[c-nsp] Detect Upstream ISP's BGP problems.

[Sumon Ahmed Sabir]

Another solution to that is ask your ISPs to get default routes from their
upstreams
and pass it to you and not to use default-originate. So if any ISP lost its
links with
its upstreams your default route will be automatically disappeared.

-sumon

On Fri, Dec 12, 2008 at 11:02 PM, <tkacprzynski at spencerstuart.com> wrote:

> That sounds like a good idea. Thank you very much.
>
> What do you think of using conditional advertisement based on their
> Route Reflector to advertise a default route? (I think the biggest
> problem is that most ISPs might not want to do that correct?)
>
> Thank you again.
>
>
> Tom
>
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Saku Ytti
> Sent: Friday, December 12, 2008 10:42 AM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Detect Upstream ISP's BGP problems.
>
> On (2008-12-12 09:57 -0600), tkacprzynski at spencerstuart.com wrote:
>
> > I know I could ask the ISPs to provide me a core route and use
> > conditional advertisement, which would work well for traffic coming
> > inbound, but what about outbound? How can I make the default route
> > disappear from an ISP that is having internal problems.
>
> Don't get default, get PA aggregate. And point static route to that PA
> aggregate and the interface. If ISPs peering router is separated from
> ISPs core, the PA aggregate disappears and static default will be
> invalid, allowing you to converge to another path.
>
> For more advanced stuff, you might want to look at 'PfR'
> from cisco.
>
> --
>  ++ytti
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