From: Joe Chang (changjoe@earthlink.net)
Date: Tue Dec 17 2002 - 15:04:10 GMT-3
It seems that you have enabled pim on the physical interfaces between all
the routers, as well as between the tunnel endpoints (assuming the tunnels
for R2 and R3 end at the multicast server.) When the network first starts up
the leaf routers will have to choose whether to use its tunnel or physical
interface as its RPF interface for group 239.255.255.255. Since the tunnel
is only one hop back to the source, the prune will be requested for the
physical interface. The server router will then prune its serial interface
from its oil list, and have to send out one multicast packet for each
tunnel, thereby doubling the traffic.
----- Original Message -----
From: "Adarsh Singh" <adarshs@hclinfinet.net>
To: "Don" <seadon@attbi.com>; "Sean Garrett" <SGarrett@cnitech.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, December 17, 2002 1:40 AM
Subject: Multicast ISSUE
> Hi Don,
>
> I have this typical problem with multicast :
>
> Multicast Server(router)----LL(64Kbps)----Router 1-----tunne1 ----R2(each
> tunnel traffic is 20 Kbps)
>
> ------tunnel2 ---R3
>
>
> Now as the number of tunnels(gre) increases at the router 1 , the traffic
> increases propotinally for the 64 Kbps leased line .
> So the mulicast is not taking place in real sense .
>
>
>
> The commands used at tunnel are as follows :
>
> interface Tunnel2
> ip address 172.168.12.1 255.255.255.252
> ip directed-broadcast
> ip pim sparse-dense-mode
> ip igmp join-group 239.255.255.255
> load-interval 30
> tunnel source 10.65.12.233
> tunnel destination 10.74.5.9
>
> interface FastEthernet0
> description connected to EthernetLAN
> ip address 192.168.10.85 255.255.255.0 secondary
> ip directed-broadcast
> ip pim sparse-dense-mode
> ip igmp join-group 239.255.255.255
> load-interval 30
> speed auto
> half-duplex
>
>
> interface Serial1
> description connected to infinet for VPN
> ip address 10.65.7.82 255.255.255.252
> ip accounting output-packets
> ip pim sparse-dense-mode
> ip igmp join-group 239.255.255.255
> load-interval 30
>
>
> Do let me know if someone has ideas of where i an making a mistake.
>
>
> Rgds
> Adarsh Singh
> .
.
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