[Xorp-users] Qualified-Next-Hop Problem

[Pavlin Radoslavov]

Florian Thiessenhusen <Florian.Thiessenhusen at admeritia.de> wrote:

> Hi Pvlin,
> 
> thank for your fast help!
> 
> In my case, i have only one physical NIC where the two Gateways are connected (via switch). And the same NIC is used for requests vom clients. Should i combine are Ping-Probe Cron to detect, if a Gateway is down and let the cron job reconfigure the static-route config?

With a single NIC you can't use qualified-next-hop for its intended
purpose.
In that case you might want to use something like what you
suggest above: have a periodic ping probe, and if the ping fails use
xorpsh in script mode to reconfigure the static route.

Regards,
Pavlin

> 
> Thanks,
> Florian
> 
> ________________________________________
> Von: Pavlin Radoslavov [pavlin at ICSI.Berkeley.EDU]
> Gesendet: Montag, 11. Februar 2008 19:56
> An: Florian Thiessenhusen
> Cc: xorp-users at xorp.org
> Betreff: Re: [Xorp-users] Qualified-Next-Hop Problem
> 
> > I would like to know how the "Qualified-Next-Hop" mechanism
> > works. I have a static route and in my testlab i have two Internet
> > routers. When i disconnect the first router that is responsible
> > for the 0.0.0.0/0 static route the "Qualified-Next-Hop" does not
> > automatically switch to the alternative route (Next-Hop Gateway
> > 192.168.15.12).
> 
> The next-hop information for the primary and the qualified-next-hop
> should utilize different network interfaces.
> If the cable for the primary next-hop is disconnected, then the
> qualified-next-hop should take over.
> If it doesn't work, use the "show interfaces" xorpsh command: it
> should show "NO-CARRIER" for the disconnected interface.
> 
> Note that the NO-CARRIER detection might take up to 1 minute or so
> for certain network interface cards.
> Use the "ip monitor" for Linux or "route -n monitor" for BSD to see
> when the cable disconnection event upcall is generated.
> 
> Regards,
> Pavlin
> 
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