Please assits EtherChannel Configuration

[Supertech905]

Hi

I need some information

If i configure etherchannel form my L2 switch that is 3750 to L3 switche that is 3550 , so I need some down time or not

here is the configuration

3750

# int po1

# switchport trunk encapsulation dot 1q

# switchport mode trunk

#i int gig 1/0/2

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# channel-group1 mode on

3750

# int po1

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# int gig 1/0/2

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# channel-group1 mode on

# int gig 1/0/3

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# channel-group1 mode on

3550

# int po1

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# int gig 0/2

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# channel-group1 mode on

# int gig 0/10

# switchport trunk encapsulation dot 1q

# switchport mode trunk

# channel-group1 mode on

Note: 3750 switches are configure as stack

Thanks

[Giuseppe Larosa]

Hello Muhammad,

I suppose from other your thread you already have between the C3750 stack and the C3550.

You can start by configuring the two additional links first in shut on both ends.

You can then do no shut both sides using the working still stand alone link.

After STP convergence you verify the bundle with

sh etherchannel summary

sh cdp n

you can shut the standalone link both ends add the command channel-group1 mode on then renable it on both sides.

I would use LACP instead of on mode as a protection mechanism

to use LACP you don't configure the port-channel interface and you use

port-channel mode active.

However, you need to check if the C3550 supports LACP and also if it supports it the commands can be different

You need a maintanance time window for safety.

Hope to help

Giuseppe