[Xorp-users] cand-rp without BSR

Pavlin Radoslavov pavlin at ICSI.Berkeley.EDU
Sun Feb 22 12:23:20 PST 2009


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

> On Fri, Feb 20, 2009 at 07:51:56PM +0100, Carsten Otto wrote:
> > 	static-rps {
> > 		rp 134.130.56.193 {
> > 			group-prefix 239.254.1.0/24 {
> > 				rp-priority 255
> > 			}
> > 			group-prefix 239.254.2.0/24 {
> > 				rp-priority 255
> > 			}
> > 		}
> > 		rp 137.226.39.194 {
> > 			group-prefix 239.254.18.0/24 {
> > 				rp-priority 0
> > 			}
> > 		}
> > 		rp 137.226.119.114 {
> > 			group-prefix 239.254.16.0/24 {
> > 				rp-priority 0
> > 			}
> > 			group-prefix 239.254.17.0/24 {
> > 				rp-priority 0
> > 			}
> > 		}
> > 	}
> 
> (Sorry for the spam, I need more coffee)
> 
> To clarify: 137.226.119.114 is my XORP. The static-rp section of
> 137.226.56.193 looks the same, but streaming from my network to that
> network does not work. The XORP at 137.226.39.194 is still using a
> BSR-nonstatic-configuration and does serve data to 137.226.56.193 (and
> my network).

In general, all PIM-SM routers (i.e., not only the RPs) in the
domain must have same Cand-RP set so they can map to the exactly
same RP for each group.
In your setup, all your XORP PIM-SM routers must have exactly same
cand-rps setup so they all will know that multicast to 239.254.1.0/24
and 239.254.2.0/24 must go to RP 134.130.56.193.
The "show pim rps" CLI command should show same result for all
routers.

In your setup you are using different RPs for different multicast
group prefixes, so you need to debug the issue(s) per group
prefix. E.g., multicast to 239.254.1.0/24 or 239.254.2.0/24 will
behave differently from multicast to 239.254.18.0/24 or to
the (239.254.16.0/24, 239.254.17.0/24) prefixes.

The "show pim join" command in the XORP routers directly connected
to the sender(s) for those groups must show the (S,G) entry for the
sender/group and the RP must be 134.130.56.193.
If the entry is correct, then (depends on other factors), the
source's data packets are either unicast (encapsulated in PIM
Registers) to the RP, or are forwarded natively (on the (S,G)
entries) directly toward the receivers.
If in doubt, please send the output form "show pim join" from the
PIM-SM Designated Router for the subnet with the sender (whose
traffic is suppose to go to 137.226.56.193).

Regards,
Pavlin



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