接入级交换机排错常用命令
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交换机常用排错命令
公司目前使用的交换机型号主要有CISCO3524/3548,CISCO2924,2948G,其中2948G是CA T OS系统，其它都是IOS系统，以下列举一些常用的命令
一、S HOW命令
a)IOS系统
Show mac-address-table 查看MAC地址
0901_CYYQ_01#show mac-address-table ?
address mac address name 指定MAC地址查找端口
aging-time Show address aging time
count Show address count 统计地址总数
dynamic Show 802.1d dynamic addresses 指定显示动态地址
interface interface name 指定显示某接口下学到的地址notification MAC notification parameters and history table
secure Show secure addresses
self Show system self addresses
static Show static addresses
vlan vlan name 指定显示某VLAN下的地址
| Output modifiers 输出过滤
例子:
0901_CYYQ_01#show mac-address-table dynamic vlan 901
Non-static Address Table:
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0000.21ff.ffff Dynamic 901 FastEthernet0/22
0000.4ca3.2267 Dynamic 901 FastEthernet0/2
……………………………
0000.f076.21d0 Dynamic 901 FastEthernet0/21
0000.f076.628a Dynamic 901 FastEthernet0/43
0901_CYYQ_01#show mac-address-table | include 0005.5d
0005.5d00.1d5d Dynamic 901 FastEthernet0/13
0005.5d0f.db8b Dynamic 901 FastEthernet0/20
0005.5d5d.d2b8 Dynamic 901 FastEthernet0/11
0005.5d67.15e3 Dynamic 901 FastEthernet0/20
0901_CYYQ_01#show mac-address-table interface f0/1 如果下面有机器接上，但地址没有说
Non-static Address Table:
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0050.1821.af83 Dynamic 901 FastEthernet0/1
5254.ab4e.0099 Dynamic 901 FastEthernet0/1
Show interface 检查接口状态
0901_CYYQ_01#show interfaces f0/1
FastEthernet0/1 is up, line protocol is up
Hardware is Fast Ethernet, address is 0005.325f.f601 (bia 0005.325f.f601)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:08, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 19000 bits/sec, 35 packets/sec
5 minute output rate 476000 bits/sec, 68 packets/sec
305967593 packets input, 4049522368 bytes
Received 1204589 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 如果不为0,且持续增长，说明线路有问题
0 watchdog, 797179 multicast
0 input packets with dribble condition detected
201607417 packets output, 2686439280 bytes, 490 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
490 output buffer failures, 0 output buffers swapped out
Show log 查看LOG记录
show processes cpu 查看CPU
交换机正常值一般在50％左右
Show env 查看设备运行环境状态
b)CAT OS 系统
SHOW PORT