Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 453)

Multi-Service IronWare Routing Configuration Guide 425
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IPv6 Non stop routing and graceful restart
IPv6 Hitless OS upgrade
OSPFv3, IS-IS IPv6, and BGP IPv6 support both failover and Hitless Operating System Switchover
(HLOS). HLOS provides a platform support mechanism to upgrade image without disrupting routing
and forwarding service.
The process of syncing routes between a new MP and its LPs using the new timers are illustrated in
Figure 32 and described in the following steps.
FIGURE 32 IPv6 HLOS operation
1. HLOS starts and the Standby MP is rebooted with a new image.
2. System switches over and the Standby MP takes role of the Active MP.
3. The old Active MP is rebooted with the new image and it takes the role of the Standby MP.
4. Once the Active and Standby MP are in sync, the LP backs up the necessary IPv6 route
information.
5. The LP CPU core resets, once the core reset is complete the LP receives IPv6 route information
from Active MP.