From: Sameh El Tawil (eltawil@free.fr)
Date: Sat Nov 13 2004 - 04:48:22 GMT-3
Hi Andy,
Thanks for the example. I'll give it a try in the lab and see how it goes.
Actually what I was looking for is: once we have SSM how does the signalling
work to achieve reachability?
----- Original Message -----
From: "Edwards, Andrew M" <andrew.m.edwards@boeing.com>
To: "Sameh El Tawil" <eltawil@free.fr>; <ccielab@groupstudy.com>
Sent: Friday, November 12, 2004 8:48 PM
Subject: RE: SSM resources
> 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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