Cisco 2,950 Cascade Tp-link, ports are always err-disabled. Causes the network to be not through, how to deal with?

A few days ago, a switch cascade using a Cisco 2950 switch and a 100MB port of Tp-link 24 ports. Causes the Cascade ports on the Cisco 2950 device to be in use one day later, the next morning when the port shows err-disabled. The network is not working. How to deal with?

To view the interface status:

GX-SW-2950-01#SH Interfaces F0/2

FASTETHERNET0/2 is off, line protocol was down (err-disabled)

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

MTU bytes, BW 100000 Kbit, DLY usec,

Reliability 254/255, Txload 1/255, Rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive Set (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

Only 2 input errors, 1 CRC, 1 frame,2 interface resets. The reason is not enough to cause the interface to enter the err-disabled state.

There is no way to configure err-disabled only. Enable the recovery feature. The command is as follows:

gx-sw-2950-01 (config) #errdisable recovery interval 30

gx-sw-2950-01 (config) #errdisable recovery cause all

After a few days of testing, can be used normally. The unfortunate thing, did not figure out why into the err-disabled state. There are a number of possible reasons. But I don't know which one. The following are some possible causes that Cisco provides by default:

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

Loopback Enabled

Dhcp-rate-limit Enabled

Unicast-flood Enabled

You can actually test each one individually. To find out the real reason, but there are 15 possibilities. Think about it or forget it.

Cisco 2,950 Cascade Tp-link, ports are always err-disabled. Causes the network to be not through, how to deal with?