Re: [OSL | CCIE_RS] BGP design question

BGP fall-over or BGP fast-external-fallover will NOT help, based on what i
am reading.

One solution that many think about is to configure 2 static default routes
(Floating static routes) and redistribute them into BGP (One with higher and
the other with a lower AD), if this is what you are thinking about, you need
to remember to redistribute them with a route-map, in the route-map you need
to manipulate the local pref and the weight attribute on the backup link, or
else when the backup takes over, it will never let go, even though the
primary is up (The third item in the BEST path determination).

I like Scott's solution with IP SLA and EEM in the mix.

On Sun, Mar 28, 2010 at 6:08 AM, venkat <venkat.elex_at_gmail.com> wrote:

> Hi Patrice,
>
> Is there any intermediate device(L2 switch/vpls) between your device and
> partner neighbor on primary link?
> Is the session with partner via directly connected interface IP subnet? if
> that is the case, failure in the circuit might not remove the IP address
> from the routing table and fall-over will not work.
>
> Also, when the primary circuit comes back, the bgp session will UP.. If the
> partner is propagating routes with less med on primary compare to
> secondary,
> then i believe the primary will be again selected for outgoing traffic.
>
> Marko, please correct me if i am wrong.
>
> Thx,
> Venkat
>
> On Sun, Mar 28, 2010 at 5:17 PM, Marko Milivojevic <markom_at_ipexpert.com
> >wrote:
>
> > On Sun, Mar 28, 2010 at 06:54, Patrice Ngassam <pangassam_at_hotmail.com>
> > wrote:
> > > Hi,
> > > I have a customer that is dual homed to the same partner using BGP. One
> > link
> > > is primary and the second is backup. We are looking for scenario where
> > the
> > > bgp peer on the primary link will be shutdown automatically in case of
> > > failure of the primary circuit. Traffic will failover to the backup
> > circuit
> > > and would never switch automatically the primary even if the circuit
> > comes
> > > back unless we manually re-enable the bgp peer on the primary circuit.
> Is
> > > that do-able? Does anyone have a better alternative?
> >
> > Take a look at "neighbor fall-over" command. You can use it to
> > accomplish exactly what you have in mind.
> >
> > --
> > Marko Milivojevic - CCIE #18427
> > Senior Technical Instructor - IPexpert
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