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Configuring Spanning Tree Parameters
Path Cost for Link Aggregate Ports
Physical ports that belong to a link aggregate do not participate in the Spanning Tree Algorithm. Instead,
the algorithm is applied to the aggregate logical link (virtual port) that represents a collection of physical
ports. By default, Spanning Tree is enabled on the aggregate logical link and the path cost value is set to
zero.
If a 32-bit path cost value is in use and the path_cost for a link aggregate is set to zero, the following
default values based on link speed and link aggregate size are used:
Aggregate Size
Link Speed
(number of links)
10 MB
100 MB
1 GB
10 GB
If a 16-bit path cost value is in use and the path_cost for a link aggregate is set to zero, the following
default values based on link speed and link aggregate size are used. Note that for Gigabit ports the aggre-
gate size is not applicable in this case:
Aggregate Size
Link Speed
(number of links)
10 Mbps
100 Mbps
OmniSwitch 6600 Family Network Configuration Guide
Default Path
Cost Value
2
1,200,000
4
800,000
8
600,000
16
400,000
2
120,000
4
80,000
8
60,000
16
40,000
2
12,000
4
8,000
8
6,000
16
4,000
2
1,200
4
800
8
600
16
400
Default Path
Cost Value
2
60
4
40
8
30
16
20
2
12
4
9
8
7
April 2006
Configuring Spanning Tree Port Parameters
page 5-25
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