Question about Cisco Catalyst 4006 Chassis ( 4006)

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Cisco error on switch

I cannot find a explanation for the following error:
SYS-4-P2_WARN: 1/Tag 6 on packet from 00:0a:b8:e8:7d:5e port 3/48, but port's native vlan is 1
it is occurring on Cisco switch, the port that is mentioned is going to a Cisco router.

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%SYS-4-P2_WARN: 1/Tag 0 The switch generates %SYS-4-P2_WARN: 1/Tag 0… messages.
This example shows the syslog output that you see when this error occurs:
%SYS-4-P2_WARN: 1/Tag [dec] on packet from [ether] port [chars],
but port's native vlan is [dec] This message indicates that an 802.1Q-tagged packet was received on a nontrunk port. The VLAN that is derived from the packet tag is different from the port native VLAN. In the error message:

  • The Tag [dec] is the VLAN identifier from the packet.
  • The [ether] is the host MAC address.
  • The port [chars] is the port identifier.
  • The second [dec] is the native VLAN number.
There is a possibility that the local port is incorrectly configured as an access port instead of a trunk port. Alternately, the remote side can have been configured as a trunk port instead of an access port.
Verify that the local port is not incorrectly configured as an access port instead of a trunk port. Also, verify that the remote side is not configured as a trunk port instead of an access port.

Posted on Feb 06, 2008

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Start troubleshooting the problem by checking the physical layer (Plugs, Jacks, Cables). Replace them with known working equipment.

Once you have traced the line from your Cisco to each other end (through to ISP, and to network switch), then reset your error counters, by restarting the cisco.

Check the ethernet interfaces on the network switch and the Cisco. Make sure they are both set to Autonegotiate or both set to the same settings like 100mbs Full-duplex. If they are not communicating the same way lots of errors will be generated.

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