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%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE on Cisco 4506

I keep getting log as below on one of my Cisco 4506:

Sep 28 09:55:58.861 GMT+8: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport 159, count=50398

I tried Error Message Decoder,it says

"A transmit queue on a port is blocked for reasons other than "paused." Bad hardware could cause this problem."

I wonder which bad hardware it is should I replace it?

  • Other Network Infrastructure Subjects
1 REPLY
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Re: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE on Cisco 4506

The %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE:Blocked transmit queue HwTxQId[dec]on[char], count=[dec] error message is generated on a Cisco Catalyst 4500 series switch when connected to a device. This error is a rate-limited message that indicates a transmit queue blockage on a port.

In this case, the traffic on the affected port is limited and blocked for reasons other than being paused. This blockage can occur if the supervisor is not able to send packets to the line card because a busybit message is received. In this situation, blocked transmit queue messages are seen. A bad hardware or speed and duplex mismatch can cause this problem

Perform these procedures as a workaround for this issue:

* Issue the shut /no shut commands to recover the port and configure both ends to operate at the same speed and duplex.

* If the problem persists, move the connected device to another port and see if the problem also happens there.

* Issue the hw-module reset command to reboot the switch or reset the line card, as a final attempt to unblock the Transmit (Tx) queue.

Alternatively, upgrade the the Cisco IOS? version to the 12.2(25)EWA2 and 12.2(25)SG releases, which have the fix for this problem.

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