LACP time to converge

[p-coelho]

Hi,

I have two stack switch between to different sites and I have a problem with an Etherchannel LACP connection.

I have two Etherchannel Gb connections between the 4 switchs stack and when I loose one of the connections it takes aprox 60 seconds to recover the connection between the sites.

I can´t find any command that can reduce this time. Exist any command to reduce this time.

What I can see in the configuration is :

Switch 1

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(P)

Switch 2

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(P)

When one of the ports goes down

Switch 1

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(D)

Switch 2

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(P)

After 60 seconds

Switch 1

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(D)

Switch 2

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(w)

The LACP partner is ok and the only thing that I can see is that the Age of the port that goes down grows when the remote ports goes down.

Best Regards

Paulo Coelho

[moj_ccie]

Hello, These features & commands will help you:

- switchport nonegotiate ( Reduce DTP Time)

- spanning-tree portfast or spanning-tree portfast edge (on Interface and Portgroup)

- lacp rate fast (Fast Mode)

[MHM Cisco World]

When one of the ports goes down

Switch 1

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(D)

Switch 2

11     Po11(SU)        LACP      Gi1/0/12(P) Gi2/0/28(P)

this cause because the L1 is not detect the down of Peer, but STP detect loop and all etherchannel pass phases of STP. 

https://study-ccnp.com/cisco-lacp-link-aggregation-control-protocol/

check this link for lacp fast, lacp fast is the best solution for your case.