Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

Understanding Provider Bridge Participation in RSTP or MSTP Instances

 

A provider network can bridge the customer STP BPDU packets between customer sites by default. At the same time, the provider network can prevent forwarding loops by running a spanning-tree protocol in the provider network. On an MX Series router running Rapid Spanning-Tree Protocol (RSTP) or Multiple Spanning-Tree Protocol (MSTP) in a provider network, you can enable provider bridge participation in the RSTP or MSTP instance.

The IEEE 802.1ad specification reserves the group MAC address value of 01:80:c2:00:00:08 to designate the provider bridge group. On an MX Series router for which you have enabled provider bridge participation in the RSTP or MSTP instance, the router exchanges BPDU packets with the provider bridge group as follows:

  • Transmitted BPDU packets contain the destination MAC address 01:80:c2:00:00:08.

  • Received BPDU packets with the destination MAC address 01:80:c2:00:00:08 are accepted and passed to the Routing Engine.