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Lim Seow Hua
Beginner

switch hang issue

Hi guys,

We have received a lot below message from our syslog server:-

%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId2 on Switch Phyport Gi2/3, count=1134 - 1 repeats suppressed in 600 seconds

The switch suddenly hang by itself and when we console in and "show int status" we could not see the interface on that switch.


ANyone encounter this issue before?

1 REPLY 1
Shashank Singh
Cisco Employee

This rate-limited message indicates that a transmit queue and traffic on a port is blocked or limited for reasons other than being "paused".  You may see the blocked transmit queue message if the supervisor  engine is not able to send packets to the switching module because it  received a busy bit from the switching module. A hardware failure or a  speed/duplex mismatch can cause this problem.

Recommended Action:

Configure both sides of the link to  autonegotiate for speed and duplex. Issue the shut/no shut command to  recover the port. If the problem persists, move the connected device  to another port and see if the problem happens there. If neither of  these solves the problem, issue the hw-module reset command in order  to reboot the switch and reset the line card.

What platform and IOS version are you observing this on?