Packet Drops at 4948 with a wiered message

Unanswered Question
Jan 25th, 2009

Hi,

I've couple of 4948 in my setup but today morning, my colleague reported that one of our server is not responding. I checked the repective port on switch and that port was UP and UP. But to my surprise there were lots of packet drops in there. Logs revealed following messages for that port:

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28014

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28014

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28129

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28129

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28244

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28244

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28359

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28359

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28474

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28474

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28589

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28589

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/23, count=28704

5w4d: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId1 on Switch Phyport Gi1/23, count=28704

Can anyone suggest what these messages are for and how to fix them. Port configurations are very simple like so many other working ports.

Regards,

I have this problem too.
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crow930us Sun, 01/25/2009 - 04:21

The message indicates that a port is blocked or limited. This could either be a hardware issue or a speed/duplex mismatch.

Some other things you might try to resolve the issue is to issue a shot/no shut command for the interface, move the connected device to a different port and see if the problem is still there.

glen.grant Sun, 01/25/2009 - 04:38

From the output interpreter.

ERROR MESSAGE NOTIFICATIONS (if any)

%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE (x14):Blocked transmit queue HwTxQId[dec]

on [char], count=[dec]

Explanation: A transmit queue on a port is blocked. Bad hardware or continuous

pause frames from the peer can cause this problem.

Recommended Action: Determine if the peer is continually sending pause frames

to the port. If so, troubleshoot the peer. If not, contact your technical support

representative.

%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE (x0): 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

the Cisco IOS version to the 12.2(25)EWA2 or 12.2(25)SG releases.

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