ProCurve 2610-PWR Technical Information download pdf (Page 141)

Spanning-Tree Operation

802.1D Spanning-Tree Protocol (STP)

Terminology

Term Definition

downlink port A switch port that is linked to a port on another switch (or to an end node) that is sequentially

(downstream port)

further away from the STP root device. For example, port “C” in figure 5-12, above, is a

downlink port.

edge switch For the purposes of fast-uplink STP, this is a switch that has no other switches connected to

its downlink ports. An edge switch is sequentially further from the root device than other

switches to which it is connected. Also termed wiring closet switch or leaf switch. For

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

interior switch In an STP environment, a switch that is sequentially closer to the STP root device than one

or more other switches to which it is connected. For example, switches “1”, “2”, and “3” in

figure 5-13 (page 33) are interior switches.

single-instance spanning A single spanning-tree ensuring that there are no logical network loops associated with any

tree of the connections to the switch, regardless of whether there are any VLANs configured on

the switch. For more information, see “Spanning Tree Protocol (STP)” in chapter 9,

“Configuring Advanced Features”, in the Management and Configuration Guide for your

switch.

uplink port A switch port linked to a port on another switch that is sequentially closer to the STP root

(upstream port)

device. For example, ports “A” and “B” in figure 5-12 on page 32 are uplink ports.

wiring closet switch Another term for an “edge” or “leaf” switch.

When single-instance spanning tree (STP) is running in a network and a

forwarding port goes down, a blocked port typically requires a period of

(2 x (forward delay) + link down detection)

to transition to forwarding. In a normal spanning tree environment, this

transition is usually 30 seconds (with the

Forward Delay parameter set to its

default of 15 seconds). However, by using the fast-uplink spanning tree

feature, a port on a switch used as an edge switch can make this transition in

as little as ten seconds. (In an STP environment, an edge switch is a switch

that is connected only to switches that are closer to the STP root switch than

the edge switch itself, as shown by switch “4” in figure 5-13, below.)

Switch 4

(2610-Edge)

Switch 3

Switch 1

(Root)

Switch 2

Port 3

Port 5

Link blocked by STP:

LAN

Figure 5-13. Example of an Edge Switch in a Topology Configured for STP Fast Uplink

5-33

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