Error Messages on Catalyst 4500/4000 Series Switches
%C4K_HWPORTMAN-4-BLOCKEDTXQUEUE:Blocked transmit queue HwTxQId[dec]on [char], count=[dec]
Problem
The switch generates %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE:Blocked transmit queue HwTxQId[dec]on[char], count=[dec] errors.
Description
This rate-limited message indicates that a transmit queue on a port is blocked for reasons other than “paused”. In other words, the traffic on that port is being limited and blocked. You see the blocked transmit queue messages if the Supervisor Engine is not able to send packets to the line card because of the reception of a busy bit from the line card. Bad hardware or a speed/duplex mismatch can cause this problem. The workaround is to configure both sides of the link to autonegotiate for speed and duplex. Issue the shut/no shut command in order to recover the port. If the problem persists, move the connected device to another port and see if the problem happens there. As a final measure to unblock the transmit (Tx) queue, issue the hw-module reset command in order to reboot the switch or reset the line card.
%CDP-4-NVLANMISMATCH: Native vlan mismatch detected on port [dec]/[dec]
Problem
The switch generates frequent %CDP-4-NVLANMISMATCH syslog messages.
Description
This example shows the console output that you see when this error message occurs on the switch:
%CDP-4-NVLANMISMATCH:Native vlan mismatch detected on port 4/1
The switch generates this message whenever the switch port is physically connected to another switch or router. The switch generates this message because the configured native VLAN on the port is different than the native VLAN that is set on the connecting switch or router port.
A trunk port that you configure with IEEE 802.1Q tagging can receive both tagged and untagged traffic. By default, the switch forwards untagged traffic with the native VLAN that is configured for the port. If a packet has the same VLAN ID as the outgoing port native VLAN ID, the packet is transmitted untagged. If the VLAN IDs are not the same, the switch transmits the packet with a tag.
Ensure that the native VLAN for an 802.1Q trunk is the same on both ends of the trunk link. If the native VLAN on one end of the trunk is different than the native VLAN on the other end, the traffic of the native VLANs on both sides cannot be transmitted correctly on the trunk. This failure to transmit correctly can imply some connectivity issues in your network.
In order to verify the native VLAN that is configured on your switch, issue the show trunk mod/port command. In this command, mod/port is the trunk port. Here is sample output from the command:
Console> (enable) show trunk 5/24
Port Mode Encapsulation Status Native vlan
-------- ----------- ------------- ------------ -----------
5/24 desirable dot1q not-trunking 1
Port Vlans allowed on trunk
-------- ---------------------------------------------------------------------
5/24 1-1005
Port Vlans allowed and active in management domain
-------- ---------------------------------------------------------------------
5/24 1
Port Vlans in spanning tree forwarding state and not pruned
-------- ---------------------------------------------------------------------
5/24
Console> (enable)
In order to change the native VLAN that is configured on the trunk port, issue the set vlan vlan-id mod/port command. In this command, mod/port is the trunk port.
上述信息来源于下面的文档
Common CatOS Error Messages on Catalyst 4500/4000 Series Switches
https://www.cisco.com/c/en/us/su ... ches/30003-176.html
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