The way my company does it is to weight routes for the two PVC's.
Serial0/0.1 point-to-point
ip address 192.168.255.1 255.255.255.252
no ip route-cache
no cdp enable
frame-relay interface-dlci 20
!
Serial0/0.2 point-to-point
ip address 192.168.255.5 255.255.255.252
no ip route-cache
no cdp enable
frame-relay interface-dlci 21
!
ip route 10.0.0.0 255.0.0.0 192.168.255.2
ip route 10.0.0.0 255.0.0.0 192.168.255.6 200
!
end
wr
This says to route the traffic over S0/0.1 as it is directly connected.
Route the traffic over S0/0.2 if the primary link should become unreachable.
You have to be careful with the administrative distance on the backup route.
If you are running a routing protocol (OSPF, RIP, etc.) you will have to
take into account what the default distances are for these protocols. Keep
in mind that a route that points to an interface is distance 0 and a route
to an IP address is distance 1.
Kelly D Griffin, CCNA, CCDA
Network Engineer
Kg2 Network Design
http://www.kg2.com
----- Original Message -----
From: "Adam Wang" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 14, 2001 10:08 AM
Subject: backup subinterface on another subinterface
> Hi group,
>
> I have 2 PVCs setup using Frame Relay on a serial
> interface with 2 subinterafces, and I want these 2
> subinterfaces to backup each other when 1 fails.
>
> I did backup interface s0.2, but it won't allow a
> subinterface on the backup command, only the physical
> interface. So backup interface s0 is possible.
>
> Why is that and how can I do this
>
>
> Thanks in advance
>
>
> Adam
>
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