From: Goh, Winston (winston.goh@xxxxxxxxxxxxx)
Date: Wed Jun 07 2000 - 23:34:54 GMT-3
Hi,
i tried this scenario out before :
r1-----Frame relay------r2
|
|
r3
configuring igmp join on r1 and r2 ethernet interfaces. Running ip pim
sparse on all routers, the non-broadcast nature of Frame-relay hinder r1 to
ping r2 multicast address and vice versa. Since r3 is the hub router,
configure ip pim nbma-mode and configure rp-address (r1). with this, i
manage to ping from spoke to spoke.
Alternatively, i tried ip pim sparse-dense mode without any ip pim nbma-mode
configuration. This seems to solve the problem as well. cheers
p/s : but i do notice that sometime i need to ping to the interface address
first before my multicast ping can get through.
Winston Goh
CCNP, CVE
Snr Network Specialist
Unisys Singapore
mobile : 97469192
-----Original Message-----
From: xuping [mailto:cnmiecxu@public.bta.net.cn]
Sent: Tuesday, June 06, 2000 6:09 PM
To: ccielab@groupstudy.com
Subject: multicast on nbma network
Hi
This question puzzle me for a long time.
Multicast routing is base on a tree (source tree or share tree), it meams
that a multicast router will not send out a multicast packet to an interface
on which it receive this packet. On a non-full mesh hub-spoke nbma network,
however, the hub router need send out multicast packet from one spoke to an
other. Without using sub-interface, the spoke router will only seen the hub
router as pim neighbor, the spoke to spoke neighbor relation will not
established.
Can I force the hub router relay the multicast packet from spoke1 to spoke2
just like a "no ip split-horizon"?
I check "ip pim nbma-mode" on DocCD, but it can't help.
If you read here, Thank you,
If you can give me a light, Thank you vvvvvery much!
xuping
cnmiecxu@public.bta.net.cn
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