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Configuring Spanning Tree Parameters Configuring Spanning Tree Port Parameters
OmniSwitch 6600 Family Network Configuration Guide April 2006 page 5-25
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:
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:
Link Speed
Aggregate Size
(number of links)
Default Path
Cost Value
10 MB 2 1,200,000
4 800,000
8 600,000
16 400,000
100 MB 2 120,000
480,000
860,000
16 40,000
1 GB 2 12,000
48,000
86,000
16 4,000
10 GB 2 1,200
4800
8600
16 400
Link Speed
Aggregate Size
(number of links)
Default Path
Cost Value
10 Mbps 2 60
440
830
16 20
100 Mbps 2 12
49
87