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Spanning Tree Config

Posted on 2014-09-17
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Last Modified: 2014-09-18
Hi There,

I'm looking for advice on STP setup. The topology is quite simple for this campus like network. There are multiple buildings on the grounds but all switches, except for a couple of distribution switches, all come back to a data center. (diagram)

In the data center, there is a stack of 5 switches that provide connectivity to the VMware hosts and SAN (iSCSI/LAN), as well as the uplinks to about 30 other switches (LAN). There are about 5 vlans for corporate traffic. Inter-vlan routing is done through direct-connected vlan-interfaces on the "core".

There is no support for SPB or Trill on the core, only STP, RSTP, or MSTP (HP a5800s).

All uplinks to the core are aggregated (2 from each switch). There are not multiple paths per say because everything runs right back to the core although the aggregated links go over different fiber paths for redundancy.

I'm just trying to figure out the spanning tree. While there shouldn't be any loops in this spoke and hub type of topology, i figure you should always have it enabled. I'm wondering a few things:

1. Should i have STP enabled on the core
2. Where is the best place to put the Root Switch? Core? other?
3. Is RSTP fine or should i go with MSTP. If so, do you designate more than one root switch?

thx
simple-diag.pdf
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Question by:Graycon
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Craig Beck earned 500 total points
ID: 40329957
1. Always enable STP - even if you don't have any loops it prevents them being inadvertently introduced in the future.
2. STP should be as central as possible in a star topology.  If all switches come back to one place, that is the best candidate for root.
3. RSTP is fine.  I don't see a need for MSTP in your deployment.
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