Re: BGP SOO

Like Victor said. it's a loop prevention mechanism. You could set this
extended community value on regular BGP as well, but it wouldn't be of
any use.

Rick Mur
CCIE2 #21946 (R&S / SP)
rick_at_rickmur.com

On 1 jun 2009, at 20:34, Victor Cappuccio wrote:

> 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
> CCIE R/S# 20657
> CCSI# 30452
> www.anetworkerblog.com
> www.linkedin.com/in/vcappuccio
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Mon Jun 01 2009 - 22:49:42 ART