cisco 2950级联tp-link，端口老是err-disabled。导致网络不通，如何处理？

时间：2014-12-25 18:43:04 阅读：295 评论：0 收藏：0 [点我收藏+]

标签：hardware protocol address 交换机 media

几天前，使用一台cisco 2950交换机和tp-link 24口的100mb端口的交换机级联。导致cisco 2950设备上的级联端口在使用一天后，第二天早上上班时发现端口显示err-disabled.网络不通。如何处理？

查看接口状况：

GX-SW-2950-01#sh interfaces f0/2

FastEthernet0/2 is down, line protocol is down (err-disabled)

Hardware is Fast Ethernet, address is 0011.bb48.d4c2 (bia 0011.bb48.d4c2)

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

reliability 254/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, Auto-speed, media type is 100BaseTX

input flow-control is unsupported output flow-control is unsupported

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

Last input 12:08:35, output 12:08:35, 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 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

7828496 packets input, 3836732423 bytes, 0 no buffer

Received 153627 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

2 input errors, 1 CRC, 1 frame, 0 overrun, 0 ignored

0 watchdog, 89124 multicast, 0 pause input

0 input packets with dribble condition detected

7809493 packets output, 2721732114 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

只有2 input errors, 1 CRC, 1 frame,2 interface resets。按道理不足以导致接口进入err-disabled状态。

没有办法，只能配置err-disabled。启用recovery功能。命令如下：

GX-SW-2950-01(config)#errdisable recovery interval 30

GX-SW-2950-01(config)#errdisable recovery cause all

经过几天测试，可以正常使用。可惜的事情，没有搞清楚为何进入err-disabled状态。原因有很多种可能。但不知道是哪个。下面是cisco默认提供的几种可能原因：

GX-SW-2950-01#show errdisable detect

ErrDisable Reason Detection status

----------------- ----------------

udld Enabled

bpduguard Enabled

security-violatio Enabled

channel-misconfig Enabled

psecure-violation Enabled

dhcp-rate-limit Enabled

unicast-flood Enabled

vmps Enabled

pagp-flap Enabled

dtp-flap Enabled

link-flap Enabled

gbic-invalid Enabled