Connexion issue between C9200L-48T-4G and AT-x930-28GSTX

[julien denis5]

Dear experts,
Can anyone tell me a solution to make the 1G trunk links work between an AT-x930-28GSTX and C9200L-48T-4G ?

The port goes up on the Cisco side, however, it does not go up on the Allied Telesis side.

The AT-x930-28GSTX is a level 3 switch, used in the core network, with firmware version: 5.5.3-1.1. While the C9200L-48T-4G is a level 2 switch, used for endpoint subscribers, with iosxe firmware version: 17.09.04.

My other Cisco Layer 2 switches have no difficulty setting up a 1G optical trunk link with the AT-x930 Layer 3 switch :
- WS-C2960CX-8TC (v.15.2(7)E8)
- WS-C2960X-24TS-L (v.15.2(7)E8)
- WS-C2960X-48TS-L (v.15.2(7) )E8).

The only configurations allowing the establishment of the trunk link between the C9200L-48T-4G and the AT-x930-28GSTX are as follows:
- copper connection with 2 SFP modules for twisted pairs
- optical link with 2 100M multimode SFP modules

All SFP modules used are proprietary brand, there are no generics.

Do you have any ideas to guide me in this troubleshooting?

Thank you very much !

[marce1000]

         - Check logs on both devices when a connection attempt is being made .

 M.

[julien denis5]

Hello,
Looking at the logs didn't help me.
However, I managed to obtain good results by setting the port speed to 1Gi and the duplex to full on the Allied Telesis x930 side.

Thks