[Xorp-users] Question regarding PIM-SM

[Jigar]

Hi all,

I want to test the following scenario given in RFC-4601 (PIM-SM) in
section 3.3 ( Phase Three: Shortest Path Tree ):
##############################################################
To obtain lower latencies or more efficient bandwidth utilization,
a router on the receiver's LAN, typically the DR, may *optionally* initiate
a transfer from the shared tree to a source specific shortest path tree 
(SPT).
To do this, it issues an (S,G) Join towards S.
##############################################################

I have tested this scenario with XORP and I found that XORP does not 
initiate
this step.

To test this particular initiation, I have following setup:
Please find the setup which is attached.

Test Setup details:
- XORP PIM-SM is enabled on the RUT. The RP is statically configured
for 224.0.6.130.
- The RUT is the DR for network 0.
- RUT has a static route to the RP through TR2.
- The RUT has a static route to the source through TR1.

Steps followed:
1. On networks 2, TR1 and TR2 transmit Hello messages.
2. On network 0, transmit IGMP reports for 224.0.6.130.
3. On network 1, the RP will transmit the data packets.
4. The multicast destination address of the data is 224.0.6.130.
5. TR2 will forward the data packets on to network 2.

Expectations:
- As expected, RUT forwards multicast data packets from network 2 to 
network 0.
- As mentioned in statements in RFC, RUT may issue an (S,G) Join towards 
source.
But I did not find any (S,G) Join on network 2.

I want to know whether XORP supports the feature of creating Shortest 
Path Tree
or not. If XORP initiates this step then please tell me where I am going 
wrong.

Regards,
Jigar Jajal
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