Nortel business policy switch 2000, User Manual

Page: 141 / 412

Chapter 2 Network configuration 141
Using the Business Policy Switch 2000 Version 2.0
Figure 42 Loss of distributed trunk members
However, until you correct the cause of the failure or change the trunk Status field
to Disabled, you will be unable to modify any of the following parameters for the
affected trunk:
• VLAN configuration
• Spanning Tree configuration
• Port Mirroring configuration
• Port configuration
• IGMP configuration
• Rate Limiting configuration
Spanning tree considerations for MultiLink Trunks
The spanning tree Path Cost parameter is recalculated based on the aggregate
bandwidth of the trunk. For example,
Figure 43 shows a four-port trunk (T1) with
two port members operating at 100 Mb/s and two at 10 Mb/s. Trunk T1 provides
an aggregate bandwidth of 220 Mb/s. The Path Cost for T1 is 4 (Path Cost = 1000/
Unit 2
Unit 3
Unit 4
Unit 1
9843EA
T1
Business Policy Switch 2000
Unit 6
Unit 7
Unit 8
Unit 5
BPS2000 MDA
BPS2000
MDA
BPS2000 MDA
BPS2000 MDA
Accelar 1150/1150R
Routing Switch
(XLR1102SR
I/O Modules)
CPU PS1 PS2 FAN