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NPE-G1 flushes and ignored packets


About two weeks ago I made some small changes to my router config that adjusted the ospf link cost on two interfaces to better balance some traffic. Ever since then multiple interfaces will sporadically (several times an hour) register ignored packets and queue flushes. These ignored packets seem to be occurring at the same time on different interfaces across the router.

From what I understand these are due to SPD drops. But is there only one SPD queue, or multiple queues per interface? If theres only one SPD queue for the RP, then I guess that could explain the simultaneous errors.

Can anyone provide any tips or shed any light on whats going on here?

Thanks in advance,


Router#sh int f1/0

FastEthernet1/0 is up, line protocol is up

Hardware is DEC21140, address is 0001.9799.0c1c (bia 0001.9799.0c1c)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 98/255, rxload 171/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

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 6d08h

Input queue: 0/256/0/14148 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 67105000 bits/sec, 9996 packets/sec

5 minute output rate 38600000 bits/sec, 15520 packets/sec

3812152843 packets input, 3518844419 bytes

Received 458 broadcasts, 0 runts, 0 giants, 45 throttles

672121 input errors, 0 CRC, 0 frame, 0 overrun, 644384 ignored

0 watchdog

0 input packets with dribble condition detected

1341997684 packets output, 2254340484 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Router#sh int f1/0 switching


Throttle count 45

Drops RP 0 SP 0

SPD Flushes Fast 14148 SSE 0

SPD Aggress Fast 5878

SPD Priority Inputs 364738 Drops 0

Protocol IP

Switching path Pkts In Chars In Pkts Out Chars Out

Process 1562854 464514691 894021 60224151

Cache misses 0 - - -

Fast 3818204887 591790070 1352576135 1524795816

Auton/SSE 0 0 0 0

Protocol ARP

Switching path Pkts In Chars In Pkts Out Chars Out

Process 460 27600 463 27780

Cache misses 0 - - -

Fast 0 0 0 0

Auton/SSE 0 0 0 0

Protocol Other

Switching path Pkts In Chars In Pkts Out Chars Out

Process 0 0 54907 3294420

Cache misses 0 - - -

Fast 0 0 0 0

Auton/SSE 0 0 0 0

NOTE: all counts are cumulative and reset only after a reload.

Router#sh ip spd

Current mode: normal.

Queue min/max thresholds: 73/199, Headroom: 100, Extended Headroom: 75

IP normal queue: 1, priority queue: 0.

SPD special drop mode: aggressively drop bad packets

Router#sh ver

Cisco Internetwork Operating System Software

IOS (tm) 7200 Software (C7200-IS-M), Version 12.3(23), RELEASE SOFTWARE (fc5)

Super Bronze

Re: NPE-G1 flushes and ignored packets

I've seen a similar issue on the G1 when BGP conducts it scan. (Work around was to increase inbound queue size.) Check if CPU history showing any 100% spikes.