ProCurve 2610-PWR Technical Information download pdf (Page 142)

Spanning-Tree Operation

802.1D Spanning-Tree Protocol (STP)

In figure 5-13, STP is enabled and in its default configuration on all switches,

unless otherwise indicated in table 5-5, below:

Table 5-5. STP Parameter Settings for Figure 5-13

STP Parameter Switch “1” Switch “2” Switch “3” Switch “4”

Switch Priority 0

32,768 (default) 32,768 (default)

(Fast) Uplink No No No Ports 3 & 5

This setting ensures that Switch “1” will be the primary root switch for STP in figure 5-13.

This setting ensures that Switch “2” will be the backup root switch for STP in figure 5-13.

With the above-indicated topology and configuration:

■ Scenario 1: If the link between switches “4” and “2” goes down, then the

link between switches “4” and “3” will begin forwarding in as little as ten

seconds.

■ Scenario 2: If Switch “1” fails, then:

• Switch “2” becomes the root switch.

• The link between Switch “3” and Switch “2” begins forwarding.

• The link between Switch “2” and the LAN begins forwarding.

Operating Rules for Fast Uplink

■ A switch with ports configured for fast uplink must be an edge switch and

not either an interior switch or the STP root switch.

Configure fast-uplink on only the edge switch ports used for providing

redundant STP uplink connections in a network. (Configuring Fast-Uplink

STP on ports in interior switches can create network performance prob-

lems.) That is, a port configured for STP uplink should not be connected

to a switch that is sequentially further away from the STP root device. For

example, switch “4” in figure 5-13 (page 5-33) is an edge switch.

■ Configure fast uplink on a group (two or more) of redundant edge-switch

uplink ports where only one port in the group is expected to be in the

forwarding state at any given time.

5-34

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ProCurve 2610-PWR Technical Information Page 142