[AusNOG] IOS router selection

[Colin Stubbs]

Those commands are setting an admin configured distance for the static
route. That's all.

ARP is not involved. You'd need to use object tracking with IP SLA's to
achieve anything more intelligent if using static routes only.

Google will drown you in answers,

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/27082-ip-static-routes.html

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/sweot.html#wp1084626


On 5 May 2014 15:58, Alex Samad - Yieldbroker <Alex.Samad at yieldbroker.com>wrote:

> Hi
>
> I am looking for some documentation that explains the way cisco behaves.
>
> If I have this
>
> IOS
> ip route 0.0.0.0 0.0.0.0 w.x.y.z 230
> ip route 0.0.0.0 0.0.0.0 f.g.h.i  240
> ip route 0.0.0.0 0.0.0.0 r.s.t.u 250
>
> ASA
> route internet 0.0.0.0 0.0.0.0 w.x.y.z 230
> route internet 0.0.0.0 0.0.0.0 f.g.h.i 240
> route internet 0.0.0.0 0.0.0.0 r.s.t.u 250
>
>
> this tells me the default gateway used is w.x.y.z, unless that gateway is
> unavailable or dead..
>
> I am looking at how Cisco decides when a gateway is dead, I found
> documents on route selection, but nothing that specifically address dead
> gateways
>
> I presume, and from what I have seen if there is no arp its dead..
>
> Thanks
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