From: zhangxianqi (xianqizhang@xxxxxxxx)
Date: Sat Dec 16 2000 - 03:55:02 GMT-3
thanks Menga,according your say,then r2 can ping mulitcast group in r1 (traffi
ce directed to the r1's port) and r1 can ping multicast group on r2 too (becaus
e switch flood the ping to all port),but one of my friend tell me when he try i
t,the r1 can't ping the group on r2,I have no cat to test it,i think maybe when
cat open cgmp,and when the ping traffic to a group it find no cgmp registratio
n for,it will not flood to all port.am I right?not sure.
Regards
xianqi
----- Original Message -----
From: Justin Menga <Justin.Menga@computerland.co.nz>
To: 'zhangxianqi' <xianqizhang@sina.com>; <ccielab@groupstudy.com>
Sent: Friday, December 15, 2000 6:21 PM
Subject: RE: cgmp question
> If CGMP is not configured on the router, then the router will not generate
> CGMP messages which inform switches running CGMP which hosts are part of a
> multicast group.
>
> All this means is that multicasts will be flooded to all ports in the vlan -
> if CGMP was enabled on both ends, then the switch would learn which ports to
> constrain the multicasts to.
>
> You could also enable IGMP snooping on the switch, switch will then listen
> to IGMP messages and learn this way.
>
> -----Original Message-----
> From: zhangxianqi [mailto:xianqizhang@sina.com]
> Sent: Friday, December 15, 2000 6:04 PM
> To: ccielab@groupstudy.com
> Subject: cgmp question
>
>
> hi,
> if the switch have cgmp open,but a router have not open the cgmp,the router
> can still receive and send multicast?because no switch,could you try it and
> tell me the answer?
>
> ------(e1)r1(e0)-----------cat--------------(e0)r2(e1)----------
> r1: int e 1
> ip add 10.0.1.1 255.255.255.0
> ip pim dense-mode
> ip igmp join-group 239.1.1.1
> int e 0
> ip add 20.0.1.1 255.255.255.0
> ip pim dense-mode
> ip cgmp enable
>
> cat : set cgmp enable
>
> r2: int e 0
> ip add 20.0.1.2 255.255.255.0
> ip pim dense-mode ----------------------->>but r2 have not open cgmp
> int e 1
> ip add 30.0.1.1 255.255.255.0
> ip pim dense-mode
> ip igmp join-group 239.2.2.2
> the igp between r1 and r2 is any,so r1 and r2 have all the route.
>
> question: can r2 ping 239.1.1.1? can r1 ping 239.2.2.2?
>
> TIA
>
> Regards
> xianqi
>
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