I would like to hear your thoughts; Please consider the example below:
Lo:22.214.171.124 S1-10.10.10.1----10.2.2.2 R2(rp)<----MSDP----->R3(rp)----->R4 -Listener 126.96.36.199 H
S1: Source R2:RP R3:Rp
Assume everything is correctly configured.
This is what I see:
1) If S1 sends multicast with SRC IP 10.10.10.1 , dst 188.8.131.52, R2 sends SA ( 10.10.10.1, 184.108.40.206) to R3 via MSDP. 2) If S1 sends multicast with SRC IP 220.127.116.11, dst 18.104.22.168, R2 does not send SA for 22.214.171.124, 126.96.36.199, there is no RPF issue, both R2/R3 knows 188.8.131.52 via RPF interface.
When I look at RFC 3618 it does not say anything how the R2 should behave if it receives a multicast stream directly i.e from the attached source but SRC IP is not within subnet used between SRC and R2. In our case this is 10.10.10.0/24 but SRC IP in the stream is 184.108.40.206
I see different behavior:
Some old IOS just ignores it, some initiates SA.
IOS that ignores it:
#show version ( emulated GNS3) Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 15.2(4)S5,
Cisco C870 ( not emulated) Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(24)T8, RELEASE SOFTWARE (fc1)
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