All things related to multicast

[Bill Nickless <>]

> > > I'm trying to troubleshoot a problem and need to determine if a MSDP
> peer is
> > > sending SA's for a particular (S,G).  It doesn't appear I can do this 
> with
> > > Cisco's detailed MSDP debugging.

Create a specific entry in your MSDP access-list.  Here's the one I used to 
see if I was sending out MSDP SAs for hosts in a particular LIS:

Extended IP access list 111
    deny ip any host 224.0.2.2 (6344 matches)
    deny ip any host 224.0.1.3
    deny ip any host 224.0.1.24 (20618 matches)
    deny ip any host 224.0.1.22 (18719 matches)
    deny ip any host 224.0.1.2 (108663 matches)
    deny ip any host 224.0.1.35 (13028 matches)
    deny ip any host 224.0.1.60 (2284 matches)
    deny ip any host 224.0.1.39
    deny ip any host 224.0.1.40
    deny ip any 239.0.0.0 0.255.255.255 (4596 matches)
    deny ip 10.0.0.0 0.255.255.255 any
    deny ip 127.0.0.0 0.255.255.255 any
    deny ip 172.16.0.0 0.15.255.255 any
    deny ip 192.168.0.0 0.0.255.255 any
    permit ip 130.202.0.0 0.0.255.255 any (344 matches)
    permit ip 140.221.0.0 0.0.127.255 any (579928 matches)
    permit ip 141.221.0.0 0.0.255.255 any (80 matches)
    permit ip 146.137.0.0 0.0.255.255 any (13715 matches)
    permit ip 146.139.0.0 0.0.255.255 any (63628 matches)
    permit ip 164.54.0.0 0.0.255.255 any (604 matches)
    permit ip 192.5.170.0 0.0.1.255 any (585 matches)
    permit ip 192.5.180.0 0.0.0.255 any
    permit ip 192.5.186.0 0.0.0.255 any
    permit ip 192.5.192.0 0.0.0.255 any
    permit ip 192.5.195.0 0.0.0.255 any
    permit ip 192.5.197.0 0.0.0.255 any
    permit ip 192.5.198.0 0.0.0.255 any
    permit ip 192.5.199.0 0.0.0.255 any
    permit ip 192.5.200.0 0.0.0.255 any
    permit ip 192.5.201.0 0.0.0.255 any
    permit ip 192.131.121.0 0.0.0.255 any
    deny ip any any (10031351 matches)


As you can see, the access list will show you a counter increment for when 
a matching (S,G) goes through.  You can put a more specific match earlier 
in the access list than a more general match to see specific cases like 
this.  This technique works for both incoming and outgoing MSDP access lists.

(PS: how can I get on the wg-multicast email list?)
===
Bill Nickless    http://www.mcs.anl.gov/people/nickless      +1 630 252 7390
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