Re: a routing question from Jafar T on 2009-04-22 (Ccielab archives 04/2009)

From: Jafar T <jafar_at_paris.com>
Date: Tue, 21 Apr 2009 22:23:40 -0500

where to find a good sample for this config, and would this work, even
the ip address is now rechable thru router B ?
how to fall back from it once dsl link is up

thx

  ----- Original Message -----
  From: "Joe Astorino"
  To: "Joe Astorino"
  Cc: ccielab_at_groupstudy.com, "Bryan Bartik" , "Jafar T"
  Subject: Re: a routing question
  Date: Wed, 22 Apr 2009 03:06:30 +0000 (UTC)

*edit* I meant the default route coming from router B would have a
HIGHER AD , and thus be less preferable.

"He not busy being born is busy dying" -- Dylan

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  ----- Original Message -----
  From: "Joe Astorino"
  To: "Jafar T"
  Cc: ccielab_at_groupstudy.com, "Bryan Bartik"
  Sent: Tuesday, April 21, 2009 11:02:14 PM GMT -05:00 US/Canada
  Eastern
  Subject: Re: a routing question

  I did something similar to this before. Building on what Bryan
  said, setup ip sla to do something like ping the default gateway
  your DSL ISP gives you. At the same time, have router B advertise a
  default route to router A. So, router A should have a static
  default route tied to the SLA pointing to your DSL, and a default
  route with a lower AD advertised from router B. If the SLA ping
  fails, your static route goes away and the one being advertised
  from router B kicks in.

"He not busy being born is busy dying" -- Dylan

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  ----- Original Message -----
  From: "Jafar T"
  To: "Bryan Bartik"
  Cc: ccielab_at_groupstudy.com
  Sent: Tuesday, April 21, 2009 10:49:44 PM GMT -05:00 US/Canada
  Eastern
  Subject: Re: a routing question

  thanks for the idea,
  but will not work, i always want A to use that static to firewall, i
  just
  want A to fail over if the dsl on the far far side of that fireall
  drops,
  in other words, if the dsl drops, A switch to B
  how can i do this tweak, without changing the FW config ?

thanks

  ----- Original Message -----
  From: "Bryan Bartik"
  To: "Jafar T"
  Cc: ccielab_at_groupstudy.com
  Subject: Re: a routing question
  Date: Tue, 21 Apr 2009 20:29:42 -0600

  It sounds like you need Router A to recognize when it should no
  longer use
  it's static default route, remove it, and then use the route towards
  B. You
  can create an SLA Tracker and tie it to the route. One thing you
  would watch
  out for is that whatever you track through the firewall is not
  reachable
  through Router B, otherwise the tracker would pass and the route
  would come
  up again. Although, maybe you could tweak the tracker to
  differentiate...Any
  other ideas?

  Bryan Bartik
  CCIE #23707, CCNP
  Sr. Support Engineer - IPexpert, Inc.
  URL: http://www.IPexpert.com

On Tue, Apr 21, 2009 at 8:02 PM, Jafar T wrote:

> hi team, i have a scenario,
  isp.......routerB......mpls/BGP.......router
  A.....firewall.....dsl...isp
>
> routeb, needs to act as a failover for A internet traffic router
> A, only has a static route to Firewall interface, routerA, will
> never detect the the dsl link down, since it is on
  another
> subnet so no matter what router B advertise, floting
> static..default originate....etc it willl be no good for A, it
> can see that in the table, looks
  good, but
> will never be activated as a another default route, since A always
  will
> see the static route to firewall, and it looks fine as far as the
  router
> a can tell, how can you change that, without enable a routing
> protocol on the firewall, in another words,
  without
> doing any changes on the firewall ? cheers JT -- It's News. It's
> Reviews. It's Interviews. It's Free. What Are You
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  _______________________________________________________________________
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Received on Tue Apr 21 2009 - 22:23:40 ART

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