All things related to multicast

[Bill Nickless <>]

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With the recent MSDP storms from RAMEN, I've seen discussion on this email 
list and others about disabling MSDP for the time being.

Please remember that an BGP NLRI=Multicast advertisement is a statement of 
reachability.

If you turn off your MSDP session with a peer or upstream network, but 
don't turn off BGP NLRI=Multicast route advertisements at the same time, 
you are advertising reachability that does not exist.

This is the multicast equivalent of making a unicast black-hole-style false 
announcement.  Obviously a Bad Thing(tm).
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Bill Nickless    http://www.mcs.anl.gov/people/nickless      +1 630 252 7390
PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7     


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