H3C S9500E Series Configuration Manual page 40

Manually recovering an IRF fabric
An IRF link failure causes an IRF fabric to divide into two IRF fabrics and thus multi-active collision occurs.
When the system detects the collision, it holds a role election between the two collided IRF fabrics. The
IRF fabric whose master's member ID is smaller prevails and operates normally. The state of the other IRF
fabric transits to recovery state and temporarily cannot forward data packets. In this case, recover the IRF
fabric by repairing the IRF link first (the switch tries to automatically repair the failed IRF links. If the
reparation fails, manually repair the failed links.) . When the link is recovered, the IRF fabric in active
state and the IRF fabric in recovery state automatically merge into one. The IRF fabrics can merge into
one only when you reboot the specified IRF fabric. If you reboot the IRF fabric in recovery state, two IRF
fabrics merge into one. Service ports that were shut down and belonged to the IRF fabric in recovery state
automatically restore their original physical state, and the whole IRF fabric recovers, as shown in
13. If you reboot the IRF fabric in active state, two IRF fabrics merge into one. To enable the whole IRF
fabric to recover in this case, execute the mad restore command to manually restore the original physical
state of the service ports that were shut down and belonged to the IRF fabric in recovery state, as shown
in Figure 14.
Figure 13 Recover the IRF fabric when IRF link failure occurs
IRF 1
(Active)
If the IRF fabric in active state fails due to exceptions (a member fails or link failure occurs, for
•
example) before the IRF link is recovered, as shown in
state) at the CLI by executing the mad restore command. Then, the state of IRF fabric 2 changes
from recovery to active without the need of rebooting and takes over IRF fabric 1. Repair the IRF links.
Then, the two IRF fabrics merge when the IRF link failure is recovered, and the IRF fabric recovers.
IP network
IRF 2
(Recovery)
IP network
After the IRF link is
recovered
Figure
32
IP network
IRF
IP network
14, enable IRF fabric 2 (in recovery
Figure