From: Adarsh Singh (adarshs@hclinfinet.net)
Date: Wed Dec 18 2002 - 13:29:09 GMT-3
Hi Tim ,
Thanks for the reply , I am still very confused on the same , let me =
tell you my doubt.
MServer--E0--(router1)--se0--------se0(router2)---se1(multiples gre =
tunnels on serial1)----Service provider Cloud--------Se0(gre =
tunnel)(Router3)--e0---Receiver.
Now I making loopback interface in router 2 as RP(rendezvous point).=20
Mserver sends udp multicast specifically on 239.255.255.255.
So we have STP( shortest transfer path) between router 1 & router 2.
Router 2 has multiple gre tunnels on serial 1 connected to Service =
provider cloud, which terminates at router 3 where we have the receiver =
.
All the E0, Se0 on router 1 & se0,Se1 on router 2 is running ip pim =
sparse-mode as well as Se0 & E0 of the router 3.
So router 2 should replicate the 239.255.255.255 multicast receiving on =
se 0 & Send it through various gre tunnels.
Now the traffic between Router 1 & router 2 should not increase it =
should remain constant , but the traffic between se1(router2) & Serial 1 =
of Service provider end would increase,as you said the encapsulation of =
the packets is taking place at router 2.
Am I correct in stating the above statement.
Pls do let me know.
Rgds
Adarsh Singh=20
---- Original Message -----=20
From: "Tim Fletcher" <tim@fletchmail.net>
To: "Adarsh Singh" <adarshs@hclinfinet.net>; "Joe Chang" =
<changjoe@earthlink.net>; <ccielab@groupstudy.com>
Sent: Wednesday, December 18, 2002 8:59 PM
Subject: Re: Multicast ISSUE=20
> Adash,
>=20
> In order to get any bandwidth reduction benefit from multicast, you =
have to=20
> have a shared media. Tunnels are (virtual) point to point media. The =
router=20
> will do the replication, but it will then have to encapsulate each =
packet=20
> in each tunnel and send them separately. There is no way to send a =
packet=20
> through tunnel 1 and have it arrive at destination 2.
>=20
> -Tim Fletcher
>=20
> At 10:45 AM 12/18/2002 +0530, Adarsh Singh wrote:
> >Hi Joe ,
> >
> >Yes the scenario is as you have described the source is multicast =
server on
> >LAN & the receivers are through tunnel from router 1, is there a =
way I can
> >decrease the traffic at the serial interface when both receivers are =
using
> >the multicast traffic , I am expecting router 1 to do the replication =
of the
> >traffic going tunnels, which is not happening , since the traffic on =
the
> >serial keeps increasing as I increase the number tunnels, is there a =
way
> >around to keep the traffic between the Router to Router1 constant to =
the
> >multicast traffic , inspite of adding number of tunnels.
> >
> >
> >Rgds
> >Adarsh
> >----- Original Message -----
> >From: "Joe Chang" <changjoe@earthlink.net>
> >To: <ccielab@groupstudy.com>
> >Sent: Tuesday, December 17, 2002 11:34 PM
> >Subject: Re: Multicast ISSUE
> >
> >
> > > 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
> > > > .
> > > .
> >.
>=20
.
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