From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Jul 23 2003 - 15:46:18 GMT-3
Have you verified that it is an etherchannel problem and not a link
problem or a cable problem?
Remove the etherchannel stuff on both ends and verify each of the
3550-1912 links is stable.
Have you seen this? I have excerpted part of it below.
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v9x/ee_
scg/2addlfet.htm#xtocid11611
Fast EtherChannel Example
This example shows how to enable the Fast EtherChannel feature in
desirable mode, specifies port 27 or port B as the template port for
member-port configuration, and configures the hot-standby port priority
of Fast Ethernet port B to 100.
switch(config)# port-channel mode desirable
switch(config)# port-channel template port fastethernet 0/27
switch(config)# interface fastethernet 0/27
switch(config-if)# pagp-port-priority 100
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
pierreg
Sent: Wednesday, July 23, 2003 2:25 PM
To: ccielab@groupstudy.com
Subject: Link flapping PagP 3550 and 1912 frozen
A- Situation: I am using a 3550 and a 1912 to do PAgp.
B- The problem: flapping links on the 3550, frozen 1912
(1) Cat3550#
09:43:40: PAgP: Fa0/1 is coming Up
09:43:40: PAgP: Fa0/2 is coming Up
09:43:42: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
09:43:42: %LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to up
Cat3550#
09:43:43: PAgP - Fa0/1 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
09:43:43: PAgP - Fa0/2 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
09:43:44: PAgP - Fa0/1 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
09:43:44: PAgP - Fa0/2 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
09:43:45: PAgP - Fa0/1 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
Cat3550#
09:43:45: PAgP - Fa0/2 failed - not my device_id. 0000.0000.0000
000a.8aac.b100
09:43:48: PAgP: Fa0/1 action_a7 is entered
09:43:48: PAgP: Fa0/2 action_a7 is entered
09:43:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/1, changed
state to up
09:43:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/2, changed
state to up
09:43:50: %LINK-3-UPDOWN: Interface Port-channel13, changed state to up
09:43:51: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Port-channel13, changed
state to up
9:44:18: PAgP: Fa0/1 is going Down
09:44:18: PAgP: Fa0/1 action_a1 is entered
09:44:18: PAgP: Fa0/2 is going Down
09:44:18: PAgP: Fa0/2 action_a1 is entered
09:44:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/1, changed
state to down
09:44:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/2, changed
state to down
09:44:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Port-channel13, changed
state to down
09:44:20: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to
down
09:44:20: %LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to
down
(2) As soon as the pagp negotiation starts, the 1912 is unaccessible
and the only way to get to it is to shut down the port on the 3550. When
this is done the switch is still unaccessible for another 30 seconds.
C- The configurations
======================
The 3550
======================
............
!
interface Port-channel13
switchport access vlan 13
switchport mode access
no ip address
!
interface FastEthernet0/1
switchport access vlan 13
switchport mode access
no ip address
shutdown
duplex full
speed 100
pagp learn-method physical-port
channel-group 13 mode auto
!
interface FastEthernet0/2
switchport access vlan 13
switchport mode access
no ip address
shutdown
duplex full
speed 100
pagp learn-method physical-port
channel-group 13 mode auto
!
..................
---------------
The 1912
-------------------
Cat1912#sh run
Building configuration...
Current configuration:
!
!
port-channel preserve-order
port-channel mode desirable
............
interface FastEthernet 0/26
duplex full
!
!
vlan-membership static 13
!
interface FastEthernet 0/27
duplex full
!
!
vlan-membership static 13
!
line console
-
Any suggestions?
Pierre-Alex
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