[c-nsp] BGP timers

[Uddin, Tahir]

With this picture,

CE1-----PE1----MPLS cloud-----PE2-----CE2


If next hop tracking is enabled on CE1, and there is a problem between
PE2 and CE2 or an issue in the cloud, would it still be useful?

BTW, Mark, what is the lowest you would go within the CORE and the
lowest on the customer WAN link and are there any resource issues
(memory, cpu) that are of concern. 

Thanks.
Tahir

-----Original Message-----
From: Mark Tinka [mailto:mtinka at globaltransit.net] 
Sent: Tuesday, April 08, 2008 8:19 AM
To: cisco-nsp at puck.nether.net
Cc: Uddin, Tahir
Subject: Re: [c-nsp] BGP timers

On Tuesday 08 April 2008, Uddin, Tahir wrote:

> When connecting a CE to a PE, is there a minimum
> recommended BGP hold down timer. I am currently using 90
> seconds with both of my carriers but it is causing
> applications to time out when there is a failure in one
> of the carriers network or if a local loop goes down. One
> of the carriers ruled out going down to 15 seconds, said
> it was too low.

We are aggressive with timers within our own core. However, 
we keep it simple with customers unless there is a special 
request. At any rate, BGP will use the smaller of the two 
received in the open message during setup.

That said, if both sides are Cisco (and you have the 
requisite IOS release), you may consider testing the BGP 
Next Hop Address Tracking feature (enabled by default in 
supporting releases) and BGP Fast Peering Session 
Deactivation (configurable in supporting releases).

Cheers,

Mark.

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