Nortel 2000, Using Manual

Page: 136 / 405

136 Chapter 2 Network configuration
208700-B
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
The switch can also detect trunk member ports that are physically misconfigured.
For example, in
Figure 44 , trunk member ports 2, 4, and 6 of Switch S1 are
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.
9807EA
T1 T2
100 Mb/s
100 Mb/s
10 Mb/s
100 Mb/s
100 Mb/s
10 Mb/s
10 Mb/s
Path Cost T1 = 4
S1
S2
Path Cost T2 = 4
Aggregate Bandwidth
220 Mb/s
Aggregate Bandwidth
210 Mb/s
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