3Com 7600 Parameters in -4 are set for individual bridge ports, 4Port-dependent bridge parameters

Bridged-LAN Environments in the 7600 Card 11-11

Management Bridge The following bridge parameters can be set by management. The Parameters parameters listed in Table 11-3, are port-independent while the

parameters in Table 11-4 are set for individual bridge ports.

Table 11-3Port-independent Bridge Parameters

Parameter	Description
Bridge-priority	A 2-octet value that allows the network manager to influence the choice of root bridge and
	the designated bridge. It is appended as the most significant portion of a bridge ID. It can
	also detect the case where two or more ports on the same bridge are attached to the same
	LAN, i.e. are in direct communication through a path of bridged LAN components, none of
	which operate the STP.
Bridge-hello-time	The time that elapses between generation of CBPDUs by a bridge that assumes itself to be
	the root bridge. It is also the time interval between transmissions of Topology Change
	Notification BPDUs to the root bridge when the bridge is trying to communicate a topology
	change to the designated bridge on the LAN to which its Root Port is attached. The
	recommended time is 2 secs.
Bridge-max-age	The message age value at which a stored CBPDU is discarded. The value recommended in
	802.1d is 20 secs.
Bridge-forward-delay	A parameter that prevents a bridge from forwarding data packets until the changes in the
	spanning tree have been completed throughout the network. It is the time spent in the
	Listening State and the Learning State. It is also used for the aging time of dynamic entries in
	the Filtering Database while the Topology Change flag is set in protocol messages received
	from the root. The value recommended in 802.1d is 15 secs.
Bridge-aging-time	Dynamic station addresses are discarded from the FDB when no data is received from the
	station for bridge-aging-time. Static addresses with a delete-on-timeout status are also
	discarded after Bridge-aging-time. Recommended default: 5 min.

Table 11-4Port-dependent bridge parameters

Parameter	Description
Bridge-port-priority	A 1-octet value that allows the network manager to influence the choice of port when a
	bridge has two ports connected in a loop. It is appended as the most significant portion of
	the port ID.
Bridge-path-cost	The cost to be added to the root path cost field to determine the cost of the path to the root
	through this port. The larger the value for the path-cost, the less through traffic the LAN
	reached through the port will carry.

Bridged-LANThe 7600 Card provides a flexible, user-defined bridging capability Environments in the designed to support local bridged-LAN environments of different sizes.

7600 Card