Port Features
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7750 SR OS Interface Configuration Guide
LAG port threshold value. If the number of available links falls below the configured
threshold, the configured threshold action determines if and at what cost this LAG
will be advertised.
For example, assume a single link in OSPF has an associated cost of 100 and the LAG
consists of four physical links. The cost associated with the logical link is 25. If one
link fails then the cost would automatically be adjusted to 33.
If dynamic cost is not configured then costing is applied based on the total number of
links configured. The cost would be calculated at 25. This will remain static provided
the number of links that are up exceeds the configured LAG threshold.
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LAG port threshold
The LAG port threshold feature allows configuration of the behavior, once the
number of available links in a LAG falls below or is equal to the specified threshold.
Two options are available:
1. If the number of links available (up) in a LAG is less than the configured threshold, then
the LAG is regarded as operationally down.
For example, assume a LAG consists of eight physical links. The threshold is set to four
and dynamic costing is not configured. If the operational links is equal to or drops below
four, the link is regarded as operationally down until the number of operational links is
four or more.
2. When the number of links available in a LAG is less than the configured threshold, the
LAG starts using the dynamic-cost allowing other nodes to adjust their routing tables
according to the revised costs. In this case, when the threshold is not crossed, a fixed
metric (all links operational) is advertised.
Summary of Contents for 7750 SR OS
Page 6: ...Page 6 7750 SR OS Interface Configuration Guide Table of Contents ...
Page 8: ...Page 8 7750 SR OS Interface Configuration Guide List of Tables ...
Page 10: ...Page 10 7750 SR OS Interface Configuration Guide List of Figures ...
Page 14: ...Preface Page 14 7750 SR OS Interface Configuration Guide ...
Page 16: ...Getting Started Page 16 7750 SR OS Interface Configuration Guide ...
Page 184: ...Card MDA and Port Command Reference Page 184 7750 SR OS Interface Configuration Guide ...
Page 438: ...Debug Commands Page 438 7750 SR OS Interface Configuration Guide ...
Page 444: ...Index Page 444 7750 SR OS Interface Configuration ...