static via ip

[Ondrej Zajicek]

On Tue, Nov 23, 2010 at 12:59:00PM +0100, Petr Šťastný wrote:
> What is the meaning of word "neighbor" in this context?
>
> protocol static defaultgw {
>     route 0.0.0.0/0 via 192.168.1.20;
> }
>
> This static route will disappear from routing table when:
> a) 192.168.1.20 is not reachable (no route to host, no entry in local  
> routing table, router doesn't know how to reach it)
> b) 192.168.1.20 is not a neighbor in any routing protocol at the moment  
> (for example BGP session with 192.168.1.20 becomes down)

Neighbor means that the IP address is directly reachable by
a local network (there is an interface with IP prefix that
contains that address). It is irrelevant whether there is a route
to that IP address in a routing table.

> The goal is to shut down default route when BGP session with the BGP  
> neighbor goes down. So b) would be better behavior for me.
>
> The only way how to do this is to make a shell script that checks the  
> status of BGP sessions a enables/disables static routes?

Yes, that is the only way.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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