mroute needed for dense mode?

From: Michael Zuo (mzuo@ixiacom.com)
Date: Thu Nov 16 2006 - 23:01:57 ART


Hi Group,

I have a couple of possible stupid questions: if I have:

       R1--------------------------------------------------------R2

e0/1 e0/0 150.1.12.x/24 e0/0 e0/1

R1:

interface Tunnel0

 ip address 10.0.0.1 255.0.0.0

 ip pim dense-mode

 tunnel source Ethernet0/0

 tunnel destination 150.1.12.2

!

interface Ethernet0/0

 ip address 150.1.12.1 255.255.255.0

!

interface Ethernet0/1

 ip address 150.1.14.1 255.255.255.0

 ip pim dense-mode

 ip igmp join-group 239.1.1.1

R2:

interface Tunnel0

 ip address 10.0.0.2 255.0.0.0

 ip pim dense-mode

 tunnel source Ethernet0/0

 tunnel destination 150.1.12.1

!

interface Ethernet0/0

 ip address 150.1.12.2 255.255.255.0

!

interface Ethernet0/1

 ip address 150.1.23.2 255.255.255.0

 ip pim dense-mode

Rack1R2(config-if)#do ping 239.1.1.1 source e0/1

Type escape sequence to abort.

Sending 1, 100-byte ICMP Echos to 239.1.1.1, timeout is 2 seconds:

Packet sent with a source address of 150.1.23.2

Reply to request 0 from 10.0.0.1, 108 ms

My questions are:

1. for R1's e0/1 to talk to R2's e0/1 via multicast dense mode, do I
need "ip mroute 0.0.0.0 0.0.0.0 tunnel 0" configured on both routers?
(ie, does dense mode do RPF checks. In my mind, it should not because
the router should just forward dense mode packets to all the interfaces
that it did not come in on)

2. how come 10.0.0.1 is responding but not e0/1 on R1?

Thanks for your help...



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