Installation manual

3-170
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• Admin Link Type – The link type attached to this interface.
- Point-to-Point – A connection to exactly one other bridge.
- Shared – A connection to two or more bridges.
- Auto – The switch automatically determines if the interface is attached to a
point-to-point link or to shared media. (This is the default setting.)
• Admin Edge Port (Fast Forwarding) – You can enable this option if an interface is
attached to a LAN segment that is at the end of a bridged LAN or to an end node. Since
end nodes cannot cause forwarding loops, they can pass directly through to the
spanning tree forwarding state. Specifying Edge Ports provides quicker convergence for
devices such as workstations or servers, retains the current forwarding database to
reduce the amount of frame flooding required to rebuild address tables during
reconfiguration events, does not cause the spanning tree to initiate reconfiguration when
the interface changes state, and also overcomes other STA-related timeout problems.
However, remember that Edge Port should only be enabled for ports connected to an
end-node device. (Default: Disabled)
• Migration – If at any time the switch detects STP BPDUs, including Configuration or
Topology Change Notification BPDUs, it will automatically set the selected interface to
forced STP-compatible mode. However, you can also use the Protocol Migration button
to manually re-check the appropriate BPDU format (RSTP or STP-compatible) to send
on the selected interfaces. (Default: Disabled)
• BPDU Flooding - Enables/disables the flooding of BPDUs to other ports when global
spanning tree is disabled (page 3-161) or when spanning tree is disabled on specific
port. When flooding is enabled, BPDUs are flooded to all other ports on the switch or to
all other ports within the receiving port’s native VLAN as specified by the Spanning Tree
BPDU Flooding attribute (page 3-161).
Table 3-14 Default STA Path Costs
Port Type Link Type IEEE 802.1w-2001
Ethernet Half Duplex
Full Duplex
Trunk
2,000,000
1,000,000
500,000
Fast Ethernet Half Duplex
Full Duplex
Trunk
200,000
100,000
50,000
Gigabit Ethernet Full Duplex
Trunk
10,000
5,000