[isp-bgp] Re: BGP Multi-homing

["calvin wong" <kinwong@...>]

Hi ,
could you give a sample config ?
Thanks


----- Original Message ----- 
From: "Pete Templin" <petelists@...>
To: <isp-bgp@isp-bgp.com>
Sent: Thursday, April 08, 2004 1:28 AM
Subject: [isp-bgp] Re: BGP Multi-homing


> Muhammad Umar Farooq wrote:
>
> > Network Info:
> > 1) One Cisco router running BGP.
> > 2) Connected with two backbone providers. (A and B)
> > 3) /21 IP block from APNIC.
> > Requirements:
> > 1) Some IP classes to use A as primary link and others to use B as
> > primary link.
> > 2) In case of failure of any one link all traffic redirected to the
> > available link.
>
> Get another router.  Put backbone B on the other router.  Put A-centric
> networks on one router, B-centric networks on the other router.
> Announce A-centric networks to backbone A, and to backbone B with extra
> prepends and perhaps a provider-specific community to request a lower
> local preference within their providers.  Announce B-centric networks to
> backbone B, and to backbone A with extra prepends and perhaps a
> provider-specific community to request a lower local preference within
> their providers.  Have router 1 default outbound to backbone A, and
> router 2 default outbound to backbone B.
>
> If you want to do it on one router, you'll need to use policy routing to
> control the outbound path, which adds complexity, particularly when
> troubleshooting.
>
> pt
>
>
>
>




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