[rbridge] Consensus Check: Announcing Root
Eastlake III Donald-LDE008
Donald.Eastlake at motorola.com
Sat Oct 6 12:46:16 PDT 2007
This is a check via the mailing list on a slight modification of an
apparent consensus from the minutes of the Chicago meeting for a change
from protocol draft -05. The tentative consensus at the Chicago meeting
It is mandatory for an RBridge to announce the bridge root that
it sees out each physical port.
Based on mailing list discussion, I would like to tweak this as follows:
An Rbridge MUST parse BPDUs it receives on a port and announce
in the core IS-IS instance the bridge root that it sees out
each port. For MSTP (Multiple Spanning Tree Protocol), this is
the CIST (Common and Internal Spanning Tree) root.
I have a question in connection with this. What is announced for the
port if no BPDU has been received recently or ever? Should there be a
"root MAC address valid" flag per port or should there some conventional
value, like zero, which is announced?
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