[Xorp-users] Cand-RP is ignored

[Pavlin Radoslavov]

Carsten Otto <c-otto at gmx.de> wrote:

> On Wed, May 24, 2006 at 06:37:13PM -0700, Pavlin Radoslavov wrote:
> > Yes, I believe this is the issue. Previously, the first interface
> > that is UP was used to originate the Cand-RP-Adv message to the BSR.
> > There is no strong justification about this particular choice, so I
> > just committed some changes to CVS to use instead the RPF interface
> > toward the BSR.
> 
> I updated and now packets are sent:
> 
> 13:08:12.783037 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF], proto: PIM (103), length: 46, options ( RA (148) len 4 )) 137.226.119.114 > 188.1.42.50: PIMv2, length: 22
>         Candidate RP Advertisement prefix-cnt=1 prio=0 holdtime=2m30s RP=137.226.119.114 Group0=239.254.16.0/24
> 13:08:12.785113 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF], proto: PIM (103), length: 46, options ( RA (148) len 4 )) 137.226.119.114 > 188.1.42.50: PIMv2, length: 22
>         Candidate RP Advertisement prefix-cnt=1 prio=0 holdtime=2m30s RP=137.226.119.114 Group0=239.255.255.255
> 
> They are ignored, though.

Could you double-check that the other XORP routers on campus see the
same BSR. Another thing you could check is whether the BSR accepts
the particular group prefixes you are using: those particular values
belong to the Site-Local Scope, and the BSR may restrict their usage
(see http://www.iana.org/assignments/multicast-addresses).

If other XORP routers can successfully announce your multicast block,
but the BSR is still ignoring your Cand-RP-Advertisements, then
probably it has been configured to accept or drop the Cand-RP-Adv
messages from particular addresses? You would need to confirm that
with the netadmin for the BSR.

Pavlin