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 

[EXTR_Paul]

This is a common problem in switches that are PHYless, like the VSP7400.  When you put a 1GE transceiver into a SFP+ or SPF28 port, the port doesn't know what speed to set itself at.

Try these three things

1-.   Disable auto-negotiation on the cisco side port.  leave auto-neg enabled on the Extreme side

2- Do the opposite.   Disable auto-neg on the VSP7400 port. Enable auto-neg on the Cisco. 

3- Disable auto-neg on both sides.

One of those three scenarios will work.

[RobertD1 · Accepted solution]

Just updating this post to let people know it is now working after a reboot of the Cisco switch. We suspected the Cisco because even a local PC failed to connect to it in a simple access mode configuration. Local engineer felt a reboot would clear the issue as he had seen this behaviour before where after a period of up time a port goes down and up again it fails to work. After rebooting can now connect a PC or connect it to another switch. Nothing to do with the Extreme side. The link works at 1G with auto-negotiate enabled.

[WillyHe]

Maybe a good idea to replace the Cisco by an EXTREME switch 🙂

[RobertD1]

Do I need to configure the port to advertise full 1000?

show int gig l1-config 1/42
************************************************************************************
Command Execution Time: Wed May 22 17:47:01 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

auto-negotiation-advertisements ?
10-full Advertise 10mbps full duplex
10-half Advertise 10mbps half duplex
100-full Advertise 100mbps full duplex
100-half Advertise 100mbps half duplex
1000-full Advertise 1000mbps full duplex
10000-full Advertisement 10Gbps full duplex
2500-full Advertise 2.5Gbps full duplex
25000-full Advertisement 25Gbps full duplex
5000-full Advertise 5Gbps full duplex
none Set to none
port Port(s) which are to be changed

Edit: Not supported!

auto-negotiation-advertisements 1000-full
Error: port 1/42, Custom Auto Negotiation Advertisements are not supported