From: srdja blagojevic (srdja1@pexim.co.yu)
Date: Sun Nov 26 2006 - 06:51:58 ART
Mohamed,
in the task 5.2 you set AutoRP for all groups => your groups will run in
sparse mode (ip pim sparse-dense mode mean: "if I have RP I will use sparse,
else I will use dense mode")
Since your groups are running in sparse mode you will need ip pim nbma-mode
in hub-and-spoke topology.
I also think that you need command ip igmp join-group 224.4.4.4 on R4 to
meet task requirement.
HTH,
Srdja
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mohamed Saeed
Sent: Sunday, November 26, 2006 10:36
To: ccielab@groupstudy.com
Subject: IEWB - Ver 3 - Lab 8 - Task 5.4 ( ip pim nbma-mode)
Hi All,
In that task, we have R1, R4 and R5 in hub and spoke setup with R1 as the
hub. PIM sparse-dense mode is running over the cloud. It is required that
the Ethernet interface of R4 to receive multicast feed from R5 Ethernet and
also to make R4 responds to ICMP ping to 224.4.4.4 group.
First, I though there will be an issue with RPF and also I though I should
use the "ip igmp" command to R4 to allow it responding to ICMP ping. What I
found in the solution guide is that the only configuration done is enabling
the "ip pim nbma-mode" command under the hub physical interface.
As I know, that command is used to send multicast feed ONLY to the DLCIs
that have multicast receivers in sparse mode. I wonder what that command is
supposed do in this setup. Also do not we need to enforce R4 Ethernet
interface to join the 224.4.4.4 group? Hope if someone could help with that.
Kind Regards
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