[j-nsp] multicast questions

[Stacy W. Smith]

My first guess is that traffic is not making it on the RPT from the RP to the receiver's DR, and therefore the receiver's DR is not attempting to join the SPT.

Can you provide the output of "show multicast route extensive" at the RP and the receiver's DR?

As Nilesh suggested, this might also be due to the receiver's DR not having an RPF entry to the source. The output of "show multicast rpf <src>" on the receiver's DR would also be useful.

--Stacy



On Apr 19, 2010, at 6:02 PM, snort bsd wrote:

> Hi all:
> 
> I have an active multicast receiver looking for source 225.0.0.1:
> 
> -----------------------------------------------------
> user at hs3# run show pim join extensive
> Instance: PIM.master Family: INET
> 
> Group: 225.0.0.1
>    Source: *
>    RP: 10.100.3.4
>    Flags: sparse,rptree,wildcard
>    Upstream interface: so-0/1/0.0
>    Upstream neighbor: 10.100.2.10
>    Upstream state: Join to RP
>    Downstream neighbors:
>        Interface: fe-1/3/0.0
>            172.20.30.1 State: Join Flags: SRW  Timeout: Infinity
> 
>                                        <-------- Nothing here.
> 
> Instance: PIM.master Family: INET6
> ------------------------------------------------
> 
> from above data, it doesn't seem to find the source. but I took a look at RPS:
> 
> -----------------------------------------------------------
> user at RP# run show pim join extensive    
> Instance: PIM.master Family: INET
> 
> Group: 225.0.0.1
>    Source: *
>    RP: 10.100.3.4
>    Flags: sparse,rptree,wildcard
>    Upstream interface: Local                 
>    Upstream neighbor: Local
>    Upstream state: Local RP
>    Downstream neighbors:
>        Interface: so-0/1/1.0             
>            10.1000.2.9 State: Join Flags: SRW Timeout: 191
> 
> Group: 225.0.0.1
>    Source: 10.100.5.200
>    Flags: sparse,spt
>    Upstream interface: fe-0/0/2.0            
>    Upstream neighbor: 10.100.4.18
>    Upstream state: Local RP, Join to Source
>    Keepalive timeout: 32               <----- No downstream neighbor
> 
> Instance: PIM.master Family: INET6
> -----------------------------------------------------
> 
> It seems that RP knows the source of group 225.0.0.1 but somehow the source and receiver just won't connect. Somehow RP doesn't work?
> 
> here is the RP config:
> 
> user at RR# show protocols pim
> rp {
>    bootstrap-priority 10;
>    local {
>        address 10.100.3.4;
>    }
> }
> interface fe-0/0/0.0 {
>    mode sparse;
> }
> interface fe-0/0/1.0 {
>    mode sparse;
> }
> interface fe-0/0/2.0 {
>    mode sparse;
> }
> interface fe-0/0/3.0 {
>    mode sparse;
> }
> interface so-0/1/0.100 {
>    mode sparse;
> }
> interface so-0/1/1.0 {
>    mode sparse;
> }
> 
> 
> any ideas?