H3C MSR 5600, Руководство по настройке

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8
Collision handling
When MAD detects a multi-active collision, it sets all IRF fabrics except one to the Recovery state.
The fabric that is not placed in Recovery state can continue to forward traffic. The Recovery-state
IRF fabrics are inactive and cannot forward traffic.
LACP MAD and BFD MAD use the following process to handle a multi-active collision:
1. Compare the number of members in each fabric.
2. Set all fabrics to the Recovery state except the one that has the most members.
3. Compare the member IDs of the masters if all IRF fabrics have the same number of members.
4. Set all fabrics to the Recovery state except the one that has the lowest numbered master.
5. Shut down all common network interfaces in the Recovery-state fabrics except for the following
interfaces:

Interfaces automatically excluded from being shut down by the system.

Interfaces specified by using the
mad exclude interface
command.
Failure recovery
To merge two split IRF fabrics, first repair the failed IRF link and remove the IRF link failure.
After the failed IRF link between two split IRF fabrics is recovered, log in to the inactive IRF fabric to
reboot its member devices if the system requires you to do so. After these member devices join the
active IRF fabric as subordinate devices, the IRF merge is complete, as shown in
Figure 7 . The
network interfaces that have been shut down by MAD automatically restore their original state.
CAUTION:
If you inadvertently reboot the active IRF fabric after the failed IRF link recovers, its member devices
will join the inactive IRF fabric with their network interfaces being shut down by MAD. To restore the
original states of the network interfaces in the merged IRF fabric, use the
mad restore
command.
NOTE:
If the IRF auto-merge feature is enabled, the inactive IRF member devices will automatically reboot
after the failed IRF link recovers and a manual reboot is typically not required.
Figure 7 Recovering the IRF fabric
If the active IRF fabric fails before the IRF link is recovered (see Figure 8 ), use the mad restore
command on the inactive IRF fabric to recover the inactive IRF fabric. This command brings up all
network interfaces that were shut down by MAD. After the IRF link is repaired, merge the two parts
into a unified IRF fabric.
IRF
fabric
IP network
IP network
IRF fabric 1
(Active)
IRF fabric 2
(Recovery)
IP network
IP network
IRF fabric 1
(Active)
IRF fabric 2
(Recovery)
IP network
IP network
After the IRF
link is
recovered
IRF merge