North American Network Operators Group

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Peering VLANs and MAC addresses

  • From: Simon Brilus
  • Date: Wed Nov 09 05:41:16 2005

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


Simon Brilus