automatic failover with 2600 router

comechivos · ‎02-06-2006

hello,

here is my situation, I have a cisco 2600 router with a cablemodem connection in the fastethernet port, and I have a T1 in a serial port too.

I am using the cablemodem like my primary internet connection, BUT I want to configure a failover system.

I want the T1 comes up when the cablemodem fail automatically.

can I do that? can you explain me how to do it?

thank you so much!

pkhatri · ‎02-06-2006

Hi,

Here's an example (you'll have to replace the IPs with the ones that are relevant to you).

Replace with an IP that you can ping through your main link - preferably the ISP side of the WAN link address.

interface Ethernet 0/0

description Primary Link

ip address 10.1.1.1 255.0.0.0

!

interface Serial0:1

description Backup Link

ip address 192.168.1.1 255.0.0.0

!

rtr 1

type echo protocol ipIcmpEcho

timeout 1000

frequency 3

threshold 2

!

rtr schedule 1 life forever start-time now

!

track 100 rtr 1 reachability

!

access list 101 permit icmp any host echo

!

route map LOCAL_POLICY permit 10

set ip next-hop 10.1.1.254

set interface null0

!

ip local policy route-map LOCAL_POLICY

!

ip route 0.0.0.0 0.0.0.0 10.1.1.254 track 100

ip route 0.0.0.0 0.0.0.0 192.168.1.254 254

Hope that helps - pls rate the post if it does.

Paresh

comechivos · ‎02-07-2006

nop, it didnt worked, what about nat? because I have a LAN nating there...

when I did what you told me I had lost internet connection in the LAN

thanks!

pkhatri · ‎02-07-2006

Hi,

You need to provide more details. The config I provided was an example...

Could you provide your current config and details of what needs to be NAT'ed to what ?

Thanks,

Paresh

comechivos · ‎02-08-2006

here it is,

thank tou!

pkhatri · ‎02-08-2006

Hi,

Could you advise which serial interface goes to the Internet ? You have two in the config..

Also, you said that you wanted the cable modem connection to be the primary connection, but in the current config, it seems to be routed via the serial...

If you could clarify that, we should be able to make this work.

Paresh

comechivos · ‎02-09-2006

yes, I m routing through the serials (both serials are T1 connected to the internet) because the cablemodem is a new connection, but I want to change that, I want to quit one of the serials and left the other serial as a backup connection, and the cablemodem as the primary connection.

Thank you!

pkhatri · ‎02-09-2006

Hi,

I just realized that you are running 12.2 on your router. You need at least 12.3(8)T for the reliable static route feature. What router are you using ? Could you post the output of show version ? You'll need to upgrade your IOS to make this work or you will find that the route through the cable modem will never go down.

Paresh

comechivos · ‎02-13-2006

I m using a 2600 router

Its dificult changing the IOS?

here is my show version.

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-IO3-M), Version 12.2(21), RELEASE SOFTWARE (fc3)

Compiled Tue 02-Dec-03 16:06 by kellmill

Image text-base: 0x8000808C, data-base: 0x80A6920C

ROM: System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)

router uptime is 3 days, 22 hours, 37 minutes

System returned to ROM by reload

System image file is "flash:c2600-io3-mz.122-21.bin"

cisco 2611XM (MPC860P) processor (revision 0x100) with 27648K/5120K bytes of mem

ory.

Processor board ID JAD07090LFT (3656634360)

M860 processor: part number 5, mask 2

Bridging software.

X.25 software, Version 3.0.0.

2 FastEthernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

32K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

Thank you !

pkhatri · ‎02-13-2006

Hi,

YOU will need a minimum of 96Mb of DRAM and 32Mb of flash to upgrade your box to a 12.3(8)T release.

Paresh