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

ally0000
ally0000 used Ask the Experts™
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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
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Instructor
Top Expert 2015
Commented:
I'd say you're ready to go.

Multi-vendor links... Always a lot of fun... not.

Can you do this during a maintenance window? Or after hours when utilization is low?

Author

Commented:
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 KalmarHead of IT Security Division
Top Expert 2010

Commented:
Hi,

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

Best regards,
Istvan

Author

Commented:
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

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