Peering VLANs and MAC addresses

["Simon Brilus" <sbrillus () blueyonder co uk>]

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