All things related to multicast

["Marshall Eubanks" <>]

>On Thu, Aug 16, 2001 at 11:45:09PM -0400, Michael H. Lambert wrote:
>> Any suggestions as to what the following might mean (Cisco 7507 w/IOS 
>> 12.1(5)T9)?  The immediate upstream router is a Juniper, but RPF checks 

>> done by hand look correct.

Dear Michael;

Remember, MSDP RPF is always to MSDP _peers_ - never to sources directly.

You can do 
show ip msdp sum  

- see if 144.228.240.249 is an msdp peer -
 if not, make it so, and see 
if that fixes things

if it is, do a
show ip rpf 144.228.240.249
you should see
RPF type: mbgp

If it says "unicast" I would add a static mbgp route to this RP. Unicast RPF
routes to
MSDP peers are supposed to work, but we have had rpf troubles with this.

If it says something else, I would change your mbgp peering or add a static
mbgp route
to make it say mbgp.

You can verify by doing
show ip mbgp 144.228.240.249
and making sure the route exists.

Let me know if this fixes things.

Marshall 
>
>"show ip rpf" in Cisco IOS shows you the RPF check applied to multicast
>packets received by a router. That's not the same as the MSDP RPF check,
>and no, there's no "show ip mdsp rpf" *sigh*.
>
>What the debug below shows is that you got the SA from 192.88.115.101
>(should be the juniper, right ?) for RP 144.228.240.249. The RPF
>failure indicates that the best route in the MBGP routing table for the
>RP address 144.228.240.249 is this router (0.0.0.0) itself.
>
>What's you MSDP/MBGP topology ? Are the RP and juniper part of your AS ?
>
>Cheers
>
>       Toerless
>
>> Thanks,
>> 
>> Michael
>> 
>> Aug 16 14:52:08.541 EDT: MSDP: 192.88.115.101: Received 44-byte msg 2743222

>> from peer
>> Aug 16 14:52:08.541 EDT: MSDP: 192.88.115.101: SA TLV, len: 44, ec: 3, RP:

>> 144.228.240.249
>> Aug 16 14:52:08.541 EDT: MSDP: 192.88.115.101: Peer RPF check failed for

>> 144.228.240.249, used IMBGP route's peer 0.0.0.0
>> 
>> +-----------------------------------------------------------------------+

>> | Michael H. Lambert, Network Engineer           Phone: +1 412 268-4960 |

>> | Pittsburgh Supercomputing Center               FAX:   +1 412 268-8200 |

>> | 4400 Fifth Avenue, Pittsburgh, PA  15213       
>> 
>>         |

>> +-----------------------------------------------------------------------+

>
>

Marshall Eubanks