From: Josef A (josefnet@gmail.com)
Date: Tue Dec 19 2006 - 09:00:12 ART
Tunnel between between R4 and R3 ?
thx
On 12/19/06, Koen Zeilstra <koen@koenzeilstra.com> wrote:
>
> Hey group,
>
> Imagine the following scenario:
>
> |--R1--|
> HOSTA---R4------| |----R3---HOSTB
> |--R2--|
>
>
> On the hostA subnet HSRP runs with virt. ip 192.168.1.3.
>
> R1 f0/0: 192.168.1.1 HSRP prio 120
> R2 f0/0: 192.168.1.2 HSRP prio 110
>
> Host B sends multicast to group 239.1.1.1.
>
> R4 does a RPF check on the mcast packets which are sourced from R1 f0/0
> (192.168.1.1). The RPF check fails because the unicast route to R3 is via
> the HSRP virt. ip address 192.168.1.3.
>
> How is this solved?
>
> 1. We can use static mroutes on R4 pointing to R1, this will work however
> there is no failover for multicast as there is for unicast traffic. The
> mroute will not dissapear because if R1 fails the ethernet interface on R4
> will still be up and running. If R4 f0/0 fails there is no connectivity
> towards R2 anyways...
>
> 2. I can imagine a PBR routing scenario where all traffic from R1 and R2
> towards R4 is sourced from the HSRP virt. ip address? Not nice, since this
> will cause all traffic to be process switched.
>
> Any nice solutions anybody?
>
> all help appreciated!
>
> thanks,
>
> Koen
>
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