Figure 43 Path Cost Arbitration Example - Nortel business policy switch 2000 User Manual

142 Chapter 2 Network configuration
LAN speed, in Mb/s). Another three-port trunk (T2) is configured with an
aggregate bandwidth of 210 Mb/s, with a comparable Path Cost of 4. When the
Path Cost calculations for both trunks are equal, the software chooses the trunk
with the larger aggregate bandwidth (T1) to determine the most efficient path.
Also, the trunk cannot span multiple spanning tree groups.

Figure 43 Path Cost arbitration example

S1
100 Mb/s
100 Mb/s
Path Cost T1 = 4
10 Mb/s
10 Mb/s
Aggregate Bandwidth
220 Mb/s
S2
The switch can also detect trunk member ports that are physically misconfigured.
For example, in
configured correctly to trunk member ports 7, 9, and 11 of Switch S2. The
Spanning Tree Port Configuration screen for each switch shows the port state field
for each port in the Forwarding state.
208700-C
T1
Figure 44, trunk member ports 2, 4, and 6 of Switch S1 are
Business
Business Policy Switch 2000
Policy Switch 2000
100 Mb/s
100 Mb/s
10 Mb/s
T2
Aggregate Bandwidth
210 Mb/s
Business
Business Policy Switch 2000
Policy Switch 2000
Path Cost T2 = 4
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