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MSDP SA message and Dircetly connected source

Hi everyone

 

I would like to hear your thoughts;
Please consider the example below:


  Lo:1.1.1.1 S1-10.10.10.1----10.2.2.2 R2(rp)<----MSDP----->R3(rp)----->R4 -Listener 235.1.1.1 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 235.1.1.1, R2 sends SA ( 10.10.10.1, 235.1.1.1) to R3 via MSDP.
2) If S1 sends multicast with SRC IP 1.1.1.1, dst 235.1.1.1, R2 does not send SA for 1.1.1.1, 235.1.1.1, there is no RPF issue, both R2/R3 knows 1.1.1.1 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 1.1.1.1

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)

 

 

Thanks and have a nice weekend!!

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