[Xorp-users] Qualified-Next-Hop Problem

[Florian Thiessenhusen]

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?

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