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Ether-Channel Down

Hii Guys.

Faced a strange problem today with Ether-Channel conectivity. My two Cisco 4507 connected with two STM links(following different path) on two Gig interface bundled with Ether-channel.

Today, Suddenly switch went unreachable and reachable after shuting one Gig STM port.trying to understand why this so, If there is ethernet created(all configs fine for etherchannel)then switch should not be un-reachable unless both STM connectivity go down or If either STM go down traffic should be on another STM . Have taken latest logs from ether-channel.

Cisco_4507#sh etherchannel detail

Channel-group listing:

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

Group: 1

----------

Group state = L2

Ports: 2 Maxports = 8

Port-channels: 1 Max Port-channels = 1

Protocol: -

Ports in the group:

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

Port: Gi3/2

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

Port state = Up Mstr In-Bndl

Channel group = 1 Mode = On/FEC Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = -

Age of the port in the current state: 00d:00h:40m:52s

Port: Gi3/3

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

Port state = Up Mstr In-Bndl

Channel group = 1 Mode = On/FEC Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 1 Load = 0x00 Protocol = -

Age of the port in the current state: 00d:00h:41m:05s

Port-channels in the group:

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

Port-channel: Po1

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

Age of the Port-channel = 49d:17h:02m:47s

Logical slot/port = 11/1 Number of ports = 2

GC = 0x00000000

Port state = Port-channel Ag-Inuse

Protocol = -

Ports in the Port-channel:

Index Load Port EC state No of bits

------+------+------+------------------+-----------

1 00 Gi3/3 On/FEC 0

0 00 Gi3/2 On/FEC 0

Time since last port bundled: 00d:00h:40m:53s Gi3/2

Time since last port Un-bundled: 00d:00h:41m:00s Gi3/2

Cisco_4507#

Requesting you to please help me to understand the root cause of problem.

Regards

2 REPLIES
Silver

Re: Ether-Channel Down

Ether-channel problem may occur because of mismatched parameters on the ports that are involved (for example, different speeds, different duplex, or different STP port values).

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a00800949c2.shtml#tshoot

New Member

Re: Ether-Channel Down

Hi

Sudhir,

Try to check UDLD or do "errdisable recovery "

HTH

DAK

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