Unanswered Question
Jun 25th, 2008
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Hi Guys, ladys ;)

I receive a error message, in a Catalyst 4506, but cant understand wich port is referring about.

%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport 11, count=1

Show version, says i have several interface port numbers, for different media type.

How can i detect wich port is the "Phyport 11" ?

SWINFOR_1# show module

Chassis Type : WS-C4506

Power consumed by backplane : 0 Watts

Mod Ports Card Type Model Serial No.


1 2 Supervisor II+ 1000BaseX (GBIC) WS-X4013+ JAE1011WSMA

2 34 10/100BaseTX (RJ45), 1000BaseX (GBIC) WS-X4232-GB-RJ JAE041102CG

3 24 10/100/1000BaseT (RJ45) WS-X4424-GB-RJ45 JAB070117AX

4 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAB0711167P

5 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45 JAE1011V35L

M MAC addresses Hw Fw Sw Status


1 0016.4722.6c40 to 0016.4722.6c41 4.1 12.2(20r)EW1 12.2(25)EWA5 Ok

2 0004.2733.d758 to 0004.2733.d779 2.3 Ok

3 000a.f444.aeb0 to 000a.f444.aec7 1.5 Ok

4 000b.fd55.e1d0 to 000b.fd55.e1ff 1.1 Ok

5 0016.c866.7fe0 to 0016.c866.800f 2.2 Ok

Best Regards,

Bruno Petrónio

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jerry_best Wed, 06/25/2008 - 09:54
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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.

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.

b.petronio Sun, 06/29/2008 - 10:10
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Tks for your reply, but u dont take off my doubt.

Wich port is the Phyport11 ????

I already done some research in the Error Message Decoder, and understood the reason of the message.

What i could not understood, was the Physical Port 11 ?!?!?!?

Best Regards,


Giuseppe Larosa Sun, 06/29/2008 - 11:40
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Hello Bruno,

I would point to a link to the backplane inside the c4506 switch.

or I would do a show snmp mib ifmib ifindex to see what interface has SNMP ifindex 11 if any.

hope to help


mitch.gentry Fri, 01/08/2010 - 09:05
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Sorry this is such a late reply...hopefully you've moved on to other issues but the command "sho platform mapping ports" will show you what Phyport isd mapped to the actual interface.

regards ~


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