asked on

Connecting a Cisco 3750 switch to another 3750 across a layer 2 SM fibre

Hi,

I have to connect a Cisco 3750 to another 3750 across a layer 2 fibre link as the title says. I am looking for any advice on how to make sure the addition of this switch has no detrimental effect on the existing LAN infrastructure as I am working in a financial environment where downtime is unacceptable.

- I have set the switch VTP mode to transparent
- I have set the STP VLAN priority to its highest number so that means the lowest priority so it won't cause a root bridge election
- I have set both switch ports to be trunks, encapsulation dot1q and have disabled STP portfast.

I think that's really about it but I wanted an expert to have a look and consider any other potential issues.

The main one for me apart from the configuration is the single mode fibre actually working end-to-end as it's 17km long and managed by 3 different groups of people....not great.

Thanks a lot for your time,

Ally

ASKER CERTIFIED SOLUTION

Don Johnston

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

ally0000

ASKER

Thanks for the comment, I think I'm ready to go too. Change window is in 2 hours for 3 hours, maybe I can stretch that longer if the fibre link becomes an issue. The system is a payments system so today there are no payments being made and the usage this afternoon is low.

The other thing I can check is the link isn't working is to cross the fibre Tx and Rx as there isn't a record of how each vendor did their end.

Thanks

Ally

Istvan Kalmar

Hi,

Please set vtp domain and vtp password to protect your VLANs!

Best regards,
Istvan

ally0000

ASKER

Istvan,

All the standard config is determined by the bank I am working for.

I had 2 swiches to come online both at the end of a ZX fibre link, about 17km long with 3 vendors. One is OK and one isn't so will deal with that tomorrow.

Thanks for the help today.

Ally