Mark, Your problem is that both routers are set to recover timing from the line. Telcos don't generally provide timing for DS3s, so you'll need to set one router for internal clock.
A lot of folks that work with T1s know that telcos can and do provide timing for those lower-rate circuits. How they do this is a mystery to most folks. It isn't some magic button or switch. Telcos (usually the LEC) have to run a T1 through a Digital Access Cross-connect System (DACS) in order to provide timing. There are T3 DACS systems, but I'm not aware that any of them are capable of providing timing (I’m not saying absolutely that none do but I am saying that I haven’t found a DACS manufacturer that claims to support such a feature). It isn't economical for one thing. It isn't useful to the carrier for another. The internal details of how DACS provide timing for lower-rate circuits get a little esoteric and are hard to discuss without a whiteboard handy. I'm contemplating an article on WAN technologies for IP folk, so maybe I'll get into that later. Regards, Scott Mark Walmsley wrote: > > Thanks Spio, > > I've cleared the counters for "show int" and noticed that the > input errors are showing up on the 7200 and not on the 7500 > which might make things a bit clearer, the counters hadn't been > cleared since installation so the 7500 input errors might have > been from when it was first brought online. I've also included > the output from the "show controllers" command if you wouldn't > mind having a look for me, although I didn't get much output > from the "show controllers" command on the 7500. > > Thanks again for your help! > > Mark. > > > 7200 > > > Serial4/0 is up, line protocol is up > Hardware is M1T-T3 pa > Description: NOC01-DS3-MAN01 > Internet address is ***.***.***.***/30 > MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, > reliability 255/255, txload 22/255, rxload 7/255 > Encapsulation HDLC, crc 16, loopback not set > Keepalive set (10 sec) > Restart-Delay is 0 secs > Last input 00:00:00, output 00:00:00, output hang never > Last clearing of "show interface" counters 00:07:55 > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output > drops: 0 > Queueing strategy: fifo > Output queue :0/40 (size/max) > 5 minute input rate 1381000 bits/sec, 1721 packets/sec > 5 minute output rate 3917000 bits/sec, 1590 packets/sec > 802887 packets input, 84321394 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 parity > 6238 input errors, 6041 CRC, 0 frame, 19 overrun, 0 > ignored, 178 abort > 741267 packets output, 223596220 bytes, 0 underruns > 0 output errors, 0 applique, 0 interface resets > 0 output buffer failures, 0 output buffers swapped out > 0 carrier transitions > rxLOS inactive, rxLOF inactive, rxAIS inactive > txAIS inactive, rxRAI inactive, txRAI inactive > > NOC01#sho controllers s4/0 > M1T-T3 pa: show controller: > PAS unit 0, subunit 0, f/w version 2-56, rev ID 0x2800001, > version 3 > idb = 0x619FE658, ds = 0x61A00158, ssb=0x61A00430 > Clock mux=0x30, ucmd_ctrl=0x0, port_status=0x1 > Serial config=0x8, line config=0x1B0202 > maxdgram=4584, bufpool=128Kb, 256 particles > > rxLOS inactive, rxLOF inactive, rxAIS inactive > txAIS inactive, rxRAI inactive, txRAI inactive > line state: up > cable type : T3 cable, received clockrate 44202795 > > base0 registers=0x3E000000, base1 registers=0x3E002000 > mxt_ds=0x61F6A72C, rx ring entries=128, tx ring entries=256 > rxring=0xF1A3940, rxr shadow=0x61A01C34, rx_head=99 > txring=0xF271140, txr shadow=0x61A02260, tx_head=77, > tx_tail=77, tx_count=0 > throttled=0, enabled=0 > rx_no_eop_err=253, rx_no_stp_err=0, rx_no_eop_stp_err=0 > rx_no_buf=0, rx_soft_overrun_err=0, dump_err= 1, bogus=0, > mxt_flags=0x2C > tx_underrun_err=0, tx_soft_underrun_err=0, tx_limited=0(256) > tx_fullring=10077, tx_started=35856555 > Framing is c-bit, Clock Source is Line > Bandwidth limit is 44210, DSU mode 0, Cable length is 10 > rx FEBE since last clear counter 1, since reset 226 > Data in current interval (18 seconds elapsed): > 398 Line Code Violations, 120 P-bit Coding Violation > 120 C-bit Coding Violation > 17 P-bit Err Secs, 0 P-bit Sev Err Secs > 0 Sev Err Framing Secs, 0 Unavailable Secs > 17 Line Errored Secs, 17 C-bit Errored Secs, 0 C-bit Sev > Err Secs > Total Data (last 1 15 minute intervals): > 16278 Line Code Violations, 5140 P-bit Coding Violation, > 5107 C-bit Coding Violation, > 885 P-bit Err Secs, 0 P-bit Sev Err Secs, > 0 Sev Err Framing Secs, 12 Unavailable Secs, > 889 Line Errored Secs, 885 C-bit Errored Secs, 0 C-bit Sev > Err Secs > > No alarms detected. > > > > > 7500 > > MAN01#sho int s0/0/0 > Serial0/0/0 is up, line protocol is up > Hardware is cyBus PODS3 Serial > Description: MAN01-DS3-NOC01 > Internet address is ***.***.***.***/30 > MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, > reliability 255/255, txload 7/255, rxload 22/255 > Encapsulation HDLC, crc 16, loopback not set > Keepalive set (10 sec) > Last input 00:00:00, output 00:00:00, output hang never > Last clearing of "show interface" counters 00:07:46 > Queueing strategy: fifo > Output queue 0/40, 0 drops; input queue 0/75, 0 drops > 5 minute input rate 3905000 bits/sec, 1576 packets/sec > 5 minute output rate 1369000 bits/sec, 1722 packets/sec > 724700 packets input, 218412581 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 parity > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 > abort > 790994 packets output, 82205471 bytes, 0 underruns > 0 output errors, 0 applique, 0 interface resets > 0 output buffer failures, 0 output buffers swapped out > 0 carrier transitions > LC=up CA=down TM=down LB=down TA=down LA=down > > MAN01#sho controller s o/o/o > Serial0/0/0 - > Mx T3(2) HW Revision 0x3, FW Revision 3.9 > Framing is c-bit, Clock Source is Line > Bandwidth limit is 44210, DSU mode 0, Cable length is 10 > Data in current interval (789 seconds elapsed): > 0 Line Code Violations, 0 P-bit Coding Violation > 0 C-bit Coding Violation > 0 P-bit Err Secs, 0 P-bit Sev Err Secs > 0 Sev Err Framing Secs, 1 Unavailable Secs > 0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err > Secs > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65502&t=65491 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
