From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Oct 26 2003 - 16:27:54 GMT-3
Hi Brian,
You raised an interesting issue I had never thought about before - that of
the rpf check failing when source is on a spoke of a multipoint interface.
In general, is there good way of handling such situations? And, are such
situations handled differently for F/R vs ATM?
Thanks, dt
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "'Hunt Lee'" <hunt_lee@bigpond.net.au>; <ccielab@groupstudy.com>
Sent: Sunday, October 26, 2003 2:13 PM
Subject: RE: multicast issues
> Hunt,
>
> I'm assuming that you're trying to create two point to point
> subnets by using GRE tunneling? What does your unicast routing table
> look like? Without seeing your complete config, I'm going to guess that
> you're still getting an RPF failure on your hub router. The point of
> creating two p2p subnets is to avoid the situation when your incoming
> interface and outgoing interface for the multicast feed are the same
> interface. You can think of this kind of a like split-horizon for
> multicast. Paste your unicast and multicast routing tables.
>
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 708-362-1418 (Outside the US and Canada)
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Hunt Lee
> > Sent: Saturday, October 25, 2003 9:35 PM
> > To: ccielab@groupstudy.com
> > Subject: multicast issues
> >
> > Is there a big secret to this?
> >
> > I have:
> > R1 (spoke) R2 (spoke)
> > \ /
> > R3 (hub - multipoint subinterface)
> >
> > My R3 is MA.
> >
> > R1 is Auto-RP for 225.1.1.1
> >
> > R2 is Auto-RP for 235.1.1.1
> >
> > Yet R1 can't ping R2's 235.1.1.1, nor vice versa... But R3 can ping
> both
> > 225.1.1.1 & 235.1.1.1 fine...
> >
> > R1
> >
> > interface Tunnel0
> > ip unnumbered Loopback0
> > ip pim sparse-dense-mode
> > tunnel source Loopback0
> > tunnel destination 192.1.1.1
> >
> > interface Serial0
> > ip address 10.1.1.1 255.255.255.0
> > ip pim sparse-dense-mode
> >
> > !
> > router ospf 1
> > passive-interface Tunnel0
> >
> > ip pim send-rp-announce Loopback0 scope 5 group-list rp-1
> > !
> > !
> > ip access-list standard rp-1
> > permit host 225.1.1.1
> > !
> >
> > R2
> >
> > interface Tunnel0
> > ip unnumbered Loopback0
> > ip pim sparse-dense-mode
> > tunnel source Loopback0
> > tunnel destination 192.2.2.2
> >
> > interface Serial0
> > ip address 10.2.2.2 255.255.255.0
> > ip pim sparse-dense-mode
> >
> > router ospf 1
> > passive-interface Tunnel0
> >
> > ip pim send-rp-announce Loopback0 scope 5 group-list rp-2
> > !
> > !
> > ip access-list standard rp-2
> > permit host 235.1.1.1
> >
> > R5
> >
> > !
> > interface Serial0.1 multipoint
> > ip address 10.5.5.5 255.255.255.0
> > ip pim sparse-dense-mode
> >
> >
> > interface Tunnel0
> > ip unnumbered Loopback0
> > ip pim sparse-dense-mode
> > tunnel source Loopback0
> > tunnel destination 10.1.1.1
> > !
> > interface Tunnel1
> > ip unnumbered Loopback0
> > ip pim sparse-dense-mode
> > tunnel source Loopback0
> > tunnel destination 10.2.2.2
> >
> > ip pim send-rp-discovery Loopback0 scope 5
> >
> > Thanks,
> > H.
> >
> >
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