clocking problem on frame-relay network

mpaul · ‎06-02-2005

I have a remote site with a Frame-relay line. The line has shutdown on me. If we reboot the router it comes back up. 2811 using 1 mft-t1. I had a syslog server attached and it said:

%Controller-5-Updown: Controller T1 0/1/0, changed state to down (AIS detected)

I've been talking to TAC and they've indicated this is a remote site problem. However, I control the router on the remote site. Since it's frame-relay does that mean the provider Frame-Relay switch or the 3845 on the other side?

In either case, I'm wondering about the clocking on the line. I'm receiving a lot of slipped seconds and errored seconds on the 2811 remote-site router. I have clocking set to: clock source line.

On the 3845, it has a MultiLink Frame-Relay bundle with 3 MFT-T1's attached to it. Those 3 MFT-T1's are attached to a mux (Adtran) device sitting on site. The clock source on these controllers is: Clock source internal. I see errors on the controller, slipped seconds, errored seconds.

Was wondering if I should set the clocking on the 3845 hub site router with those MFT-t1's to clock source line.

Thoughts?

mpaul · ‎06-02-2005

Just to answer myself here. I set the 3845 HUB site to clock source line and the errors I was having on that router went away.

Only issue is the remote 2811 router. That has been clock source line and/or clock source internal, doesn't seem to make a difference as the errors keep rising.

Currently it is clock source line.

smif101 · ‎06-06-2005

The big question is how are these adtran mux's connected in your network. Do these have a DS3 that connect to a telco or are these adtran connected directly fia fiber of some sort. Do these adtran's have stratum 1 clock attached to it. If not the clock in them is problably no better than the clocks in the router. If the adtran is connected to a telco then use the input from the telco as your clock and set that to line on both sides. This will be used to clock the rest of the cards on the adtran which then can pass the clock onto the routers which should be set to line.

If the adtrans are directly connected to each other than you should set one to be internal and the other line, and the routers again set to line.

But the first thing you should do is to start setting loops in the network and clearing the counters on the routers and try to determine at what point in the network you start receiving errors. It could be as easy as a bad connector somewhere.