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List:       quagga-users
Subject:    [quagga-users 11755] Re: Static Linux Default Route with a Lower
From:       Kyle Brandt <kyle () kbrandt ! com>
Date:       2010-09-02 15:06:16
Message-ID: AANLkTi=bJ4zbL112qfHwbAzb_YeTgNq+c7GCSXpeFk0y () mail ! gmail ! com
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Tyler:

The syntax to add a route with a higher Metric seems to be:
route add default gw 192.168.1.1 metric 1000

So it seems that maybe Linux equates the administrative distance and
metric unlike Cisco?

from `man route`:
Metric: The 'distance' to the target (usually counted in hops). It is
not used by recent kernels, but may be needed by routing daemons.

So if this is the case it looks like this might be the answer I need
(will have to experiment).

Since this is the default route it seems like it shouldn't mess up any
directly connected routes.  Can you maybe explain the scenario of how
this would cause a problem with bad routes coming in over BGP -- I
don't fully understand...

Lennart:

The "Why not Zebra" is what I tried to say before -- I want a backup
in case zebra/bgpd fails. The particular case I have now is some sort
of race condition in upstart (I think) that causes the quagga suite
not to start at boot.  Chances are not that great, but if both my
routers power off and both have this issue I won't be able to ssh to
them remotely.

Thank you everyone for your time,
Kyle

2010/9/2 Tyler J. Wagner <tyler@tolaris.com>
>
> On Thursday 02 Sep 2010 14:19:01 Kyle Brandt wrote:
> > Does anyone know if there is a way to set a default route in Linux (not
> > zebra) that will have a lower priority than the default route received by
> > the BGP?  The idea is that if for some reason the quagga suite doesn't
> > start or crashes the router will still be able to be accessed remotely.
> > This is why I want to be able to put a static entry in Linux instead of
> > zebra but have it be overridden by the default route I receive from my BGP
> > peer.
>
> This should be a matter of setting the distance value for kernel routes to be
> higher than BGP. Kernel routes have a distance of 0, and I can't see where to
> change this. Of course, it would be dangerous to do this as it could result in
> the router ending up with no local routes for connected networks, if bad
> routes come in over BGP.
>
> Anybody else?
>
> Regards,
> Tyler
>
> --
> "It is a truism that almost any sect, cult, or religion will legislate
> its creed into law if it acquires the political power to do so, and
> will follow it by suppressing opposition, subverting all education to
> seize early the minds of the young, and by killing, locking up, or
> driving underground all heretics."
>   -- Robert A. Heinlein, Time Enough For Love, 1973
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