Comments on: Dual WAN Router with Dual ISP Using BGP and OSPF

By: CTVA

CTVA — Wed, 30 Dec 2020 21:49:02 +0000

Billy, you could have the ISP provide you with the default networks and conditionally generate 0/0 based on the presence of the default networks is one way to do it. Then redistribute this route into OSPF.

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By: schloopadoop

schloopadoop — Sat, 20 Apr 2019 01:05:07 +0000

@Rob Tyrrell (@CiscoRobT)
Ideally you would want the router who lost it’s connection to the ISP to then route the router that is up. That is why it MUST have a default route to the up router, hence the “always” command.

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By: Antoine

Antoine — Fri, 21 Dec 2018 10:07:23 +0000

Hi, thank you for this article. However, i have a question… How to constrain R2 to take the default route ISP_A and R3 to take the default route to ISP_B ?

Thanks a lot for your return.

Regards

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By: Billy Bethell

Billy Bethell — Sat, 10 Mar 2018 23:18:48 +0000

In reply to Rob Tyrrell (@CiscoRobT).

Hi Rob, any idea how I could do that, please?

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By: dev

dev — Thu, 15 Feb 2018 14:23:18 +0000

Hi Phil,

In the same topology, can we configure OSPF between R2 and PE1 && BGP between R3 & PE2.

Regards

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By: ccna in pune

ccna in pune — Mon, 27 Nov 2017 10:38:50 +0000

Very informative and helpful article. Thanks for giving me an opportunity to read this valuable article.

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By: Rob Tyrrell (@CiscoRobT)

Rob Tyrrell (@CiscoRobT) — Wed, 31 May 2017 03:05:50 +0000

Nice article! Only thing I’m not sure about is the default originate always. Wouldn’t it be better to dynamically learn the default from each ISP, and if you lose connectivity to a given ISP it would then stop being advertised from the router who stopped receiving it? I’m thinking you could have a black hole situation in your example.

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