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BGP Failover Question

I would simply monitor PPS on those links and set a threshold which will
kick off an alert at least. If your scripting savvy, other tools such as IP
SLA and EEM on Cisco could be used to automate the failover. Juniper also
has a similar scripting tool that can probably do the same. I've had this
happen before and is a real pain.


On Mon, Feb 21, 2011 at 3:10 PM, Chris Wallace <lists at iamchriswallace.com>wrote:

> I am looking for some help with an issue we recently had with one of our
> BGP peers recently.  I currently have two DIA providers each terminated into
> their own edge router and I am doing iBGP to exchange routes between the two
> edge routers.  Last week Provider A made a policy change "somewhere" in
> their network in the middle of the day causing traffic to stop routing.  Of
> course this connection happens to be the preferred route for the majority of
> our inbound and outbound traffic.  I never saw our physical link go down and
> never saw our peer drop therefore BGP did not stop advertising routes, this
> caused most of our customers traffic to go nowhere.  In order to fix the
> issue I had to manually shutdown the peer till Provider A confirmed the
> change they made had been reverted.  This isn't the first time we have seen
> this issue with our various providers, how can I prevent issues like this
> from happening in the future?
> ---Chris