Cisco Switch debugging

檢查 interfaces 找看看有哪些異常. 下列斜體字就是基本該檢查的部份. e.g. reliability, Input queue, input / output rate, input errors, and so on..

cisco-3560#show interfaces

GigabitEthernet0/1 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is xxxx.xxxx.xxxx (bia xxxx.xxxx.xxxx)

Description: ‘UPLINK, TO UPLINK-G1/0/1’

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:25, output 00:00:00, output hang never

Last clearing of “show interface” counters never

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 4614000 bits/sec, 676 packets/sec

5 minute output rate 7537000 bits/sec, 732 packets/sec

1390054399 packets input, 3062338575 bytes, 0 no buffer

Received 320051 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 320036 multicast, 0 pause input

0 input packets with dribble condition detected

3713836416 packets output, 2891595501 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

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

可以清除某個介面重新觀察.

cisco-3560#clear interface GigabitEthernet 0/1

檢查 CPU是否有過載.

cisco-3560#show processes cpu

CPU utilization for five seconds: 7%/2%; one minute: 7%; five minutes: 7%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

1 0 16 0 0.00% 0.00% 0.00% 0 Chunk Manager

2 73 1280349 0 0.00% 0.00% 0.00% 0 Load Meter

3 0 1 0 0.00% 0.00% 0.00% 0 CEF IPC Backgrou

檢查是否有異常的logs?

cisco-3560#show logging

Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)