The LAG degrade priority event is assigned to an existing Link Aggregation Group (LAG). The LAG degrade priority event is conditional on a 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 determine the new in-use priority on the virtual router instance.
The following example shows a LAG degrade priority event and it’s 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 Table: LAG Events:
User-defined thresholds: 2 ports down, 4 ports down, 6 ports down
LAG configured ports: 8 ports
Hold-set timer (hold-set): 5 seconds
| Time (seconds) | LAG Port State | Parameter | State | Comments |
|---|---|---|---|---|
0 |
All ports down |
Event State |
Set - 8 ports down |
— |
Event Threshold |
6 ports down |
— |
||
Hold-set Timer |
5 seconds |
Set to hold-set parameter |
||
1 |
One port up |
Event State |
Set - 8 ports down |
Cannot change until hold-set timer expires |
Event Threshold |
6 ports down |
— |
||
Hold-set Timer |
5 seconds |
Event does not affect timer |
||
2 |
All ports up |
Event State |
Set - 8 ports down |
Still waiting for hold-set timer expiry |
Event Threshold |
6 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 |
Five ports down |
Event State |
Set - 5 ports down |
— |
Event Threshold |
4 ports down |
— |
||
Hold-set Timer |
Expired |
Set to hold-set parameter |
||
102 |
Three ports down |
Event State |
Set - 5 ports down |
— |
Event Threshold |
4 ports down |
— |
||
Hold-set Timer |
3 seconds |
— |
||
103 |
All ports up |
Event State |
Set - 5 ports down |
— |
Event Threshold |
4 ports down |
— |
||
Hold-set Timer |
2 second |
— |
||
104 |
Two ports down |
Event State |
Set - 5 ports down |
— |
Event Threshold |
4 ports down |
— |
||
Hold-set timer |
1 second |
Current threshold is 5, so 2 down has no effect |
||
105 |
Two ports down |
Event State |
Set - 2 ports down |
— |
Event Threshold |
2 ports down |
— |
||
Hold-set timer |
Expired |
— |
||
200 |
Four ports down |
Event State |
Set - 2 ports down |
— |
Event Threshold |
4 ports down |
— |
||
Hold-set timer |
5 seconds |
Set to hold-set parameter |
||
202 |
Seven ports down |
Event State |
Set - 7 ports down |
Changed because of increase |
Event Threshold |
6 ports down |
— |
||
Hold-set timer |
5 seconds |
Set to hold-set because of threshold increase |
||
206 |
All ports up |
Event State |
Set - 7 ports down |
— |
Event Threshold |
6 ports down |
— |
||
Hold-set timer |
1 second |
— |
||
207 |
All ports up |
Event State |
Cleared - All ports up |
— |
Event Threshold |
None |
Event cleared |
||
Hold-set timer |
Expired |
— |