HP GbE2c manual Spanning Tree port configuration

Table 111 Bridge Spanning Tree Configuration Menu options

Command	Description
mxage <6-40>	Configures the bridge maximum age. The maximum age parameter specifies the maximum time
	the bridge waits without receiving a configuration bridge protocol data unit before it
	reconfigures the STP network. The range is 6 to 40 seconds, and the default is 20 seconds.
	This command does not apply to MSTP. See the “Common Internal Spanning Tree configuration”
	section for more information.
fwd <4-30>	Configures the bridge forward delay parameter. The forward delay parameter specifies the
	amount of time that a bridge port has to wait before it changes from the listening state to the
	learning state and from the learning state to the forwarding state. The range is 4 to 30 seconds,
	and the default is 15 seconds.
	This command does not apply to MSTP. See the “Common Internal Spanning Tree configuration”
	section for more information.
cur	Displays the current bridge STP parameters.

When configuring STP bridge parameters, the following formulas must be used:

•2*(fwd-1)> mxage

•2*(hello+1) < mxage

Spanning Tree port configuration

Command: /cfg/l2/stp <1-32>/port <port number>

[Spanning Tree Port 1 Menu]

prior	- Set port Priority (0-255)
cost	- Set port Path Cost (1-65535 (802.1d) /
	1-200000000 (MSTP/RSTP)/0 for auto)
link	- Set port link type (auto, p2p, or shared; default: auto)
edge	- Enables or disables this port as an edge port
fastfwd	- Enable/disable Port Fast Forwarding mode
on	- Turn port's Spanning Tree ON
off	- Turn port's Spanning Tree OFF
cur	- Display current port Spanning Tree parameters

By default for STP/PVST+, Spanning tree is turned Off for downlink ports (1-16), and turned On for cross-connect ports (17-18), and uplink ports (20-24). By default for RSTP/MSTP, Spanning tree is turned On for all downlink ports (1-16), all cross-connect ports (17-18), and all uplink ports (20-24), with downlink ports configured as Edge ports.

Spanning tree port parameters are used to modify STP operation on an individual port basis. STP port parameters include:

•Port priority

•Port path cost

The following table describes the Spanning Tree Port Configuration Menu options.

Table 112 Spanning Tree Port Configuration Menu options

Command	Description
prior <0-255>	Configures the port priority. The port priority helps determine which bridge port
	becomes the designated port.
	In a network topology that has multiple bridge ports connected to a single segment,
	the port with the lowest port priority becomes the designated port for the segment.
	The range is 0 to 255, and the default is 128.
	RSTP/MSTP: The range is 0 to 240, in steps of 16 (0, 16, 32...) and the default is
	128.
cost <1-200000000>	Configures the port path cost. The port path cost is used to help determine the
	designated port for a segment. Generally speaking, the faster the port, the lower the
	path cost.
	The range is 1 to 65535. The default is 10 for 100Mb/s ports, and 1 for Gigabit
	ports. A value of 0 indicates that the default cost will be computed for an auto-
	negotiated link speed.
	RSTP/MSTP: The range is 1 – 200000000, and the default it 20000 for Gigabit
	ports.
	Configuration Menu 117