Configuration of 3550 Switch

[dawezal]

I have two 3550 switches that I have created a ether-channel between them. I am trying to create some transparent redundancy. Is there anyway to configure one portion of the link to become active immediately if the primary link goes down.

As it stands now, when I shutdown or unplug one trunk the other one does kick into action but it takes about 30 seconds to do so then drops for another 30 seconds when the primary link is restored. Is this the default settings or can I decrease that down time.


Thanks for any information

 

[VinceWhirlwind]

It sounds like the etherchannel isn't active.

Can you post the config for each of the 4 physical interfaces and the two port-channel interfaces for us to have a look at?

 

[dawezal]

Here is the current configurations on both switches. Thanks again.


First switch


interface Port-channel1
switchport trunk encapsulation d
switchport mode trunk
!
interface Port-channel1.1
!
interface FastEthernet0/1
switchport trunk encapsulation d
switchport mode trunk
pagp learn-method physical-port
channel-group 1 mode auto
channel-protocol pagp
spanning-tree portfast trunk
!
interface FastEthernet0/2
switchport trunk encapsulation d
switchport mode trunk
pagp learn-method physical-port
channel-group 1 mode auto
channel-protocol pagp
spanning-tree portfast trunk


2nd Switch

Password:
turnlab2#sh run
Building configuration...

Current configuration : 4189 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname turnlab2
!
enable password turn
!
ip subnet-zero
ip routing
!
no ip domain-lookup
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
!
interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Port-channel1.1
!
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
pagp learn-method physical-port
channel-group 1 mode auto
channel-protocol pagp
spanning-tree portfast trunk
!
interface FastEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
pagp learn-method physical-port
channel-group 1 mode auto
channel-protocol pagp
spanning-tree portfast trunk

 

[vipergg]

The channel can't be working you have bopth sides as auto for the port chaqnnel and it cannot come up in that configuration , one side must be desirable for a negotiated pagp etherchannel . One side should be "channel group 1 mode desirable non-silent" .

 

[dawezal]

Thanks..Works fine...