All things related to multicast

[Leonard Giuliano <>]

On Wed, 5 Feb 2003, Michael H. Lambert wrote:

-) A call for help...
-)
-) I'm trying to get multicast "to work" on with a host directly attached to a
-) fast ethernet port on a Juniper M40 running JUNOS 5.6R1.3.  The host is
-) running Windows XP Professional.
-)
-) I'll just focus on the beacon group, 233.2.171.1.  The host IP is
-) 192.88.115.114.
-)
-) In our "default" configuration, "show multicast route group 233.2.171.1"
-) shows this (S,G) in a pruned state.  If I add static igmp group membership
-) for 233.2.171.1 to the interface, I now see the (S,G) in a forwarding
-) state.  However, our upstream 12008 does not see an mroute entry for the
-) (S,G).  The host does show up on the beacon page as receiving other beacons
-) (but nothing hears it).  The RPF checks are as they should be (some manual
-) configuration was necessary, or at least sufficient).
-)

So it's receiving, but not sending?  You shouldn't need static joins to
receive, so I would look at that first.  Without the static IGMP
configured, does the router see the IGMP reports ('show igmp group')?
Also, can you send a 'show pim join extensive'.  BTW, the JUNOS equivalent
command of IOS' 'show ip mroute' is 'show pim join extensive'.  'Show
multicast route' in JUNOS is not very useful.

As far as the sending part, is this M40 first hop router also acting as
the RP?  If so, does it create an MSDP SA, and do it's peers receive it?
If not, is there register state on the RP?


-) My first hunch is that MSDP is not announcing the (S,G) from the Juniper to
-) the Cisco.  Does this sound plausible, and, if so, how do I fix it?  And is
-) there some magic configuration piece I'm missing?  I don't like the idea of
-) having to do static configuration.
-)

Are you in Miami now?  If so, let's talk.  Otherwise, you can contact me
directly if you prefer.


-Lenny