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marcoshass
Beginner

Hosts stop communication after one link down of a two ports lacp

Hi all,

I've configured lacp between two switches 2960-24TT and I'm using Cisco Packet Tracer version 5.3.0.0088.

I'll need to configure link aggregation in a near future between cisco and different brands of switches so I need to use lacp ...

Below is my configuration:

####################

## Switch0 2960-24TT

en

conf t

int fast 0/1

channel-protocol lacp

channel-group 1 mode active

exit

int fast 0/2

channel-protocol lacp

channel-group 1 mode active

end

write

reload

####################

## Switch1 2960-24TT

en

conf t

int fast 0/1

channel-protocol lacp

channel-group 1 mode active

exit

int fast 0/2

channel-protocol lacp

channel-group 1 mode active

end

write

reload

lacp.png

I hooked two PCs into switch0 fa0/3 and switch1 fa0/3 and they can ping each other. My problem starts when I perform a shutdown in one of the interfaces of switch0, e.x.

en

conf t

int fast 0/1

shut

This shutdown was performed to simulate a link failure but the hosts cannot to communicate to each other anymore :-( .... Shouldn't lacp failover to fa0/2 ??? I mean, the host's traffic should continue over the other interface that is part of lacp without service disruption .... but unfortunately this is not the case ... to reestablish the communication between the hosts I need to perform a "no shut" into the failed interface .....

Could someone help me ?

Is this an issue with packet tracer ?

Thank you very much!

Marcos

1 REPLY 1
ankugarg
Participant

Try doing "sh etherchannel summary" before shutting down the port,to check that etherchannel is actually up with both the ports in P state.

If thats fine,it is probably the packet tracer issue.