[f-nsp] Odd MRP problem

George B. georgeb at gmail.com
Sat Sep 11 15:02:03 EDT 2010


See this diagram for reference:

http://tinypic.com/r/kb93lj/7

This is pretty simple.  I have one vlan in an MRP ring through 4 MLX units.
I configure the master, and it works as expected.  I then configure the
members.  The problem is when the last "member" (non-master) is configured
in the ring, the master begins to receive thousands of RHP and TC RBPDUs per
second.  It doesn't matter which one is the last member configured but as
soon as I enable RHP on that last member, the count of RHP and TC RBPDUs
goes haywire.  Here is what my master currently shows:

RHPs sent            RHPs rcvd            TC RBPDUs rcvd
509883               4193162              3684318

As you can see, it has sent about a half a million RHPs but received over 4
million of them!

Only one unit is configured as "master".  As long as I have MRP unconfigured
on one of the members, the ring works as expected. There is no spanning tree
of any sort running on that vlan.  I am just in awe of how RHP packets can
seemingly be created in the network somewhere at such an amazing rate!

Anyone else seen anything like this?  It is just plain wacky!

George
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