ProCurve 2610-PWR Technical Information download pdf (Page 157)

Spanning-Tree Operation

802.1s Multiple Spanning Tree Protocol (MSTP)

Caution When you enable MSTP on the switch, the default MSTP spanning tree

configuration settings comply with the values recommended in the IEEE

802.1s Multiple Spanning Tree Protocol (MSTP) standard. Note that inappro-

priate changes to these settings can result in severely degraded network

performance. For this reason, ProCurve strongly recommends that changing

these default settings be reserved only for experienced network administra-

tors who have a strong understanding of the IEEE 802.1D/w/s standards

and operation.

How MSTP Operates

In the factory default configuration, spanning tree operation is off. Also, the

switch retains its currently configured spanning tree parameter settings when

disabled. Thus, if you disable spanning tree, then later re-enable it, the param-

eter settings will be the same as before spanning tree was disabled. The switch

also includes a “Pending” feature that enables you to exchange MSTP config-

urations with a single command. (Refer to “Enabling an Entire MST Region at

Once or Exchanging One Region Configuration for Another” on page 5-72.)

Note The switch automatically senses port identity and type, and automatically

defines spanning-tree parameters for each type, as well as parameters that

apply across the switch. Although these parameters can be adjusted, ProCurve

strongly recommends leaving these settings in their default configurations

unless the proposed changes have been supplied by an experienced network

administrator who has a strong understanding of the IEEE 802.1D/w/s

standards and operation.

MST Regions

All MSTP switches in a given region must be configured with the same VLANs.

Also, each MSTP switch within the same region must have the same VLAN-to-

instance assignments. (A VLAN can belong to only one instance within any

region.) Within a region:

■ All of the VLANs belonging to a given instance compose a single, active

spanning-tree topology for that instance.

■ Each instance operates independently of other regions.

Between regions there is a single, active spanning-tree topology.

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ProCurve 2610-PWR Technical Information Page 157