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Strange MSDP scenario, every 99th ping is good
By the way if R7 and R8 are PIM neighbors, the ping works great. I guess I should be asking this:
Are R7 and R8 required to be PIM neighbors or is there another way around it?
I thought the R1 sending the MSDP message to R8, would populate R8’s OIL, but it appears not…
On Tue, Sep 30, 2008 at 9:17 PM, Hobbs wrote:
> Here is my scenarion, SW4 is attempting to ping group joined by BB1: > > multicast domain 1 multicast domain 2: > [BB1—>R1—>R5—>R7] — [R8—SW3—SW4] > > R1 is the RP for domain 1. > R8 is the RP for domain 2. > R1 and R8 are MSDP peers and the peer connections are UP: > > BB1 is joined to group 225.0.0.25 > SW4 is the sender to 225.0.0.25. > > R7 and R8 are PIM enabled on their connected interfaces but are NOT PIM > neighbors. Otherwise, it would be one big domain. > > I’m gonna spoil my last mail by showing every 99th ping is successful: > > Cat3560-4#ping 225.0.0.25 re 1000 > > Type escape sequence to abort. > Sending 1000, 100-byte ICMP Echos to 225.0.0.25, timeout is 2 seconds: > ………………………………………………………… > Reply to request 66 from 100.100.100.100, 17 > ms……………………………………………………………………………… > Reply to request 157 from 100.100.100.100, 17 > ms……………………………………………………………………………… > Reply to request 248 from 100.100.100.100, 17 > ms……………………………………………………………………………… > Reply to request 339 from 100.100.100.100, 16 > ms……………………………………………………………………………… > Reply to request 430 from 100.100.100.100, 16 > ms……………………………………………………………………………… > Reply to request 521 from 100.100.100.100, 17 > ms…………………………………. > > I have noticed the mroute entry on R8 is timing out. 150.100.34.14 is the > address of SW4’s sending interface. > > R8#show ip mroute 225.0.0.25 | Beg * > (*, 225.0.0.25), 00:18:09/stopped, RP 200.0.0.8, flags: SP > Incoming interface: Null, RPF nbr 0.0.0.0 > Outgoing interface list: Null > > (150.100.34.14, 225.0.0.25), 00:02:56/00:00:03, flags: PA > Incoming interface: FastEthernet0/1, RPF nbr 150.100.81.13 > Outgoing interface list: Null > > When this entry times out, I switch to SW4 and the ping is good one time > only. Then the entry is populated again immediately and the OIL becomes > NULL. I turned off SPT switchover on all routers with “ip pim spt-threshold > infinity” > > Any ideas? > > thanks,
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