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

2 Circuits from same ISP

I have 2 circuits from same ISP connected to 2 routers. I am running HSRP on the inside and router A is the primary. I have 2 default routes on router A 1 with next hop to ISP and 1 with next hop to router B. I have 2 default routes on router B with 1 to next hop ISP and 1 to next hop router A with a distance metric set for a greater distance. All works fine I get load balanced traffic to ISP over both routers. Problem is when circuit to ISP goes down on router B router A still sends traffic to router B and traffic is being dropped. Is the routing setuo correctly?

9 REPLIES
New Member

Re: 2 Circuits from same ISP

hi,

you can use HSRP TRACKING feature which will monitor the links always and if the link goes down divert the traffic accordingly..

standby track is the command to do

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8c.shtml

rate if it helps

rgds/shiva

New Member

Re: 2 Circuits from same ISP

The issue I had was not on the HSRP side it was on the ISP side when the ISP circuit goes down.

New Member

Re: 2 Circuits from same ISP

mike,

i couldn't get your question properly

what does that mean isp side down

is there single link between you and isp ?

rgds/shiva

New Member

Re: 2 Circuits from same ISP

I have a sinle link from each router to ISP

Hall of Fame Super Bronze

Re: 2 Circuits from same ISP

Mike,

That's the problem when configuring static routing as it doesn't adjust its path dynamically after a failure.

You may need to introduce Object tracking along with your static routing configuration.

With Object tracking you can intelligently detect a link failure.

Please see:

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

HTH,

__

Edison.

Please rate helpful posts

New Member

Re: 2 Circuits from same ISP

Both circuits from each router are fast ethernet circuits. Will this work? If I track the circuit to ISP will it down the route?

Hall of Fame Super Bronze

Re: 2 Circuits from same ISP

You can configure a SLA to ping an external device in the internet while sourcing from the interface connected between Router A & B. If that fails, the track will automatically determine the circuit is down and choose the second IP route from the list.

HTH,

__

Edison.

New Member

Re: 2 Circuits from same ISP

have you tried configuring the static utilizing the router egress interface in the syntax? fro example:

ip route 0.0.0.0 0.0.0.0 fa 0/0

New Member

Re: 2 Circuits from same ISP

I have not used the egress setting.

121
Views
0
Helpful
9
Replies
CreatePlease login to create content