Multicast

From: Ahmed Mustafa (ahmed.mustafa@sbcglobal.net)
Date: Fri Feb 27 2004 - 02:49:53 GMT-3


Can someone explain the meaning of the output below. As soon as I configured
r2 as an RP with loopback 0 interface. I understand little about (*,
224.0.1.39) and (*,224.0.1.40) as the multicast address for announce and
discovery methods, but why in the middle it is using loopback as a source with
224.0.0.39.

Thanks

Rack1R2#show ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.39), 00:00:45/00:02:59, RP 0.0.0.0, flags: D
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial0, Forward/Sparse-Dense, 00:00:45/00:00:00
    Ethernet0, Forward/Sparse-Dense, 00:00:45/00:00:00

(150.1.2.2, 224.0.1.39), 00:00:45/00:02:14, flags: PT
  Incoming interface: Loopback0, RPF nbr 0.0.0.0
  Outgoing interface list:
    Ethernet0, Prune/Sparse-Dense, 00:00:39/00:02:20
    Serial0, Prune/Sparse-Dense, 00:00:35/00:02:24

(*, 224.0.1.40), 00:08:11/00:00:00, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial0, Forward/Sparse-Dense, 00:08:33/00:00:00
    Ethernet0, Forward/Sparse-Dense, 00:08:39/00:00:00



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