From: "Alt, Ryan" <ryan.alt@xxxxxxxxxx>
Reply-To: "Alt, Ryan" <ryan.alt@xxxxxxxxxx>
To: <robert.steeneken@xxxxxxxxxxxxx>, <ccielab@xxxxxxxxxxxxxx>
Subject: RE: mroute
Date: Fri, 14 Sep 2007 16:46:23 -0500
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FILETIME=[85DC0DB0:01C7F71A]
The first solution that comes to mind is a GRE tunnel, but I'm not sure
exactly why it doesn't work. That's an interesting problem...
________________________________
From: nobody@xxxxxxxxxxxxxx on behalf of robert.steeneken@xxxxxxxxxxxxx
Sent: Fri 9/14/2007 3:23 PM
To: ccielab@xxxxxxxxxxxxxx
Subject: mroute
A question about mroute on a lan. I have the following situation.
R1
|
R2 (RP)
|
R4
/ \
/ \
R5 R6
__|______|__
|
R7
On R5 is multicast not enabled.
In the routing table on R7 is R5 the next hop to reach to R4 R2 and R1
So on R7 the rpf check fails, when I add the next mroute
*, 224.2.2.2), 00:13:55/00:02:56, RP 140.40.2.2, flags: SCL
Incoming interface: FastEthernet0.56, RPF nbr 140.40.56.5
Outgoing interface list:
Loopback0, Forward/Sparse, 00:13:55/00:02:56
R7(config)#ip mroute 140.40.2.2 255.255.255.255 140.40.56.6
(*, 224.2.2.2), 00:00:02/00:02:57, RP 140.40.2.2, flags: SCL
Incoming interface: FastEthernet0.56, RPF nbr 140.40.56.5, Mroute
Outgoing interface list:
Loopback0, Forward/Sparse, 00:00:02/00:02:57
A ping to 224.2.2.2 (both loopbacks on R6 and R7 have a igmp join) only
shows a result for R6 and not R7
But when i divide the lan between R5 R6 R7 in two seperated vlans and I
change the mroute
ip mroute 140.40.2.2 255.255.255.255 140.40.76.6
(*, 224.2.2.2), 00:01:04/00:02:59, RP 140.40.2.2, flags: SCL
Incoming interface: FastEthernet0.76, RPF nbr 140.40.76.6, Mroute
Outgoing interface list:
Loopback0, Forward/Sparse, 00:01:04/00:02:25
Now the RPF check don't fails and a ping to 224.2.2.2 works.
What did I wrong in the first situation? Or how could I have fixed the RPF
with a mroute.
Robert.
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