Disaster Recovery Backup PVC's

[rflanary]

How would i implement backup DR PVC's on frame-relay. I have a frame-relay network and my provider has assigned us backup PVC's. Our main office hosts the T1 host connection. My backup site is 1hr 30mins from the main office. Its out in the sticks and no access to DSL. Our plan is to host both our backup frame connection and back internet connection on the same physical circuit that currently exists at this site. Its a Full T1. It will be divided into 512k circuits. Dont ask why. Boss will not spring for the extra money. Having to make do with what i have. Something is better than nothing. My question really is how do i configure the remote sites to fail over to the backup PVC.

Backup Core Router Config

interface Serial0/0

bandwidth 1536

no ip address

encapsulation frame-relay IETF

logging event subif-link-status

logging event dlci-status-change

no fair-queue

frame-relay traffic-shaping

frame-relay lmi-type ansi

!

interface Serial0/0.1 point-to-point

description DR Internet Pipe DLCI 18

bandwidth 512

ip address 168.39.7.14 255.255.255.252

frame-relay class cisco

frame-relay interface-dlci 18 IETF

!

interface Serial0/0.17 point-to-point

bandwidth 512

ip address 172.16.6.5 255.255.255.252

frame-relay class cisco

frame-relay interface-dlci 37

!

interface Serial0/0.21 point-to-point

bandwidth 256

ip address 172.16.6.21 255.255.255.252

frame-relay class cisco512k

frame-relay interface-dlci 31

!

interface Serial0/0.22 point-to-point

bandwidth 128

ip address 172.16.6.1 255.255.255.252

frame-relay class cisco512k

frame-relay interface-dlci 32

!

interface Serial0/0.23 point-to-point

bandwidth 128

ip address 172.16.6.25 255.255.255.252

frame-relay class cisco384k

frame-relay interface-dlci 33

!

interface Serial0/0.26 point-to-point

bandwidth 128

ip address 172.16.6.29 255.255.255.252

frame-relay class cisco512k

frame-relay interface-dlci 36

!

One remote site config

interface Serial0/0/0
bandwidth 512
no ip address
encapsulation frame-relay IETF
ip route-cache flow
logging event subif-link-status
logging event dlci-status-change
no fair-queue
service-module t1 timeslots 1-8
frame-relay traffic-shaping
frame-relay lmi-type cisco
!
interface Serial0/0/0.1 point-to-point
bandwidth 512
ip address 172.16.6.30 255.255.255.252
no cdp enable
frame-relay class cisco512k
frame-relay interface-dlci 16
!

interface Serial0/0/0.2 point-to-point
description backup PVC
bandwidth 128
ip address 172.16.6.30 255.255.255.252
no cdp enable
frame-relay class cisco512k
frame-relay interface-dlci 17
!


I would guess i would have to use a whole new IP subnet for the backup PVC's as well as use BGP or some type of routing protocol. Right now i use EIGRP.

Any sample confs or help would be appreciated.

Thanks

 

[rflanary]

Anyone?

 

[brianinms]

Run a dynamic routing protocol such as EIGRP.

 

[paul3461000]

Looks like to me that since you are already running EIGRP that you should be all set.

EIGRP calculates that best route using the bandwidth and delay on each interface in calculating the metrics. It will put the best route (fastest) in the routing table.

You can see the EIRGP routes by doing a 'show ip route' command. The routes with the 'D' are EIRGRP routes.

To verify that your backup routes are also being picked up by EIGRP do a 'show ip eigrp topology'. You should see two routes listed where you have two PVC's.

If your primary route fails then it gets taken out of the routing table and the backup route is put in.

Just make sure your running EIGRP on your backup router and everything should be fine.

You should also enable HSRP (Hot Standby Routing Protocol) so that if your primary router fails the backup router becaomes the default-gateway for the network.

 

[rflanary]

how do you enable HSRP?

 

[burtsbees]

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_configuration_example09186a0080094e90.shtml

Burt

 

[rflanary]

How do I use more than one static default route on the core dr router. Remember my single router serves both internal and external access thru s0. Normally I would use ip route 0.0.0.0 0.0.0.0 172.18.14.2 to send all traffic to the firewall from the core router. Then on the firewall I would use route Outside 0.0.0.0 0.0.0.0 168.*.*.* 1 (edge router). The edge router would have ip route 0.0.0.0 0.0.0.0 (ISP serial int) to forward to my next hop.


How can I accomplish this with one router and still have everything go thru the firewall. Any ideas or suggestions?