From: Jian Gu (guxiaojian@gmail.com)
Date: Thu Nov 16 2006 - 23:41:26 ART
1) router will do RPF check for each multicast packet, irrelavent whether it
is PIM sparse or dense.
2) you have "ip igmp join-group" configured, which will make the router
behave like a host, once a multicast packet is received it will be consumed
by CPU.
On 11/16/06, Michael Zuo <mzuo@ixiacom.com> wrote:
>
> 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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This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:47 ART