• Remove 2 SFPs from the existing management switches Eg: ports xe-0/2/0 and xe-0/2/1 in NB and BB (SFP model: EX-SFP-10GE-SR).

• Insert 2 new SFPs into the existing management switch to ports xe-0/2/0 and xe-0/2/1 in NB and BB (SFP model: EX-SFP-1GE-T).

• Connect the 2 newly inserted SFPs to 2 different core switches per DC in NB and BB using standard RJ-45 patch cords. Port xe-0/2/0 and xe-0/2/1 on MGMT switch to port ge-0/0/22 and ge-1/0/22 on core switch.

Child interface is not visible under aggregated interface on MGMT EX3400 switch when replacing the SFP from EX-SFP-10GE-SR to EX-SFP-1GE-T.

After replacing the SFP from EX-SFP-10GE-SR to EX-SFP-1GE-T, the interface name will also change from "xe" to "ge".

To fix the issue, we need to change / add the child interface from xe-0/2/0, xe-0/2/1 to ge-0/2/0 and ge-0/2/1 under the aggregate interface configuration. Post that LACP will come UP on both ends.

We can verify using below command output on both ends:

>show lacp interfaces <aggregate interface name>
>show interfaces terse | match <aggregate interface name>

2024-07-15: Article validated
2024-07-10 : Article Created