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
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