Filter
Top Products
160
Enhancements in Release F.02.11
Fast-Uplink Spanning Tree Protocol (STP)
Syntax: spanning-tree e <port/trunk-list> mode uplink Enables STP on the switch and configures
fast-uplink STP on the designated
interfaces (port or trunk).
HP2512(config)# spanning-tree e 1,trk1 mode uplink
Operating Notes
Effect of Reboots on Fast-Uplink STP Operation. When configured, fast-uplink STP operates
on the designated ports in a running Series 2500 switch. However, if the switch experiences a reboot,
the fast-uplink ports (Mode =
Uplink) use the longer forwarding delay used by ports on standard 802.1D
STP (non fast-uplink). This prevents temporary loops that could otherwise result while the switch is
determining the STP status for all ports. That is, on ports configured for fast-uplink STP, the first STP
state transition after a reboot takes the same amount of time as for redundant ports that are not
configured for fast-uplink STP.
Using Fast Uplink with Port Trunks. To use a port trunk for fast-uplink STP, configure it in the
same way that you would an individual port for the same purpose. A port trunk configured for fast
uplink operates in the same way as an individual, non-trunked port operates; that is, as a logical port.
Note
When you add a port to a trunk, the port takes on the STP mode configured for the trunk, regardless
of which STP mode was configured on the port before it was added to the trunk. Thus, all ports
belonging to a trunk configured with
Uplink in the STP Mode field will operate in the fast-uplink mode.
(If you remove a port from a trunk, the port reverts to the STP Mode setting it had before you added
the port to the trunk.
To use fast uplink over a trunk, you must:
1. Create the trunk.
2. Configure the trunk for fast uplink in the same way that you would configure an individual port
for fast uplink.
When you first create a port trunk, its STP Mode setting will be
Norm, regardless of whether one or
more ports in the trunk are set to fast uplink (Mode =
Uplink). You must still specifically configure the
trunk Mode setting to
Uplink. Similarly, if you eliminate a trunk, the Mode setting on the individual
ports in the trunk will return to their previous settings.