All things related to multicast

[Gordon Rogier <>]

I am a little confused about something.  When I look at the msdp sa-cache
I see several (s,g) with more than one rp and related mbgp/as being
distributed.  eg. group 224.2.236.80 below (arbitrary choice of (s,g)
here).  Is this just misconfigured rps in the 1741 and/or 2603, or is it
some other senario?  I also appears to me that 145 may be redistributing
or some sort of msdp "proxy" agent?

>From a quick read of the msdp draft, I wonder which if not all of these
rps a downnstream rp would elect to initiate an (s,g) join toward?

This is not causing a problem (at least not for me currently).  I am just
grasping to understand how and what msdp will do.

thanks in advance for any insights from the group.

Gordon.

>sh ip msdp sa-cache 224.2.236.80

MSDP Source-Active Cache - 8123 entries
(193.166.1.118, 224.2.236.80), RP 193.166.5.252, MBGP/AS 1741, 2d01h/00:05:07
(193.166.1.118, 224.2.236.80), RP 193.10.252.5, MBGP/AS 2603, 2d16h/00:05:17
(193.166.5.252, 224.2.236.80), RP 193.166.5.252, MBGP/AS 1741, 2d02h/00:05:07
(193.166.5.252, 224.2.236.80), RP 193.10.252.5, MBGP/AS 2603, 2d16h/00:05:17
(158.36.16.180, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
00:10:59/00:05:02
(158.36.16.180, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 02:09:46/00:04:16
(158.36.33.16, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 01:09:45/00:05:16
(128.182.61.166, 224.2.236.80), RP 128.182.13.11, MBGP/AS 5050, 1d19h/00:05:54
(128.197.25.51, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 1d22h/00:05:02
(128.197.25.96, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 1d22h/00:05:02
(128.197.160.165, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
1d22h/00:05:02
(166.45.2.31, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 1d22h/00:05:02
(192.87.109.49, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
00:03:58/00:05:02
(192.87.109.49, 224.2.236.80), RP 145.41.1.81, MBGP/AS 1103, 19:20:23/00:05:04
(128.197.160.62, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
1d21h/00:05:02
(133.11.64.185, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 1d19h/00:05:02
(128.32.239.57, 224.2.236.80), RP 128.32.0.224, MBGP/AS 25, 21:53:47/00:04:37
(128.138.213.5, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 1d13h/00:05:02
(128.39.7.3, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 00:00:57/00:05:02
(128.39.7.3, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 02:20:46/00:02:16
(198.10.80.1, 224.2.236.80), RP 198.10.80.1, MBGP/AS 24, 1d03h/00:05:53
(158.38.60.79, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
00:06:58/00:05:02
(158.38.60.79, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 02:37:46/00:05:16
(158.38.60.80, 224.2.236.80), RP 204.147.128.141, MBGP/AS 145, 
00:05:58/00:00:01
(158.38.60.80, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 02:24:46/00:05:16
(158.36.33.54, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 00:59:44/00:04:16
(158.36.51.55, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 00:59:44/00:04:16
(128.39.7.2, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 00:11:44/00:05:16
(129.241.100.134, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 
00:11:44/00:05:16
(158.36.33.48, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 00:18:44/00:05:16
(158.36.33.35, 224.2.236.80), RP 128.39.0.85, MBGP/AS 224, 00:12:44/00:04:15

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Gordon Rogier                        

            
Network Engineer                     785-864-0381wk 785-550-4468 cell
Great Plains Network                 785-864-9330 FAX