[Xorp-users] multicast questions!

[G.T. Chiang]

Dear Pavlin

    thakn you so much!! we had contacted the university netwokr people and 
didi some configuration. it seem now we can see neighbors. and internal 
mlticast seems wokr fine. we can see our machines from beacon. the attached 
file is some tests using xorpsh. however, we try to connect to Access Grid 
venue server, we still can not see other people login from other network. 
is there any standard procedure we can make sure our multicast is wokring 
propertly?

Best Regard!
    mike

On Jan 29 2006, Pavlin Radoslavov wrote:

>>    we are tring to make our network multicast working. we had test 
>> using mtrace, and seems the problme seems happend at our gateway 
>> machine. this is our architecture.
>
>FYI, currently XORP doesn't support the IGMP extentions necessary
>for mtrace, so mtrace won't be a reliable mechanism to debug the
>problem.
>
>> sender machine---gateway (two interfaces)---university router----
>> 
>> we are running xorp at gateway machines. however, when i run show pim 
>> neighbors, it is empty. it seems the router can not find next hop:( any 
>> one
>
>It is odd that "show pim neighbors" doesn't find the university
>router as a neighbor, so you need to solve that problem first.
>If you run tcpdump on your gateway (on the interface that connects
>it to the university router), do you see the PIM Hello packets?
>Could be simply that the university router is not configured to run
>PIM on that particular subnet?
>If you don't see the PIM Hello packets then double-check with your
>network admin that PIM is enabled on that interface. Note that the
>university router must be running PIM-SMv2; PIM-SMv1 is not
>compatible with PIM-SMv2 (for example, if I remember correctly, the
>PIM-SMv1 control messages are embedded inside IGMP messages, while
>PIM-SMv2 control messages have their own protocol number 103).
>
>> can give us any suggestion? the folloiwng is our xorp configuration 
>> file. we do not rellay know whihc RP have to use, it should be the 
>> closese one to our gateway? or we should to ask university netwokr 
>> people? BTW, it seems the unicast and multicast when we run traceroute, 
>> it is using different router just outside our network, will that be a 
>> problme?
>
>Your RP-set must be same as the RP-set of the university network, so
>you must ask the netadmin folks about that.
>If the university network uses a set of static RPs to configure the
>RP-set, then you must use the same static RP-set in your
>configuration and you should disable the PIM Bootstrap config.
>
>If the university network is using the Bootstrap mechanism to
>propagate the RP-set, then you disable the static RPs config, but
>you should enable the bootstrap in your config. Furthermore, it
>would be safer if you comment-out the cand-bsr and cand-rp setup.
>
>Apart of that your config looks fine, though in any case you must
>solve first the neighborhood problem before solving the RP-set
>problem.
>
>Pavlin
>