RE: pim-sm router transitions from DR to non-DR
2007-05-09 06:14:26 GMT
Transition [J] state => [NJ] state ; Send respective Prune message viz. (*,G) or (S,G); Cancel respective Join Timer
Note: JoinDesired(*,G), depends on pim_include(*,G) which in turn depends on "I_am_DR( I )" bool.
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Sent: Friday, April 27, 2007 12:40 AM
To: Satyanarayana Dillikar
Cc: pim <at> ietf.org; Binu TN
Subject: Re: [pim] pim-sm router transitions from DR to non-DR
I have a basic doubt in the pim-sm router transition from DR to non-DR. Let's assume a scenario where a sm router (e.g., RT1) is DR in a LAN and it has multicast route entry and it is trigerring Join messages to RP (it is in some other network) as it has some interesting hosts. If another sm router ( e.g.RT2) with higher IP address comes into the LAN of RT1, as per my understanding RT2 will become DR and RT1 will become non-DR to that LAN. My doubts are,
1) whether the multicast route entries that are present in RT1 before entry of RT2 will be removed?
[dsatya] Not necessarily, those entries will changed based on the unicast route change to RP. (due to insertion of RT2)
2) Will RT1 stops trigerring Join messages to RP? Or RT1 will be trigerring Join messages for existing entries and RT2 will be trigerring for any new entries?
[dsatya] RT1 should not trigger Join Msgs to RP and RT2 should take up the job.
Please clear my doubts.
Thank you in advance.
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