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RE: mroute posted 09/14/2007
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You need add another mroute at R7 for multicast source RPF check.

In your mail, you said "In the routing table on R7 is R5 the next hop to reach to R4 R2 and R1", so when multicast stream coming down to R7, R7 sees the source is from R6 instead of R5, RPF check fails.



Best Regards,
Net (Xin) He

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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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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