Terminology - HP PROCURVE 2610 Advanced Traffic Management Manual

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
further away from the STP root device. For example, port "C" in figure 5-12, above, is a
(downstream port)
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
device. For example, ports "A" and "B" in figure 5-12 on page 32 are uplink ports.
(upstream port)
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
to transition to forwarding. In a normal spanning tree environment, this
transition is usually 30 seconds (with the
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.)
Port 3
4
Switch
(2610-Edge)
Port 5
Figure 5-13. Example of an Edge Switch in a Topology Configured for STP Fast Uplink
(2 x (forward delay) + link down detection)
2
Switch
6
8
3
Switch
1
Spanning-Tree Operation
802.1D Spanning-Tree Protocol (STP)
parameter set to its
Forward Delay
1
Switch
(Root)
Link blocked by STP:
LAN
5-33