VSP-7400-48Y-8C (8.8.3.0) to Cisco WS-C3750X-24S-S 1G Not Working

[RobertD1]

Hello,

Tried initially with 1G SFP and fibre at both ends and link does not come up. Cannot disable auto-negotiate on Cisco 1G SFP (IOS version does not support it). So, link does not work because auto-negotiation is disabled when insert a 1G SFP into the Extreme 7400 port.

We then tried with a 1000BaseT copper transceiver and a straight cable but the link did not come up. The Extreme side shows the port is using auto-negotiation so we configured the Cisco end to auto-negotiate but the link is down. 

Not sure if the 1000BaseT copper module used in 7400 port supports Auto MDI-X? Do we need to use a crossover cable? 

show int gig l1-config 1/42
************************************************************************************
Command Execution Time: Wed May 22 11:35:49 2024 BST
************************************************************************************
==================================================================================================================================
Port Config L1
==================================================================================================================================
PORT AUTO OPERATE CUSTOM AUTO NEGOTIATION CANA ADMIN OPERATE ADMIN OPERATE
NUM NEG. AUTO-NEG ADVERTISEMENTS ORIGIN DPLX SPD DPLX SPD TX-FLW-CTRL TX-FLW-CTRL
----------------------------------------------------------------------------------------------------------------------------------
1/42 true true 10000F 25000F CONFIG full 25000 full 1000 disable disable

Anyone managed to get a 1G copper connection from Extreme 7400-48Y-8C to Cisco Catalyst switch working?

Rob 

[RobertD1]

It might be because the 7400 uses a phy-less design and Auto-MDIX is not able to detect the cabling. Will see if a cross-over cable works.

[WillyHe]

See "https://documentation.extremenetworks.com/pluggable/GUID-768962A7-424B-424A-9FB2-DDFBFF5364DE.shtml"...

[WillyHe]

This link should work, its the same but not.
https://documentation.extremenetworks.com/pluggable/GUID-768962A7-424B-424A-9FB2-DDFBFF5364DE.shtml

[akrohn]

Hello Rob,

which of this copper modules do you use ?

https://optics.extremenetworks.com/VSP/Model/VSP740048Y/Copper/Bitrate/1G/

The only limitations I found are :

1G Limitations

-No support for Auto-Negotiation

-The system does not support auto-negotiation when the port is operating at 1G

-Console Informational Log Message:

• Auto-Negotiation enabled but not applied to port 1/1 since 1G transceiver is present

-No support for Remote Fault Indication (RFI). RFI requires Auto-Negotiation which is not supported.

-No support for TX Pause Frames

-Receive pause frames are honored

Not capable of generating Tx Pause Frames

You can check this easy.

Connect a pc with fix 1000base-t settings with a normal cat cable to the switch.

When you get a link, you know the cable type.

Best regards

Andreas

[RobertD1]

Hi Andreas,

Thanks for your reply. It is an Extreme Gbic1000BaseT (compatible with 10070H). The configured and operating auto-negotiate setting is True. Even though it is showing auto-negotiate true it is not negotiating. We are going to try with a crossover cable next. Nothing in log to say anything about Auto-Negotiation being enabled and not applied.  I did try disabling auto-negotiation but the operating setting remained True when the Cisco side was fixed but no joy. It would be good to understand if MDIX is supported on pluggable modules so we know we need to change the cable. 

Thanks,

Rob