Loop Inconsistent

Unanswered Question
Nov 22nd, 2007

The A end:

Port 1 (GigabitEthernet1/1) of VLAN0001 is broken (Loop Inconsistent)

Port path cost 4, Port priority 128, Port Identifier 128.1.

Designated root has priority 8193, address 000d.656c.db80

Designated bridge has priority 32769, address 000e.383e.d800

Designated port id is 128.1, designated path cost 31

Timers: message age 0, forward delay 0, hold 0

Number of transitions to forwarding state: 10

Link type is point-to-point by default

Loop guard is enabled by default on the port

BPDU: sent 12339, received 9433880

Name Interface Inconsistency

VLAN0001 GigabitEthernet1/1 Loop Inconsistent

VLAN0002 GigabitEthernet1/1 Loop Inconsistent

VLAN0003 GigabitEthernet1/1 Loop Inconsistent

VLAN0004 GigabitEthernet1/1 Loop Inconsistent

VLAN0006 GigabitEthernet1/1 Loop Inconsistent

VLAN0007 GigabitEthernet1/1 Loop Inconsistent

VLAN0008 GigabitEthernet1/1 Loop Inconsistent

VLAN0009 GigabitEthernet1/1 Loop Inconsistent

VLAN0010 GigabitEthernet1/1 Loop Inconsistent

VLAN0011 GigabitEthernet1/1 Loop Inconsistent

VLAN0012 GigabitEthernet1/1 Loop Inconsistent

VLAN0013 GigabitEthernet1/1 Loop Inconsistent

VLAN0014 GigabitEthernet1/1 Loop Inconsistent

VLAN0015 GigabitEthernet1/1 Loop Inconsistent

VLAN0016 GigabitEthernet1/1 Loop Inconsistent

VLAN0017 GigabitEthernet1/1 Loop Inconsistent

VLAN0018 GigabitEthernet1/1 Loop Inconsistent

VLAN0020 GigabitEthernet1/1 Loop Inconsistent

VLAN0021

The B end:

ame Interface Inconsistency

-------------------- ---------------------- ------------------

VLAN0025 GigabitEthernet3/17 Loop Inconsistent

VLAN0030 GigabitEthernet3/17 Loop Inconsistent

VLAN0055 GigabitEthernet3/17 Loop Inconsistent

VLAN0099 GigabitEthernet3/17 Loop Inconsistent

VLAN0100 GigabitEthernet3/17 Loop Inconsistent

VLAN0101 GigabitEthernet3/17 Loop Inconsistent

VLAN0102 GigabitEthernet3/17 Loop Inconsistent

VLAN0105 GigabitEthernet3/17 Loop Inconsistent

VLAN0106 GigabitEthernet3/17 Loop Inconsistent

VLAN0135 GigabitEthernet3/17 Loop Inconsistent

VLAN0209 GigabitEthernet3/17 Loop Inconsistent

VLAN0211 GigabitEthernet3/17 Loop Inconsistent

VLAN0501 GigabitEthernet3/17 Loop Inconsistent

VLAN0502 GigabitEthernet3/17 Loop Inconsistent

VLAN0503 GigabitEthernet3/17 Loop Inconsistent

VLAN0504 GigabitEthernet3/17 Loop Inconsistent

VLAN0505 GigabitEthernet3/17 Loop Inconsistent

VLAN0506 GigabitEthernet3/17 Loop Inconsistent

VLAN0507 GigabitEthernet3/17 Loop Inconsistent

VLAN0508 GigabitEthernet3/17 Loop Inconsistent

VLAN0509 GigabitEthernet3/17 Loop Inconsistent

VLAN0510 GigabitEthernet3/17 Loop Inconsistent

VLAN0511 GigabitEthernet3/17 Loop Inconsistent

VLAN0601 GigabitEthernet3/17 Loop Inconsistent

VLAN0602 GigabitEthernet3/17 Loop Inconsistent

VLAN0666 GigabitEthernet3/17 Loop Inconsistent

VLAN0911 GigabitEthernet3/17 Loop Inconsistent

This is our core link and it is not passing traffic any more. All traffic is going via the secondary link.

How can i resolve this ?

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s.arunkumar Thu, 11/22/2007 - 20:22

i think its beacuse as loop guard is enabled on the port.Some looping on the lan might have moved the port to loop inconsiatant state. Check for the loops in network and bring back the port to normal operation by manually shut and then up the port..

voiper_99 Fri, 11/23/2007 - 16:24

Can you please show us the output of your log? The command is "sh logging"

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