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Thursday, April 7, 2011

Does sfp's require special configuration ?or do just need to plug and play ?

Qsolved Question: We have the following scenario . Access layer switches are connected via fiber to core switch .

1) Does sfp's require special configuration ?or do just need to plug and play ?

2) core-sw----------------------access-layer switches .we have four vlans 192.168.1.0 - 192.168.4.0 and four switches reserved for each vlan . what is the best practice should we configure them as trunk port or access ports ?

Qsolved Answer:

1) SFPs are hardware devices and operate at Layer1. You don't need any special configuration for them as long as they are compatible with your switch. [Some take GBICs, you know !]. The only configuration change that might be required is Speed/Duplex settings. While you can change Speed/Duplex on copper ports, SFP does not. They only support "speed negotiate" and "Speed Non negotiate". So, if the line is not up, make sure to flip the cable since they have different xmit and receive ends.

2) Depends on your topology. If you want redundancy, then I would say go ahead and trunk and use appropriate load balancing with an appropriate Layer2 protocol. Ether channels would do the job, wherever required

SFP are plug and play.If you are planning to extend your L2 from the access switches to the Core, and you have multiple Vlans, you must trunk on the port.

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