MSDP session source IP and RP

[sarahr202]

Hi everyone.

Please consider the following example:

(LO:1.1.1.1 )R1-12.12.12.1---12.12.12.2 R2 (LO:2.2.2.2)

Above we are setting MSDP session between R1 and R2. This is what I see:

Case 1:

R1 has a loopback0 : 1.1.1.1/32

ip pim rp-address 1.1.1.1

ip msdp peer 2.2.2.2

I see :

 R1 will not initiate TCP session for MSDP

Case2:

R1 has a loopback0 : 1.1.1.1/32

ip pim rp-address 1.1.1.1

ip msdp peer 2.2.2.2 connect-source loopback 0

I see:

R1  initiates TCP session for MSDP.

That tells me MSDP session SRC IP must be same as  RP's address on R1

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is it normal behavior or am I seeing GNS3 bug?

Additional info:

RFC 3618 does not say anything about SOURCE IP of MSDP session should be same as RP's IP address on the originating peer.

R1#show version
Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M), Version 15.2(4)S3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport

Thanks and have a nice weekend!!

[Reza Sharifi · Accepted solution]

Hi Sarah,

Long time no see here.

As long as the source is a loopback address but I don't think the source has to be the RP's IP address.

R1 has a loopback0 : 1.1.1.1/32

ip pim rp-address 1.1.1.1

ip msdp peer 2.2.2.2 connect-source loopback 1 (3.3.3.3)

interface loopback1

ip address 3.3.3.3

HTH

[sarahr202]

Thanks Reza, nice to hear from you old friend:)