ProCurve 2610-PWR Technical Information download pdf (Page 143)

Spanning-Tree Operation

802.1D Spanning-Tree Protocol (STP)

■ Edge switches cannot be directly linked together using fast-uplink ports.

For example, the connection between switches 4 and 5 in figure 5-14 is

not allowed for fast-uplink operation.

Switch 4

(5304-Edge)

Switch 3

Switch 1

(Root)

Switch 2

Link blocked by STP:

LAN

Switch 5

(5304-Edge)

The ports

that make up

this link

cannot be

configured

as fast-

uplink ports.

Figure 5-14. Example of a Disallowed Connection Between Edge Switches

■ Apply fast-uplink only on the uplink ports of an edge switch. For example,

on switch “4” (an edge switch) in figure 5-14 above, only the ports

connecting switch “4” to switches “2” and “3” are upstream ports that

would use fast uplink. Note also that fast uplink should not be configured

on both ends of a point-to-point link, but only on the uplink port of an edge

switch.

■ Ensure that the switch you intend as a backup root device will in fact

become the root if the primary root fails, and that no ports on the backup

root device are configured for fast-uplink operation. For example, if the

STP Priority is the same on all switches—default: 32768—then the switch

with the lowest MAC address will become the root switch. If that switch

fails, then the switch with the next-lowest MAC address will become the

root switch. Thus, you can use STP Priority to control which switch STP

selects as the root switch and which switch will become the root if the

first switch fails.

■ Fast-Uplink STP requires a minimum of two uplink ports.

Menu: Viewing and Configuring Fast-Uplink STP

You can use the menu to quickly display the entire STP configuration and to

make any STP configuration changes.

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