discards and errors in 3800 router

Unanswered Question
Jul 5th, 2010
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Hi everyone,


We just installed an NMS in the company network, and we noticed huge discards (output) in a Giga interface of our 3800 router. I've done some researchs on the net, and i end up by modifying the maximum sizes of input and output queues  of this interface. This action resolved the discard problem, but now i notice some input errors on the interface. What can i do to handle this issue?


here are the sh int and the sh buffers commands results



#sh int g 0/0
GigabitEthernet0/0 is up, line protocol is up
  Hardware is BCM1125 Internal MAC, address is 001b.d4d6.c8a0 (bia 001b.d4d6.c8a                                                                                                                                                             0)
  Description: $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-GE 0/0$
  Internet address is 117.20.32.1/26
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 24/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 100Mb/s, media type is RJ45
  output flow-control is XON, input flow-control is XON
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 3d23h
  Input queue: 0/75/0/18829 (size/max/drops/flushes); Total output drops: 2285
  Queueing strategy: fifo
  Output queue: 0/300 (size/max)
  5 minute input rate 2721000 bits/sec, 1754 packets/sec
  5 minute output rate 9785000 bits/sec, 2021 packets/sec
     632104240 packets input, 2686349346 bytes, 0 no buffer
     Received 179287 broadcasts, 0 runts, 0 giants, 0 throttles
     513 input errors, 0 CRC, 0 frame, 513 overrun, 0 ignored
     0 watchdog, 175971 multicast, 0 pause input
     0 input packets with dribble condition detected
     705271303 packets output, 2196691907 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out


s#sh buffers
Buffer elements:
     689 in free list (1119 max allowed)
     31974510 hits, 0 misses, 619 created


Public buffer pools:
Small buffers, 104 bytes (total 119, permanent 50, peak 263 @ 5w1d):
     113 in free list (20 min, 150 max allowed)
     2164695587 hits, 7645 misses, 7886 trims, 7955 created
     381 failures (0 no memory)
Middle buffers, 600 bytes (total 25, permanent 25, peak 60 @ 7w0d):
     23 in free list (10 min, 150 max allowed)
     1766879 hits, 167 misses, 165 trims, 165 created
     44 failures (0 no memory)
Big buffers, 1536 bytes (total 50, permanent 50, peak 520 @ 7w0d):
     50 in free list (5 min, 150 max allowed)
     2405168 hits, 138 misses, 733 trims, 733 created
     0 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10):
     10 in free list (0 min, 100 max allowed)
     7256 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 10 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
Huge buffers, 18024 bytes (total 1, permanent 0, peak 2 @ 7w0d):
     1 in free list (0 min, 4 max allowed)
     4860 hits, 1 misses, 2588 trims, 2589 created
     0 failures (0 no memory)


Interface buffer pools:
Syslog ED Pool buffers, 600 bytes (total 132, permanent 132):
     100 in free list (132 min, 132 max allowed)
     1535 hits, 0 misses
CD2430 I/O buffers, 1536 bytes (total 0, permanent 0):
     0 in free list (0 min, 0 max allowed)
     0 hits, 0 fallbacks
IPC buffers, 4096 bytes (total 560, permanent 560):
     560 in free list (280 min, 1120 max allowed)
     0 hits, 0 fallbacks, 0 trims, 0 created
     0 failures (0 no memory)


Header pools:
Header buffers, 0 bytes (total 768, permanent 768):
     256 in free list (128 min, 1024 max allowed)
     512 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
     512 max cache size, 512 in cache
     11309497 hits in cache, 0 misses in cache


Particle Clones:
     1022 clones, 996004 hits, 0 misses


Public particle pools:
F/S buffers, 256 bytes (total 768, permanent 768):
     256 in free list (128 min, 1024 max allowed)
     512 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
     512 max cache size, 512 in cache
     0 hits in cache, 0 misses in cache
CRYPTO_HW buffers, 1548 bytes (total 1536, permanent 1536):
     0 in free list (0 min, 1536 max allowed)
     1536 hits, 0 misses
     1536 max cache size, 1024 in cache
     512 hits in cache, 0 misses in cache
Normal buffers, 1676 bytes (total 3840, permanent 3840):
     3840 in free list (128 min, 4096 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)


Private particle pools:
HQF buffers, 0 bytes (total 2000, permanent 2000):
     2000 in free list (500 min, 2000 max allowed)
     17072633 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
IDS SM buffers, 240 bytes (total 128, permanent 128):
     0 in free list (0 min, 128 max allowed)
     128 hits, 0 fallbacks
     128 max cache size, 128 in cache
     0 hits in cache, 0 misses in cache
Hssi1/0 buffers, 512 bytes (total 256, permanent 256):
     0 in free list (0 min, 256 max allowed)
     256 hits, 0 fallbacks
     256 max cache size, 132 in cache
     124 hits in cache, 0 misses in cache
     10 buffer threshold, 0 threshold transitions
Serial0/0/0 buffers, 1536 bytes (total 64, permanent 64):
     0 in free list (0 min, 64 max allowed)
     64 hits, 0 fallbacks
     64 max cache size, 32 in cache
     32 hits in cache, 0 misses in cache
GigabitEthernet0/0 buffers, 1664 bytes (total 768, permanent 768):
     0 in free list (0 min, 768 max allowed)
     768 hits, 0 fallbacks
     768 max cache size, 512 in cache
     4272383407 hits in cache, 0 misses in cache
     14 buffer threshold, 1 threshold transitions
GigabitEthernet0/1 buffers, 1664 bytes (total 768, permanent 768):
     0 in free list (0 min, 768 max allowed)
     768 hits, 0 fallbacks
     768 max cache size, 508 in cache
     3182843933 hits in cache, 0 misses in cache
     14 buffer threshold, 0 threshold transitions


Best Regards

Bilel

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