From: Edwards, Andrew M (andrew.m.edwards@boeing.com)
Date: Fri Nov 12 2004 - 16:48:31 GMT-3
Its on the doc cd... Seems that using the ip pim ssm <default> or range
<group-list> carves these addresses out as being SSM only -> no RP.
For simplicity, assume full reachability in this scenario by IGPS. So
to start:
Example: R1-----R2
R1
Ip multicast-routing
Int e0
Ip add 1.1.1.1 255.255.255.0
Ip pim sparse-dense
Int lo0
Ip add 1.1.2.1 255.255.255.255
Ip pim sparse-dense
Int lo100
Ip add 1.1.2.2 255.255.255.255
Ip igmp join 232.1.1.1
Ip pim send-rp-announce lo0 scope 5
Ip pim send-rp-discovery lo0 scope 5
----------
R2
Ip multicast-routing
Int e0
Ip add 1.1.1.2 255.255.255.0
Ip pim sparse-dense
Int lo0
Ip add 1.1.2.3 255.255.255.255
Ip igmp join 232.1.1.1
On R2, if you do "show ip pim rp map" you see 1.1.1.1 is RP for all
groups 224.0.0.0/8
Now, on R2, do a "show ip mroute" will indicate dense mode groups
(1.1.1.1, 224.0.1.39) and (1.1.1.1, 224.0.1.40); And (*,232.1.1.1) as
sparse mode group.
Then..... Turn on SSM.
On R2 and R1:
Ip pim ssm default
Then... On either router ping 232.1.1.1, wait for response, and do "show
ip mroute"
You will see the (S,G) for the two nodes (1.1.2.3, 232.1.1.1) as SSM
(e.g. s flag set). Note, they are no longer using sparse mode RP.
Here's a link on DocCD
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fipr_c/ipcpt3/1cfssm.htm
HTH
andy
-----Original Message-----
From: Sameh El Tawil [mailto:eltawil@free.fr]
Sent: Friday, November 12, 2004 8:55 AM
To: ccielab@groupstudy.com
Subject: SSM resources
Hi,
I have been unable to find any URL or document explaining how PIM SSM
should work!! All the documents I found on cisco.com concentrate on the
IGMP3/IGMP v3lite/ URD side of the story. SSM appears on the lab exam
blueprint so I assume we are expected to have sound knowledge of the
protocol.
The URLs I found explain that it is an extension of PIM-SM (not DM),
still it will not use the RPT. I am looking for any document that
describes how traffic from the source manages to be distributed to the
receivers.
Any help will be appreciated,
Sameh
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