Re: how to forward multicast to second subnet

Discussion in 'Cisco' started by dave, Nov 3, 2003.

  1. dave

    dave Guest

    (Yeli Feng) wrote in message news:<>...
    > Hi,
    >
    > I am using two 3700 to multicast to 2 cascaded subnets as follows
    > 0/1 1/0 0/1 1/0
    > sender---------R1------------R2--------receiver2
    > |
    > |________receiver1
    >
    > Sender ip: 20.0.0.10, multicast address: 239.0.0.30, receiver1:
    > 20.1.0.10, receiver2: 20.2.0.10
    >
    > Configure on R1:
    > ip multicast-routing
    > interface Fastehternet0/1
    > ip address 20.0.0.1 255.255.255.248
    > ... ...
    > interface Fastethernet1/0
    > ip address 20.1.0.2 255.255.255.248
    > ip access-list lan10 in
    > ... ...
    > ip access-list extended lan10
    > permit igmp host 20.1.0.10 host 239.0.0.30
    > permit igmp host 20.1.0.3 host 239.0.0.30
    > ... ...
    >
    > Configure on R2:
    > ip multicast-routing
    > interface Fastehternet0/1
    > ip address 20.1.0.3 255.255.255.0
    > ... ...
    > interface Fastethernet1/0
    > ip address 20.2.0.4 255.255.255.0
    > ip access-list lan20 in
    > ... ...
    > ip access-list extended lan20
    > permit igmp 20.2.0.0 0.0.0.255 host 239.0.0.30
    > ... ...
    >
    >
    > So far receiver1 can receive multicast data, but can not see multicast
    > packet coming in R2 F0/1. I tried to add multicast help-mapper at R1,
    > can see packets coming in at R2 F0/1. But seems dropped. Add a static
    > mroute at R2 would help?
    >
    > Please help.
    >
    > Thank you very much in advance
    > Yeli



    U need to configure pim dense/sparse etc etc on the interfaces, also
    from router 2 I think u might need a route back to the sending server.
    dave, Nov 3, 2003
    #1
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  2. Dave,

    I would suggest you to read Routing TCP/IP 2.That way you will understand
    Multicast.

    Apparently what you are missing is Multicast routing protocol.

    Enable ip pim sparse-dense-mode on all your router interfaces.Then give it a
    try.

    Regds




    "dave" <> wrote in message
    news:...
    > (Yeli Feng) wrote in message

    news:<>...
    > > Hi,
    > >
    > > I am using two 3700 to multicast to 2 cascaded subnets as follows
    > > 0/1 1/0 0/1 1/0
    > > sender---------R1------------R2--------receiver2
    > > |
    > > |________receiver1
    > >
    > > Sender ip: 20.0.0.10, multicast address: 239.0.0.30, receiver1:
    > > 20.1.0.10, receiver2: 20.2.0.10
    > >
    > > Configure on R1:
    > > ip multicast-routing
    > > interface Fastehternet0/1
    > > ip address 20.0.0.1 255.255.255.248
    > > ... ...
    > > interface Fastethernet1/0
    > > ip address 20.1.0.2 255.255.255.248
    > > ip access-list lan10 in
    > > ... ...
    > > ip access-list extended lan10
    > > permit igmp host 20.1.0.10 host 239.0.0.30
    > > permit igmp host 20.1.0.3 host 239.0.0.30
    > > ... ...
    > >
    > > Configure on R2:
    > > ip multicast-routing
    > > interface Fastehternet0/1
    > > ip address 20.1.0.3 255.255.255.0
    > > ... ...
    > > interface Fastethernet1/0
    > > ip address 20.2.0.4 255.255.255.0
    > > ip access-list lan20 in
    > > ... ...
    > > ip access-list extended lan20
    > > permit igmp 20.2.0.0 0.0.0.255 host 239.0.0.30
    > > ... ...
    > >
    > >
    > > So far receiver1 can receive multicast data, but can not see multicast
    > > packet coming in R2 F0/1. I tried to add multicast help-mapper at R1,
    > > can see packets coming in at R2 F0/1. But seems dropped. Add a static
    > > mroute at R2 would help?
    > >
    > > Please help.
    > >
    > > Thank you very much in advance
    > > Yeli

    >
    >
    > U need to configure pim dense/sparse etc etc on the interfaces, also
    > from router 2 I think u might need a route back to the sending server.
    Tribavan Raina, Nov 6, 2003
    #2
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