Thanks Morris,
I am using two dedicated routers to peer with my partner, one router for each
circuit and internal iBGP between the two routers. With my partner we are
running private eBGP, peering between loopback addresses.
Manual re-enablement of peering on the primary is a business requirement of my
partner, I received that after completing my design. I first told them it was
not possible to accomplish, Marko has suggested fall-back and your eem script
sounds good, the problem is that I am not really comfortable with eem script,
this is probable the best occasion to start learning eem scripting !
Patrice Ngassam
Ceritified Cisco CCNP, CCDP, CCIP
Date: Sun, 28 Mar 2010 09:10:15 -0400
From: [email protected]
To: [email protected]
CC: [email protected]; [email protected]; [email protected];
[email protected]; [email protected];
[email protected]; [email protected]
Subject: Re: [OSL | CCIE_RS] BGP design question
The easiest way to do that is to peer to a loopback, and have two
static routes in your table pointing to that loopback.
One with lower AD, one with higher AD.
When one disappears, the other automatically works. Then, when the
primary circuit comes back, it automatically switches back. Best thing
that way (if it's same box going to) that your BGP session doesn't go
away at all.
If you want manual re-enablement (kinda strange, but ok) then you
could always have an EEM script that detects link down message and adds
a "neighbor x.x.x.x shutdown" command for the one peer, yet your second
peer is fine (or un-shut would be good too). Script switches one way
automatically, but to go back requires manual intervention.
HTH,
Scott Morris, CCIEx4
(R&S/ISP-Dial/Security/Service Provider) #4713,
CCDE #2009::D, JNCIE-M #153, JNCIS-ER, CISSP, et al.
JNCI-M, JNCI-ER
[email protected]
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
Knowledge is power.
Power corrupts.
Study hard and be Eeeeviiiil......
Matt Hill wrote:
Why do you want to re enable it manually? Is there something specific
you are trying to achieve?
I cant think of any way offhand but you might be able to play with
dampening or something like that. Although I cant really see that
working either :)
Cheers,
Matt
CCIE #22386
CCSI #31207
On 28 March 2010 17:54, Patrice Ngassam <[email protected]> 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?
Patrice Ngassam
Ceritified Cisco CCNP, CCDP, CCIP
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