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PANNING
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ONFIGURATION
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The following interface attributes can be configured:
• Priority – Defines the priority used for this port in the Spanning Tree
Protocol. If the path cost for all ports on a switch are the same, the port
with the highest priority (i.e., lowest value) will be configured as an
active link in the Spanning Tree. This makes a port with higher priority
less likely to be blocked if the Spanning Tree Protocol is detecting
network loops. Where more than one port is assigned the highest
priority, the port with lowest numeric identifier will be enabled.
- Default: 128
- Range: 0 - 255
• Path Cost – This parameter is used by the STP to determine the best
path between devices. Therefore, lower values should be assigned to
ports attached to faster media, and higher values assigned to ports with
slower media. (Path cost takes precedence over port priority.)
• Full Range: 1-65535
• Recommended Range –
- Ethernet: 50-600
- Fast Ethernet: 10-60
- Gigabit Ethernet: 3-10
•Defaults –
- Ethernet – half duplex: 100; full duplex: 95; trunk: 90
- Fast Ethernet – half duplex: 19; full duplex: 18; trunk: 15
- Gigabit Ethernet – full duplex: 4; trunk: 3
• Fast Forwarding – Since end-nodes cannot cause forwarding loops,
they can be pass directly through to the forwarding state. Fast
Forwarding can achieve quicker convergence for end-node
workstations and servers, and also overcome other STA related
timeout problems. (Remember that Fast Forwarding should only be
enabled for ports connected to an end-node device.)
- Default is disabled
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