If you have 2 links, why not utilize them the best you can? Here's what I
would do:
1.) Run HSRP on the routers inside interfaces. Configure it to track the
serial interfaces on both routers.
2.) Run BGP and learn FULL internet routing table on both routers. Run a
cross over cable between the routers and do IBGP on them. This will help
protect against an upstream ISP failure or just a plain BGP failure with one
of the ISP. HSRP can only track a physical outage. This will also allow,
dynamically, the routers to choose which ISP to use for OUTBOUND traffic.
If one ISP is down, router 2 will still have the full route table from r1
via iBGP.
3.) Make sure your networks are both be routed to the ISPs. You can telnet
to route-server.cerf.net and see if they are. By advertising to both, they
will both advertise for you, and the world will take the path with the
shortest AS_PATH attribute coming to you.
4.) Now you have redundancy outbound/inbound and a backup strategy that is
dynamic.
It's a little more complicated than that but it should give you an idea.
Kenny
----- Original Message -----
From: "Raymond Everson (Rainman)" <[EMAIL PROTECTED]>
To: "Lekan Magbagbeola" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Sunday, July 02, 2000 7:58 AM
Subject: Re: Static Routing or Route Maps
> Pardon my interruption Lekan.... I *believe* there may be one
consideration
> missing from your advice. If I am wrong, please forgive me. Floating
statics
> which point to a next hop address are, of course, hard-coded routes in
your
> IGP table... no matter if the metric for a secondary or backup route has a
> larger AD.... the one with the smaller AD is hard-coded in the route
table; if
> it goes down, there's no way for the route table to know it. What I have
> done to overcome this is to use the interface itself as the next hop,
e.g.:
>
> 0.0.0.0 0.0.0.0 Serial0/0.1
> 0.0.0.0 0.0.0.0 Serial0/0.2 200
>
> ... but, truth be known, I do not have a very granular explanation why
this
> configuration is able to dynamically perform routing table maintenance.
>
> How 'bout it you Brainiacs?
>
> R/
> Rainman
>
> Lekan Magbagbeola wrote:
>
> > Debbie,
> >
> > How about if you configure two floating static routes and make the
static
> > route to the primary link to have a lower admin distance than the
secondary
> > link. Try this and let me know if it works.
> >
> > Lekan
> >
> > >From: "Debbie Westall" <[EMAIL PROTECTED]>
> > >Reply-To: "Debbie Westall" <[EMAIL PROTECTED]>
> > >To: <[EMAIL PROTECTED]>
> > >Subject: Static Routing or Route Maps
> > >Date: Fri, 30 Jun 2000 11:15:20 -0700
> > >
> > >Greetings,
> > >
> > >I have a customer that has two routers, each with links to ISPs. The
links
> > >are statically routed. Using default routes in each router. They would
like
> > >to have one link switch over to the other if one fails and when it
comes up
> > >switch back. Is there a way to do this using static routing still
(maybe
> > >floating static routes) or can I use route-maps OR will I have to
configure
> > >a routing protocol?
> > >
> > >Thank you for your assistance.
> > >
> > > ********************************************
> > >Debbie Westall Conxion Corporation
> > >Manager, Network Support 4201 Burton Drive
> > >Voice: (408) 566-8534 Santa Clara, CA 95054-1512
> > >Pager: (408) 407-2917 Email: [EMAIL PROTECTED]
> > > *******************************************
> > >
> >
> > ________________________________________________________________________
> > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
> >
> > ___________________________________
> > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> > FAQ, list archives, and subscription info: http://www.groupstudy.com
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
> ___________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
