D-Link DSL-G604T Parameter Description Designated Root, Bridge External Root Cost, Root Port

DGS-3024 Gigabit Ethernet Switch Manual

Figure 7- 24. STP Instance Operational Status window – Previously Configured MSTI

The following parameters may be viewed in the STP Instance Operational Status windows:

Parameter	Description
Designated Root	This field will show the priority and MAC address of the Root Bridge.
Bridge
External Root Cost	This defines a metric that indicates the relative cost of forwarding packets to the
	specified port list. Port cost can be set automatically or as a metric value. The
	default value is 0 (auto).
	0 (auto) - Setting 0 for the external cost will automatically set the speed for
	forwarding packets to the specified port(s) in the list for optimal efficiency.
	Default port cost: 100Mbps port = 200000. Gigabit port = 20000.
	value 1-200000000- Define a value between 1 and 200000000 to determine the
	external cost. The lower the number, the greater the probability the port
	will be chosen to forward packets.
Regional Root Bridge	This field will show the priority and MAC address of the Regional (Internal) Root
	Bridge. This MAC address should be the MAC address of the Switch.
Internal Root Cost	This parameter is set to represent the relative cost of forwarding packets to
	specified ports when an interface is selected within a STP instance. The default
	setting is 0 (auto). There are two options:
	0 (auto) - Selecting this parameter for the internalCost will set quickest route
	automatically and optimally for an interface. The default value is derived
	from the media speed of the interface.
	value 1-2000000- Selecting this parameter with a value in the range of 1 to
	2000000 will set the quickest route when a loop occurs. A lower Internal
	cost represents a quicker transmission.
Designated Bridge	This field will show the priority and MAC address of the Designated Bridge. The
	information shown in this table comes from a BPDU packet originating from this
	bridge.
Root Port	This is the port on the Switch that is physically connected to the Root Bridge.

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