Nortel Networks 40M2420 manual 16Spanning Tree Parameter Descriptions

Alteon OS Command Reference

The switch software uses the IEEE 802.1d Spanning Tree Protocol (STP). In addition to seeing if STG is enabled or disabled, you can view the following STG bridge information:

„Priority

„Hello interval

„Maximum age value

„Forwarding delay

„Aging time

You can also see the following port-specific STG information:

„Slot number

„Port alias and priority

„Cost

„State

The following table describes the STG parameters.

Table 4-16Spanning Tree Parameter Descriptions

Parameter	Description
Priority (bridge)	The bridge priority parameter controls which bridge on the network will
	become the STG root bridge.
Hello	The hello time parameter specifies, in seconds, how often the root bridge
	transmits a configuration bridge protocol data unit (BPDU). Any bridge that
	is not the root bridge uses the root bridge hello value.
MaxAge	The maximum age parameter specifies, in seconds, the maximum time the
	bridge waits without receiving a configuration bridge protocol data unit
	before it reconfigure the STG network.
FwdDel	The forward delay parameter specifies, in seconds, the amount of time that a
	bridge port has to wait before it changes from learning state to forwarding
	state.
Aging	The aging time parameter specifies, in seconds, the amount of time the
	bridge waits without receiving a packet from a station before removing the
	station from the Forwarding Database.
priority (port)	The port priority parameter helps determine which bridge port becomes the
	designated port. In a network topology that has multiple bridge ports con-
	nected to a single segment, the port with the lowest port priority becomes the
	designated port for the segment.

40M2420, April 2007 Chapter 4: The Information Menu „ 83