Todd, do you have any kind of shaping / QoS on these circuits? Drops by traffic management configurations are frequently shown as interface drops.
Dave. Todd Shipway wrote: > Hi, > > We have multiple T1 interfaces across different cards and different type > of cards in a 7513. Many interfaces are showing output drops and I > can't pinpoint why. The interfaces are spread throughout the system and > I can't pinpoint a single point that could be causing the drops. Below > is 2 interfaces showing the drops. > > The bandwidth is very low when the drops are occurring, these 2 > interfaces are part of a multilink interface which shows no drops. Any > ideas as to what I should look for that could be causing this? > > Serial9/0/0:12 is up, line protocol is up > Hardware is cyBus T3 > Description: Bonded T1 > MTU 1500 bytes, BW 1540 Kbit, DLY 20000 usec, > reliability 255/255, txload 11/255, rxload 5/255 > Encapsulation PPP, LCP Open, multilink Open > Link is a member of Multilink bundle Multilink66, 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 6d03h > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: > 4050 > Queueing strategy: fifo > Output queue: 0/100 (size/max) > 5 minute input rate 33000 bits/sec, 19 packets/sec > 5 minute output rate 68000 bits/sec, 18 packets/sec > 3121597 packets input, 667733893 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort > 2929740 packets output, 1363133541 bytes, 0 underruns > 0 output errors, 0 collisions, 0 interface resets > 0 output buffer failures, 0 output buffers swapped out > 0 carrier transitions no alarm present > Timeslot(s) Used: 1-24, Transmitter delay is 0 flags > non-inverted data > > Serial9/0/0:11 is up, line protocol is up > Hardware is cyBus T3 > Description: Bonded T1 > MTU 1500 bytes, BW 1540 Kbit, DLY 20000 usec, > reliability 255/255, txload 10/255, rxload 5/255 > Encapsulation PPP, LCP Open, multilink Open > Link is a member of Multilink bundle Multilink66, 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 6d03h > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: > 4085 > Queueing strategy: fifo > Output queue: 0/100 (size/max) > 5 minute input rate 31000 bits/sec, 19 packets/sec > 5 minute output rate 65000 bits/sec, 17 packets/sec > 3122847 packets input, 668516220 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort > 2930011 packets output, 1364226428 bytes, 0 underruns > 0 output errors, 0 collisions, 0 interface resets > 0 output buffer failures, 0 output buffers swapped out > 0 carrier transitions no alarm present > Timeslot(s) Used: 1-24, Transmitter delay is 0 flags > non-inverted data > > Multilink interface for the T1's above: > Multilink66 is up, line protocol is up > Hardware is multilink group interface > Description: Bonded T1 > Internet address is 10.10.56.1/30 > MTU 1500 bytes, BW 3080 Kbit, DLY 100000 usec, > reliability 255/255, txload 11/255, rxload 4/255 > Encapsulation PPP, LCP Open, multilink Open > Open: IPCP, loopback not set > Keepalive set (10 sec) > DTR is pulsed for 2 seconds on reset > Last input 00:00:30, output never, output hang never > Last clearing of "show interface" counters 1w0d > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 > Queueing strategy: Class-based queueing > Output queue: 0/40 (size/max) > 5 minute input rate 58000 bits/sec, 47 packets/sec > 5 minute output rate 139000 bits/sec, 49 packets/sec > 7075294 packets input, 1705142684 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort > 7483773 packets output, 3524642362 bytes, 0 underruns > 0 output errors, 0 collisions, 0 interface resets > 0 output buffer failures, 0 output buffers swapped out > 0 carrier transitions > > Any help would be appreciated. As I said earlier, this scenario is > happening on multiple interfaces throughout the system. A Channelized > DS3 card has been swapped out as a test as well as the output queue > raised from 40 to 100 with no change in drops. > > -Todd > > > > ------------------------------------------------------------------------ > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
