Question

P2P Link between 2 Cisco routers goes down every night.

Asked by: viracor

I have 2 separate locations connected over a fiber Point-to-Point connection with a Cisco 851 router on each end acting as a bridge.  The link goes down every night, except for the nights where I setup a constant ping to a device on the other side.  Is there some sort of keep alive setting I need to implement on the Cisco 851's?

Thanks!

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Asked On
2009-11-07 at 08:33:11ID24880560
Tags

Cisco

,

Router

,

Cisco 851

,

P2P

,

Point-to-Point

Topics

Network Routers

,

Network Design & Methodology

,

Network Operations

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: jodylemoinePosted on 2009-11-07 at 08:43:23ID: 25766937

If you're running those 851s over a fibre connection with no underlying protocols, there's really nothing to keep alive.  Normally a keepalive is used to make the underlying protocols (NAT, dial-on-demand, &c) involved in the transport of a VPN or switched connection happy.

If a ping is keeping it up, I suspect it's more complicated than a straight fibre connection.  Do the each of the routers have a BVI interface for the bridge?  If so, there's are a few things we can do.

 

by: jodylemoinePosted on 2009-11-07 at 08:50:51ID: 25767004

If there are BVIs set up on the 851 units, you can set up an IP SLA icmp-echo process on one end of the link to keep things up.

ip sla 10
 icmp-echo x.x.x.x
 timeout 500
 threshold 500
 frequency 60
ip sla schedule 10 life forever start-time now

Replace x.x.x.x with the BVI interface IP of the router at the other end of the link.  This will send a ping once per minute from the router with the IP SLA icmp-echo process to the other router, essentially providing a keepalive for your connection.

 

by: viracorPosted on 2009-11-17 at 13:28:29ID: 31651404

Thanks!

20120131-EE-VQP-002

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