6500 Error: %C4K-HWPORTMAN-4_BLOCKEDTX QUEUE...

[mlenco]

We've lost routes for a segment of our network and sh log of one of two core switch shows:

%C4K_HWPORTMAN-4-BlOCKEDTX-QUEUE:blocked transmit queue HwTxQId0 on switch Phyport Gig4/47 count-126607

What does the error indicate?

[glen.grant · Accepted solution]

Error Message C4K_HWPORTMAN-4-BLOCKEDTXQUEUE:Blocked transmit queue HwTxQId[dec] on

[char], count=[dec]

Explanation 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. You could also upgrade the Cisco IOS version to the 12.2(25)EWA2 or 12.2(25)SG releases.

[mlenco]

A Dell Optiplex PC running Windows AMD emulation dirver for a Broadcom 5700 NIC supports 10/100. We move this PC around and the problem follows that port. We turn the port on and CPU utilization goes to 100%. We shut it down and the CPU levels off to 20%. The PC is off but the NIC has wake on LAN. We turned off the port and will have the server/pc owner back out of the driver.