Re: Register message source Ip address?

From: Bob Sinclair (bsinclair@netmasterclass.net)
Date: Mon Jan 23 2006 - 15:51:47 GMT-3


Gustavo,

Interesting question. I do not see the specific answer in Williamson or in
the PIM-SM RFC 2362. By experiment: I am seeing the outgoing interface as the
source ip in the register packet (the interface closest to the RP), not the ip
address connected to the multicast server.

HTH,

Bob Sinclair
CCIE #10427, CCSI 30427
www.netmasterclass.net

  ----- Original Message -----
  From: Gustavo Novais
  To: ccielab@groupstudy.com
  Sent: Monday, January 23, 2006 1:03 PM
  Subject: Register message source Ip address?

  Hi guys,

  I have one doubt concerning PIM sparse mode and source registering
  process.

  Imagine that we have two routers (7600) in order to provide redundancy
  in all the segments that they are connected.

  We have a multicast source on vlan 20 and a third router acting as RP on
  vlan 899. The DR router for vlan 20 will be responsible for generating
  the register messages towards the RP while the RP itself does not join a
  SPT to the source.

  What will be the IP address on the Register messages sent by the DR of
  vlan 20? Will it be the nearest IP to the RP (i.e. vlan 899 IP) or the
  IP of the interface nearest to the source (to which the router is
  actually the DR)?

  I have no lab to try this out at the moment...

  Any thoughts?

  TIA

  Gustavo Novais

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