From: Salman Abbas (dukelondon@gmail.com)
Date: Sun Nov 26 2006 - 10:04:29 ART
Hi guys,
Let me tell you my observation. I found out that after using the command "ip
igmp join group 224.4.4.4" on vlan 4 interface on R4, i could ping
224.4.4.4from R1 but not from R5. Then I configured the command "ip
pim nbma-mode" on
R1 and magically I was able to ping the group from R5. Now this is in sharp
contrast with the documentation of the ip pim nbma-mode command on the Cisco
website. First of all, its not recommended for sparse-dense mode but rather
for sparse-mode only. Secondly, its not a command that is meant to be put on
the hub router's interface everytime we want to ping from one spoke, a group
that is on another spoke. What do you guys say????
Regards,
Salman
On 11/26/06, srdja blagojevic <srdja1@pexim.co.yu> wrote:
>
> Mohamed,
>
> There are 2 things that I can remember on the top of my head right now:
>
> - RPF check failure; there are redundant paths between R4 and R5: vlan 45
> and FR cloud. Check out your routing between R4 and R5. You can test this
> by
> shutting down vlan 45 on both routers.
>
> - task requirement asks that ping should be generated from vlan 52, so you
> should use extended ping on R5 with source interface in vlan 52 for task
> requirement testing.
>
>
> hth,
> Srdja
>
> -----Original Message-----
> From: Mohamed Saeed [mailto:mohamed_saeed2@rayacorp.com]
> Sent: Sunday, November 26, 2006 11:32
> To: srdja blagojevic; ccielab@groupstudy.com
> Subject: RE: IEWB - Ver 3 - Lab 8 - Task 5.4 ( ip pim nbma-mode)
>
> Hi Srdja,
>
> Thanks for your clarification regarding the sparse-dense mode issue.
>
> Although I have configured the "ip pim nbma-mode" I could not ping
> 224.4.4.4 from R5. However, I could ping it from R1. Below are the mroute
> of
> both R1 and R5, Appreciate if you could shed some light to any thing I may
> miss:
>
> R1#sh ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C -
> Connected,
> L - Local, P - Pruned, R - RP-bit set, F - Register flag,
> T - SPT-bit set, J - Join SPT, M - MSDP created entry,
> X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
> U - URD, I - Received Source Specific Host Report, Z - Multicast
> Tunnel
> Y - Joined MDT-data group, y - Sending to MDT-data group Outgoing
> interface flags: H - Hardware switched
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 224.4.4.4), 00:00:08/stopped, RP 0.0.0.0, flags: D
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/1, Forward/Sparse-Dense, 00:00:08/00:00:00
> Serial0/0, Forward/Sparse-Dense, 00:00:08/00:00:00
>
> (174.1.145.5, 224.4.4.4), 00:00:08/00:02:57, flags: PT
> Incoming interface: Serial0/0, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/1, Prune/Sparse-Dense, 00:00:08/00:02:51
>
> (*, 224.0.1.39), 01:20:43/stopped, RP 0.0.0.0, flags: D
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/0, Forward/Sparse-Dense, 01:20:21/00:00:00
> Serial0/1, Forward/Sparse-Dense, 01:20:43/00:00:00
>
> (150.1.1.1, 224.0.1.39), 01:20:43/00:02:13, flags: T
> Incoming interface: Loopback0, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/0, Prune/Sparse-Dense, 00:06:41/00:02:13
> Serial0/1, Forward/Sparse-Dense, 01:20:43/00:00:00
>
> (*, 224.0.1.40), 01:20:47/stopped, RP 0.0.0.0, flags: DCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/0, Forward/Sparse-Dense, 01:20:21/00:00:00
> Serial0/1, Forward/Sparse-Dense, 01:20:46/00:00:00
> Loopback0, Forward/Sparse-Dense, 01:20:47/00:00:00
>
> (150.1.3.3, 224.0.1.40), 01:19:45/00:02:47, flags: LT
> Incoming interface: Serial0/1, RPF nbr 174.1.13.3
> Outgoing interface list:
> Loopback0, Forward/Sparse-Dense, 01:19:45/00:00:00
> Serial0/0, Forward/Sparse-Dense, 01:19:45/00:00:00
>
> R1# ping 224.4.4.4
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.4.4.4, timeout is 2 seconds:
>
> Reply to request 0 from 174.1.145.4, 76 ms Reply to request 0 from
> 174.1.145.4, 132 ms
>
>
>
> R5#sh ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C -
> Connected,
> L - Local, P - Pruned, R - RP-bit set, F - Register flag,
> T - SPT-bit set, J - Join SPT, M - MSDP created entry,
> X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
> U - URD, I - Received Source Specific Host Report,
> Z - Multicast Tunnel, z - MDT-data group sender,
> Y - Joined MDT-data group, y - Sending to MDT-data group Outgoing
> interface flags: H - Hardware switched, A - Assert winner
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 224.4.4.4), 00:00:16/stopped, RP 0.0.0.0, flags: D
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/2/0, Forward/Sparse-Dense, 00:00:16/00:00:00
>
> (150.1.1.1, 224.4.4.4), 00:00:16/00:02:43, flags: PT
> Incoming interface: Serial0/2/0, RPF nbr 174.1.145.1
> Outgoing interface list: Null
>
> (174.1.145.1, 224.4.4.4), 00:00:16/00:02:43, flags: PT
> Incoming interface: Serial0/2/0, RPF nbr 0.0.0.0
> Outgoing interface list: Null
>
> (*, 224.0.1.39), 01:20:07/stopped, RP 0.0.0.0, flags: D
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/2/0, Forward/Sparse-Dense, 01:20:07/00:00:00
>
> (150.1.1.1, 224.0.1.39), 00:01:07/00:01:52, flags: PT
> Incoming interface: Serial0/2/0, RPF nbr 174.1.145.1
> Outgoing interface list: Null
>
> (*, 224.0.1.40), 01:22:03/stopped, RP 0.0.0.0, flags: DCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/2/0, Forward/Sparse-Dense, 01:22:03/00:00:00
>
> (150.1.3.3, 224.0.1.40), 01:20:07/00:02:21, flags: PLTX
> Incoming interface: Serial0/2/0, RPF nbr 174.1.145.1
> Outgoing interface list: Null
>
> Kind Regards
> Mohamed ...
>
> -----Original Message-----
> From: srdja blagojevic [mailto:srdja1@pexim.co.yu]
> Sent: Sunday, November 26, 2006 11:52 AM
> To: Mohamed Saeed; ccielab@groupstudy.com
> Subject: RE: IEWB - Ver 3 - Lab 8 - Task 5.4 ( ip pim nbma-mode)
>
>
> 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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