05-05-2003 08:03 PM - edited 03-02-2019 07:08 AM
hub and spoke
r1
| |
r2 r3
the frame-relay interface of the three routers are in one subnet
frame-relay map with broadcast
pim dense-mode
r2's ethernet interface join one multicast group:239.1.1.1
r1 can ping this multicast address,but r3 can not.
what's the problem?
05-06-2003 12:00 AM
Can you post the configs ?
05-06-2003 05:39 AM
r1(hub)
int s0
ip add 10.10.1.1 255.255.0.0
encapsulation fram-relay
ip pim dense-mode
r2(spoke)
int s0
ip add 10.10.1.2 255.255.0.0
ip pim dense-mode
encapsulation frame-relay
int e0
ip add 10.100.1.2 255.255.255.0
ip pim dense-mode
ip igmp join-group 239.1.1.1
r3(spoke)
int s0
ip add 10.10.1.3 255.255.0.0
encapsulation fram-relay
ip pim dense-mode
05-06-2003 08:39 AM
Since this is a hub and spoke you would have yo add the ip pim nbma-mode
05-06-2003 06:24 PM
it doesn't work
05-09-2003 11:55 PM
When a multicast packet arrives on r1, it creates (*,G) state containing all interfaces that possibliy need to forward traffic (PIM neighbours, IGMP groups). To actually forward traffic, (S,G) state is set up. The incoming interface is the one, where the packet is received from, the OIL contains the rest of the interfaces from (*,G).
Sinde the frame relay interface is the incoming interface, your packet is not forwarded out of this interface again and therefore does not get from r2 to r3.
NBMA mode does not help either, because it can only collect the additional information form SM joins
The most effective solution is to use subinterfaces.
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