On Mon, Oct 8, 2012 at 2:27 PM, John Neiberger <jneiber...@gmail.com> wrote: > We have a simple setup like this: > > [receiver] ---- [ Cisco-rtr-A] ---- [ Cisco rtr-B] ----- [MX960] ----- > [Cisco rtr-C] ---- [source] > > The receiver has joined a specific S,G, but this is very low rate, > perhaps just a couple of multicast packets per week. It's a multicast > messaging setup related to emergency alerts. What's weird is that if > you look at the multicast routing tables on the Cisco routers, the S,G > will be there. However, the multicast route is not present on the > Juniper router. It does show up under "show pim join", but there is no > route. The odd behavior we're seeing is that the first message from > source to receiver is always dropped. If we configure the source to > send multiple times, the first one fails but all subsequent messages > succeed. Our thought is that the multicast route is timing out on the > MX 960, so the first packet gets dropped, although it apparently > causes the route to be setup again since the rest of the packets > succeed. > > Any idea if we're on the right track? It seems like we're just running > into some sort of timeout issue on this router, but we're not sure > yet. > > Thanks, > John
I just ran across this configurable timeout value that I think might be relevant. It looks like the max is 12 hours, so if this is the right "knob", I don't think even maxing it out is going to help in our situation. timeout (Multicast) Syntax timeout minutes; Hierarchy Level [edit logical-routers logical-router-name routing-instances routing-instance-name routing-options multicast forwarding-cache], [edit logical-routers logical-router-name routing-options multicast forwarding-cache], [edit routing-instances routing-instance-name routing-options multicast forwarding-cache], [edit routing-options multicast forwarding-cache] Release Information Statement introduced in JUNOS Release 8.2. Description Configure the timeout value for multicast forwarding cache entries. Options minutes—Length of time that the forwarding cache limit remains active. Range: 1 through 720 _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp