[86524] in North American Network Operators' Group
Peering VLANs and MAC addresses
daemon@ATHENA.MIT.EDU (Simon Brilus)
Wed Nov 9 05:40:39 2005
From: "Simon Brilus" <sbrillus@blueyonder.co.uk>
To: <nanog@merit.edu>
Date: Wed, 9 Nov 2005 10:39:50 -0000
Errors-To: owner-nanog@merit.edu
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
