State Machine
This table provides information about the UPF states.
S.No. |
Previous State |
Internal Fault |
C-R BFD |
C-C BFD |
SRP Link State |
Next State |
Pull Down BFD |
---|---|---|---|---|---|---|---|
1 |
X |
Yes |
X |
X |
X |
Standby |
Yes |
2 |
X |
X |
Any-Down |
X |
X |
Standby |
Yes |
3 |
X |
No |
All-Up |
Any-Down |
X |
Active |
No |
4 |
X |
No |
All-Up |
All-Up |
Down |
No-Change |
No |
5 |
X |
No |
All-Up |
All-Up |
Up |
SRP-Protocol -Decided |
No |
NOTES:
-
For C-R BFDs going from "Not-All-Up" to "All-Up", a delay is introduced in SRP State processing to allow all C-C BFDs to reach steady state.
-
To avoid the dual-active scenario, ensure that the states in row 3 of the above table do not occur in both UPFs. This must not happen in a properly functioning and configured system.