Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 446)

418 Multi-Service IronWare Routing Configuration Guide
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IPv6 Non stop routing and graceful restart
Supported protocols
The following protocols support both failover and Hitless Operating system Switchover (HLOS) for
each protocol.
Restart global timers
Restart contains two global timers, max-hold-timer and the protocols-converge-timer, that:
• Limit the amount of time used for re-syncing routes between the backup Management module
and Interface modules (LPs) within the same chassis
• Allow a buffer time for protocols to converge and solve dependencies among each other
If the protocol-based restart features are configured when a Management module (MP) performs a
switchover to its backup, routes are maintained on the LPs through the protocol-based restart
processes for a specified period of time while the new MP learns the network routes. Once the MP
learns all of its routes, the routes from the MP are synced with the routes on the LPs.
Graceful-restart IPv6 max-hold-timer
The graceful-restart ipv6 max-hold-timer command defines the time that a Brocade device waits
before sync up forwarding information is sent to the LP.
Use the graceful-restart ipv6 max-hold-timer command to set the max-hold-timer value.
Brocade(config)# graceful-restart ipv6 max-hold-timer 300
Syntax: [no] graceful-restart ipv6 max-hold-timer hold-interval
The hold-time variable is the maximum hold time in seconds before sync up forwarding information
is sent to the LP. The acceptable range is 30 to 3600 seconds. The default is 300 seconds.
Graceful-restart IPv6 protocols-converge-timer
The graceful-restart ipv6 protocols-converge-timer command defines the time that a Brocade
device waits for restarting protocols to converge at the final step in the restart process. In a heavily
loaded system where BGP/OSPF/GRE/Static protocols can have a dependency on each other, their
restart procedures may also depend on each other. This timer allows protocols to solve
inter-dependencies after individual restart processes and before routing modules sync up new
forwarding information to the interface module. The default value of 5 seconds will work in most
cases, but if a system is heavily loaded and has protocols that depend on each other, it is
recommended to increase this value.
Use the graceful-restart ipv6 protocols-converge-timer command to set the timer value.
Brocade(config)# graceful-restart ipv6 protocols-converge-timer 20
TABLE 71 IPv6 Supported protocols for non-stop routing and graceful restart
Protocol Mechanism
OSPFv3 Non-stop routing, Graceful restart helper
IS-IS IPv6 Non-stop routing
BGP IPv6 Graceful restart