[c-nsp] BGP v4 multicast

Gert Doering gert at greenie.muc.de
Wed Oct 1 12:08:09 EDT 2008


On Wed, Oct 01, 2008 at 04:50:49PM +0100, Phil Mayers wrote:
> Just a quick question; what's the best syntax for causing an eBGP 
> session with v4 multicast AF to originate routes?

Same way you currently do it with IPv4 unicast, just put the statements
under "ipv4 multicast".

As in - if you're doing "redistribute static route-map foo", you can
just put the same statement under "address-fam ipv4 multicast" as well.

>   address-family ipv4 multicast
>     neighbor activate
>     network netmask
>     network netmask

This will work fine.

> ...and will it originate & via multicast to the 
> eBGP peer? 

It will not "originate via multicast", but it will send these two prefixes
in the IPv4 multicast address-family - via the normal TCP/IPv4 unicast 
BGP session. Yes.

> Is this recommended?

Well, we have just removed all IPv4 multicast BGP from our network, since
it doesn't work on "the global Internet" :-) - but technically, use whatever
works for you in IPv4 unicast to bring the prefixes into BGP.


USENET is *not* the non-clickable part of WWW!
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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