ebgp Connection with PIM but no MP-BGP Configuration

Answered Question
Dec 22nd, 2009
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Hi All,


Quick one if I may.


If you run eBGP with an external AS and you want to pass multicast over from one AS to another (lets say both ASs are within my admin control), can I just run PIM on the interfaces on both ends of the eBGP connection (lets say they are directly attached) and multicast will flow through?


Or do I have to configure MP-BGP?


Many thx indeed,

Ken

Correct Answer by Nagendra Kumar ... about 7 years 6 months ago

Hi,


If your AS is already aware of the Multicast source addresses, you can have MSDP between AS and have the traffic flow between AS. But incase, you dont have or dont need unicast traffic between sources in different AS, you need MP-BGP with multicast AFI and advertise the source prefix.


This will be only used for RPF and not for unicast traffic forwarding.


HTH,

Nagendra

Correct Answer by Marwan ALshawi about 7 years 6 months ago

of course you can

MP-BGP not required at all

you need MP-BGP if you have MPLS network


by the way if you want to enable bgp between tow BGP domains in diffrent AS you may need to consider MSDP for better control and security


have a look at the following document:

https://supportforums.cisco.com/docs/DOC-8293


good lcuk

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Correct Answer
Marwan ALshawi Tue, 12/22/2009 - 04:21
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of course you can

MP-BGP not required at all

you need MP-BGP if you have MPLS network


by the way if you want to enable bgp between tow BGP domains in diffrent AS you may need to consider MSDP for better control and security


have a look at the following document:

https://supportforums.cisco.com/docs/DOC-8293


good lcuk

if helpful rate

Correct Answer
Nagendra Kumar ... Tue, 12/22/2009 - 05:50
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  • Cisco Employee,

Hi,


If your AS is already aware of the Multicast source addresses, you can have MSDP between AS and have the traffic flow between AS. But incase, you dont have or dont need unicast traffic between sources in different AS, you need MP-BGP with multicast AFI and advertise the source prefix.


This will be only used for RPF and not for unicast traffic forwarding.


HTH,

Nagendra

kfarrington Tue, 12/22/2009 - 06:31
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Many thx to all of you for the response.  This is great


Kind regards,

Ken

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