I've recently run into a slightly strange problem with one of my E1 circuits.
We operate a hub-and-spoke setup, where a number of lines terminate into a single aggregation router on our side, and into a bunch of different locations/CPEs on the remote end. For all these lines, we have always had 'clock source line' for the E1 controller on both the aggregation router and the CPE routers. This has worked fine and the controllers show no errors. I've just commissioned a new line into the same aggregation router, exactly the same equipment on the CPE side (2811, VWIC2-1MFT-G703), exactly the same equipment on PE side (2811, VWIC2-2MFT-G703). But this time, we were seeing continuous 'Slip Secs' (top marks to whoever made that term up incidentally), which were also showing up as 'Errored Secs' (but crucially, never 'Errored Secs'). After much investigation and a VWIC/chassis swap later, we were in exactly the same position. I think tried configuring the aggregation controller (just for that one port) with 'clock source internal' and bang all the errors disappeared completely. It's now been running well over 48h without a single errored second, versus 1 second per second before. For reference, the aggregation router now has: controller E1 0/0/1 framing NO-CRC4 clock source internal channel-group 0 timeslots 1-31 and the CPE has: controller E1 0/1/0 framing NO-CRC4 channel-group 0 timeslots 1-31 Has anyone seen anything like this before and/or know what might cause this? My telco insists that they've tested the circuit end to end and it's working as expected (and to be fair, it is now..) Thanks, Ras _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
