From: ??? (seajay76@nate.com)
Date: Fri Jan 06 2006 - 15:30:26 GMT-3
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Little mistake...
Disregard the previous mail, and please read this one.
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Dear members;
While I was studying about multicast helper-map,
I found a lot of differences between the Cisco Univercd and the Cisco Press book.
I captured both the configurations as well as mine.
So, if anyone knows well about multicast, please help me out.
Here is the topology.
--------------------------------------------------------------------------------
Broadcast SRC(10.1.1.10)+----+E0:10.1.1.1[RTR-A]S0+----MULTICAST CLOUD....
...MULTICAST CLOUD----+S0[RTR-B]E0:10.2.2.1+---Non-MC Receiver(10.2.2.10)
--------------------------------------------------------------------------------
And the Configurations
The differences are marked with (*).
--------------------------------------------------------------------------------
### 12.2 Multicast Configuration Guide ###
- http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcpt3/1cfmulti.htm#wp1003511
- Eth1 is in the example of CCO is changed to S0 in the example here.
[RTR-A]
int e0
ip directed broadcast
ip multicast helper-map broadcast 224.5.5.5 100
ip pim dense-mode
!
access-list 100 permit udp any any 4000
!
ip forward-protocol udp 4000
[RTR-B]
int e0
ip directed-broadcast
ip multicast helper-map 224.5.5.5 10.2.2.255 100
ip pim dense-mode
!
access-list 100 permit udp any any 4000
!
ip forward-protocol udp 4000
!!! This is what Williamson tells us to be careful about.
The 'ip multicast helper-map' command shouldn't be configured,he says,
on an outgoing interface where non-multicast-capable receivers reside.
But the configuration guide tells us to do so!!!
### Developing IP Multicast Networks(by Beau Williamson) ###
[RTR-A]
int e0
ip directed-broadcast
ip multicast-helper broadcast 224.5.5.5 100
!
access-list 100 permit any any udp 4000
!
ip forward-protocol udp 2000
[RTR-B]
int s0
ip multicast helper-map 224.5.5.5 10.2.2.255 100
ip igmp join-group 224.5.5.5(automatically configured by IOS)
!
int e0
ip directed-broadcast
!
access-list 100 permit udp any any eq 4000
### My Solution ###
[RTR-A]
int e0
--> I don't think this interface is a multicast interface.
ip directed-broadcast
--> Since the interface should process the broadcast
ip multicast helper-map broadcast 224.5.5.5 100
--> Since the router should translate broadcast into multicast
!
access-list 100 permit udp any any 4000
!
ip forward-protocol udp 4000
[RTR-B]
int s0
ip multicast helper-map 224.5.5.5 10.2.2.255 100
--> Since the router should translate the multicast into broadcast
ip igmp join-group 224.5.5.5(automatically configured by IOS)
ip pim dense-mode
--> Since this interface is included in the multicast cloud
int e0
--> I don't think this interface is a multicast interface.
ip directed-broadcast
--> Since this interface should process broadcast
!
access-list 100 permit udp any any 4000
!
ip forward-protocol udp 4000
--------------------------------------------------------------------------------
> ip forward-protocol udp 4000
>
> [RTR-B]
>
> int s0
> ip directed-broadcast
> ip multicast helper-map 224.5.5.5 10.2.2.255 100
> ip pim dense-mode
> !
> access-list 100 permit udp any any 4000
> !
> ip forward-protocol udp 4000
>
>
> ### Developing IP Multicast Networks(by Beau Williamson) ###
>
> [RTR-A]
>
> int e0
> ip directed-broadcast
> ip multicast-helper broadcast 224.5.5.5 100
> !
> access-list 100 permit any any udp 4000
> !
> ip forward-protocol udp 2000
>
> [RTR-B]
>
> int s0
> ip multicast helper-map 224.5.5.5 10.2.2.255 100
> ip igmp join-group 224.5.5.5(automatically configured by IOS)
> !
> int e0
> ip directed-broadcast
> !
> access-list 100 permit udp any any eq 4000
>
> ### My Solution ###
>
> [RTR-A]
>
> int e0
> --> I don't think this interface is a multicast interface.
> ip directed-broadcast
> --> Since the interface should process the broadcast
> ip multicast helper-map broadcast 224.5.5.5 100
> --> Since the router should translate broadcast into multicast
> !
> access-list 100 permit udp any any 4000
> !
> ip forward-protocol udp 4000
>
> [RTR-B]
>
> int s0
> ip multicast helper-map 224.5.5.5 10.2.2.255 100
> --> Since the router should translate the multicast into broadcast
> ip igmp join-group 224.5.5.5(automatically configured by IOS)
> ip pim dense-mode
> --> Since this interface is included in the multicast cloud
> int e0
> --> I don't think this interface is a multicast interface.
> ip directed-broadcast
> --> Since this interface should process broadcast
> !
> access-list 100 permit udp any any 4000
> !
> ip forward-protocol udp 4000
>
> --------------------------------------------------------------------------------
>
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