The LAG degrade priority event is tied to an existing Link Aggregation Group (LAG). The LAG degrade priority event is conditional to percentage of available port bandwidth on the LAG. Multiple bandwidth percentage thresholds may be defined, each with its own priority value.
If the LAG transitions from one threshold to the next, the previous threshold priority value is subtracted from the total delta sum while the new threshold priority value is added to the sum. The new sum is then subtracted from the base priority and compared to the delta in-use priority limit to derive the new in-use priority on the virtual router instance.
The following example illustrates a LAG priority event and interaction with the hold-set timer in changing the in-use priority.
The following state and timer settings are used for the LAG events listed in the following table:
user-defined thresholds - 2 ports down 3 ports down
LAG configured ports - 4 ports
hold-set timer (hold-set) - 5 seconds
Time |
LAG port state |
Parameter |
State |
Comments |
|---|---|---|---|---|
0 |
All ports down |
Event State |
Set - 4 ports down |
|
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
5 seconds |
Set to hold-set parameter |
||
1 |
One port up |
Event State |
Set - 4 ports down |
Cannot change until Hold-Set Timer expires |
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
5 seconds |
Event does not affect timer |
||
2 |
All ports up |
Event State |
Set - 4 ports down |
Still waiting for Hold-Set Timer expires |
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
3 seconds |
|||
5 |
All ports up |
Event State |
Cleared - All ports up |
|
Event Threshold |
None |
Event cleared |
||
Hold-Set Timer |
Expired |
|||
100 |
Three ports down |
Event State |
Set - 3 ports down |
|
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
Expired |
Set to hold-set parameter |
||
102 |
Two ports down |
Event State |
Set - 3 ports down |
|
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
3 seconds |
|||
103 |
All ports up |
Event State |
Set - 3 ports down |
|
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
2 second |
|||
104 |
One ports down |
Event State |
Set - 3 ports down |
|
Event Threshold |
3 ports down |
|||
Hold-Set Timer |
1 second |
Current threshold is 2, so 1 down has no effect |
||
105 |
One ports down |
Event State |
Set - 1 port down |
|
Event Threshold |
2 ports down |
|||
Hold-Set Timer |
Expired |