From: Joe Martin (jmartin@capitalpremium.net)
Date: Wed Jul 23 2003 - 15:47:47 GMT-3
Pierre-Alex,
The following is from the 3550 Command Ref for the pagp learn-method
command:
Note The Catalyst 3550 supports address learning only on aggregate ports
even though the physical-port keyword is provided in the CLI. The pagp
learn-method and the pagp port-priority interface configuration commands
have no effect on the switch hardware, but they are required for PAgP
interoperability with devices that only support address learning by physical
ports, such as the Catalyst 1900 switch.
When the link partner to the Catalyst 3550 switch is a physical learner, we
recommend that you configure the switch as a physical-port learner by using
the pagp learn-method physical-port interface configuration command and to
set the load-distribution method based on the source MAC address by using
the port-channel load-balance src-mac global configuration command. Use the
pagp learn-method interface configuration command only in this situation.
Perhaps try defaulting the pagp learn-method and see if that works.
HTH,
Joe Martin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
pierreg
Sent: July 23, 2003 12:26 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
=========================
This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:50 GMT-3