Cisco 2811 Redundancy

[tkhans]

Hi wonder if someone can help?

I have a Cisco 2811 router with a SDSL WIC

Ther requirement is connect the primary link through a Serial E1 circuit to PE A and another SDSL circuit to PE B.

Therefore, the Serial will be Primary and SDSL the Resilience.

My question is, how within the same router can I configure the resiliency? i.e. e.g. in E1 with ADSL backup, you use the "ip route 0.0.0.0 0.0.0.0 Dialer1 200" for example?

How can i configure such that if the Primary (E1) goes down then the resilience "SDSL" kicks in within the same router?

 

[burtsbees]

Is it doing NAT?

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[tkhans]

No there is no NAT involved.

 

[burtsbees]

Just a simple floating static route then.

Your example is correct. It may take up to 10 seconds or so (I think that is how long it took in my lab), but the failover is automatic. Is there a routing protocol involved, or all static in the 2811?

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[tkhans]

We have BGP running between CE and PE's.

I am not sure what protocol they are using on LAN, but if, e.g. they are using EIGRP or OSPF, then how different will the CE Config be?

I believe we will have to re-distribute the routes?

 

[Minue]

Do you have the same ISP for both links.If you are running BGP between CE and PE ,you will have to work on the local preference.Make a route-map and apply it to BGP neighbor of the ADSL link.Also please post a scrub conf.

Regards

 

[tkhans]

Hi,

Yes - I have the same ISP for both links.
Can I set something like this below?

router bgp XXX
neighbor PE1_IP_Address weight 65000
neighbor PE2_IP_Address route-map SETMED out
!
route-map SETMED permit 10
set metric 1111
!

I am not sure how i can use Local preference - also, is local preference used for CE to PE routes or PE to CE, or is it for both?

Thanks...

 

[Minue]

Hello
We use local preference for our clients.But the wieght can be use as well.MED isn't going to help you because maybe the ISP doesn't consider MED.So go with the wieght or local preference.Below is how we configure our CE's.

Router bgp 1
neighbor 192.168.1.1 route-map Backup in

route-map Backup permit 10
match ip address prefix-list Backup
set local-preference 90

ip prefix-list Backup seq 10 permit XXX.XXX.XXX.XX
ip prefix-list Backup seq 20 permit XXX.XXX.XXX.XX
etc.

Regards