blueyonder.co.uk>, <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
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Hi,
This should sort you out.
no keepalive
spanning-tree bpdufilter enable
Kind Regards
Ben
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Simon Brilus
Sent: 09 November 2005 10:40
To: nanog@merit.edu
Subject: Peering VLANs and MAC addresses
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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
