Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Configuring Cisco 877 for redundany with ADSL and DSL

Hi All,

I would like to configure a Cisco 877 M router with two ISP connection. One is an ADSL service and the other is a DSL service (EFM).

Basically what i would like to achieve here is to keep one of the link on standby and quickly failover when the other one is down.

Can any one please help provide me with an info regarding the config and how i will be able to achive this.

Much appreciate your help!

Thank You.

2 ACCEPTED SOLUTIONS

Accepted Solutions
Purple

Configuring Cisco 877 for redundany with ADSL and DSL

Hi,

1) create ip sla object pinging an external IP

    ip sla 1

        icmp-echo 8.8.8.8

   ip sla schedule 1 start now life forever

2) use PBR or a static host route for the ip sla ping test using primary path

      ip route 8.8.8.8 255.255.255.255 dialer0

3) create a track object tracking the status of the preceding ip sla object

    track 2 rtr 1

4) create a static route for primary path using the track object

    ip route 0.0.0.0 0.0.0.0 dialer0 track 2

5) create a floating static route for the secondary path

      ip route 0.0.0.0 0.0.0.0 dialer1 2

6) create  2 route-maps for dynamic PAT with match on ACL and outgoing interface

     route-map DIAL0

    match ip address 101

    match interface dialer0

   route-map DIAL1

   match ip address 101

   match interface dialer1

Note : ACL 101 will tell which traffic must be natted

7) create 2 NAT overload statements using the route-maps

    ip nat inside source route-map DIAL0 interface dialer0

   ip nat inside source route-map DIAL1 interface dialer1

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
Purple

Configuring Cisco 877 for redundany with ADSL and DSL

Hi,

in the route-map you would match interface f0/0 instead of dialer and in your NAT you would use f0/0 instead of dialer

and for the static route you would point it to the next-hop instaed of the outgoing interface and everything else stays the same.

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
4 REPLIES
Purple

Configuring Cisco 877 for redundany with ADSL and DSL

Hi,

1) create ip sla object pinging an external IP

    ip sla 1

        icmp-echo 8.8.8.8

   ip sla schedule 1 start now life forever

2) use PBR or a static host route for the ip sla ping test using primary path

      ip route 8.8.8.8 255.255.255.255 dialer0

3) create a track object tracking the status of the preceding ip sla object

    track 2 rtr 1

4) create a static route for primary path using the track object

    ip route 0.0.0.0 0.0.0.0 dialer0 track 2

5) create a floating static route for the secondary path

      ip route 0.0.0.0 0.0.0.0 dialer1 2

6) create  2 route-maps for dynamic PAT with match on ACL and outgoing interface

     route-map DIAL0

    match ip address 101

    match interface dialer0

   route-map DIAL1

   match ip address 101

   match interface dialer1

Note : ACL 101 will tell which traffic must be natted

7) create 2 NAT overload statements using the route-maps

    ip nat inside source route-map DIAL0 interface dialer0

   ip nat inside source route-map DIAL1 interface dialer1

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
New Member

Configuring Cisco 877 for redundany with ADSL and DSL

Hi Alian,

Thank you very much for the post. I have not tested this yet. Looks like all the config should be good.

I was also wondering what would change if the second link is configured as Fa0/0 with IP address instead of dialer interface.

Much appreciate your help!

Regards,
Sam

Purple

Configuring Cisco 877 for redundany with ADSL and DSL

Hi,

in the route-map you would match interface f0/0 instead of dialer and in your NAT you would use f0/0 instead of dialer

and for the static route you would point it to the next-hop instaed of the outgoing interface and everything else stays the same.

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
New Member

Configuring Cisco 877 for redundany with ADSL and DSL

Hi,

Thank You very much for your help in this.

Much Appreciated.

Regards,
Sam

253
Views
0
Helpful
4
Replies
CreatePlease to create content