SPT best practise

[Sarafianl1980]

Hi,

I'm looking for some direction around SPT best practise.  I'm wondering if its considered to be best practise that a switch should act as a root bridge where the first routable SVI instance is located.  IE. We have vlan 100 on switch A with the best priority sitting alongside the IP SVI vlan 100 so it's all nicely contained on one switch?  I know technically it should not matter since were comparing a L2 and L3 concept but what makes a good standard around this?

Thanks

[brselzer · Accepted solution]

Hello,

I would agree. You want to place your root on the same device as your gateway out of the network. This is because SPT tries to pick the best path to the root which in turn will pick the best path to your gateway. Also, your gateway/root switch tends to be the most powerful switch in your network, however, this isn't always the cast.

Hope that helps!

[Joseph W. Doherty · Accepted solution]

"I'm wondering if its considered to be best practise that a switch should act as a root bridge where the first routable SVI instance is located."

I wouldn't say it's a best practice, but it's often a common practice. It really depends on what your L2 and L3 topologies are. If the are congruent, then having have the root of your STP on the same device as the corresponding L3 gateway, often makes sense.

BTW, often common, if using a FHRP, a backup gateway is also often the secondary root bridge.