Re: BGP SOO

Hi,

BGP have loops prevention mechanisms embedded , and we have tools to bypass
this aspect of BGP, such as AS-Override or the allowas-in, SOO Extended
Community is a loop prevention mechanism needed only for customer networks
with multihomed sites. Loops can never occur in stub sites, the SOO
Attribute,is used to prevent loops, when EBGP is running between the PE and
CE routers, and this attribute is configured using a route-map. Now if the
PE-CE routing protocol is not BGP we configure SOO under vrf interface by ip
vrf sitemap command.

router bgp 123
!
address-family ipv4 vrf CCIESP
neighbor 6.6.6.6 remote-as 999
neighbor 6.6.6.6 route-map SETSOO in
!
route-map SETSOO permit 10 set extcommunity soo 96:96

BGP SOO Link
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htbgpsoo.html#wp1055228
NON BGP Example:
http://wiki.nil.com/Multihomed_MPLS_VPN_sites_running_EIGRP

HTH

thanks,Victor.-

On Mon, Jun 1, 2009 at 6:34 PM, Splinter <splinter330_at_gmail.com> wrote:

> Hi all,
>
> Is BGP Site-of-Origin only used with MPLS VPN or can this feature also be
> used in IPV4 BGP?
>
>
>
> Splinter
>
>
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Victor Cappuccio
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