RE: RPF Failures

Hey,

Further check the RPF at R6 too for source , It should be via R1. Perhaps
unicast routing points towards the interface connecting to SW1. so try add
Mroute at R6 to overcome the RPF failure. Hope it works.

> Date: Sat, 6 Mar 2010 06:11:49 +0100
> Subject: Re: RPF Failures
> From: okebobola_at_gmail.com
> To: natetlee_at_gmail.com
> CC: ccielab_at_groupstudy.com
>
> hey Nate, you could try to point to an outgoing interface instead of a
> next-hop in your mroute statement
> let's see...
>
> On Sat, Mar 6, 2010 at 5:46 AM, Nate Lee <natetlee_at_gmail.com> wrote:
>
> > I'm having a problem with RPF failures that I can't seem to override with
> > an
> > MRoute.
> >
> > I have SW1<Ethernet>R3 <Serial-Frame> R5<Serial-Frame>R1<Ethernet>R6
> >
> > R6 also connects back SW1 (acting as L3 router). Neither of SW1's
> > interfaces facing R3 or R6 are running PIM, but it is running OSPF. This
> > non
> > PIM path is the lowest cost from R3 to R6's Loopback which is sourcing
the
> > multicast traffic.
> >
> > I created a static mroute on R3 pointing to R5 but for some reason, it
> > still
> > shows its ethernet connection to SW1 as the RPF to R6's Loopback.
> >
> > I should point out that R3 and R5 are not PIM neighbors as R3 is acting
as
> > an igmp-helper for SW1 who's interface facing R3 is using the IGMP
> > join-group command that R3 forwards to R5. R3 has dense mode on both its
> > serial and ethernet interfaces.
> >
> > My Mpacket debug from R3 where it is being dropped:
> >
> > *Mar 6 05:57:38.900: IP(0): s=150.1.6.6 (Serial0/1/0) d=239.1.1.100 id=0,
> > ttl=251, prot=17, len=48(44), not RPF interface-if)
> >
> >
> > Rack1R3(config-if)#do sh ip mroute 239.1.1.100
> >
> >
> > <Omitted>
> >
> >
> >
> > (*, 239.1.1.100), 00:57:13/stopped, RP 150.1.8.8, flags: SJCL
> >
> > Incoming interface: Serial0/1/0, RPF nbr 155.1.0.5, Mroute <<<<This is
> > the serial link facing R5 that the packets from R6's loopback come in on
> >
> > Outgoing interface list:
> >
> > FastEthernet0/0, Forward/Dense, 00:57:13/00:00:00
> >
> >
> >
> > (150.1.6.6, 239.1.1.100), 00:01:00/00:01:59, flags: LJT
> >
> > Incoming interface: FastEthernet0/0, RPF nbr 155.1.37.7 <<<<<<This is the
> > ethernet side of R3 facing SW1
> >
> > Outgoing interface list:
> >
> > Serial0/1/0, Forward/Dense, 00:01:01/00:00:00, A
> >
> >
> >
> >
> > Rack1R3(config-if)#do sh ip rpf 150.1.6.6
> >
> > RPF information for ? (150.1.6.6)
> >
> > RPF interface: FastEthernet0/0
> >
> > RPF neighbor: ? (155.1.37.7) <<<<<<This is SW1 acting as a L3 router
> > between R3 and R6
> >
> > RPF route/mask: 150.1.6.0/24
> >
> > RPF type: unicast (ospf 1)
> >
> > RPF recursion count: 0
> >
> > Doing distance-preferred lookups across tables
> >
> > Multicast Multipath enabled
> >
> >
> > Rack1R3(config-if)#do sh run | in mroute
> >
> > no ip mroute-cache
> >
> > ip mroute 150.1.6.6 255.255.255.255 150.1.0.5 <<<<This is R5's serial
> > interface facing R3's Serial 0/1/0
> >
> >
> >
> > After 2 hours on this one, I've gotta throw in the towel and ask for
help.
> > Can anybody point me in the right direction?
> >
> > Thanks!
> >
> > Nate
> >
> >
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>
>
> --
> Bobola Oke
>
>
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Received on Sat Mar 06 2010 - 12:41:16 ART