Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 347)

Configuring OSPFv3 Graceful Restart Helper mode
To enable the graceful restart (GR) helper capability, use the graceful-restart helper command in the
OSPFv6 interface mode. Graceful restart for OSPFv3 helper mode is enabled by default.
device(config-ospf6-router)# graceful-restart helper strict-lsa-checking
Syntax: [no] graceful-restart helper {disable | strict-lsa-checking}
The disable keyword is used to disable the graceful-restart helper capability. By default, it is enabled.
The strict-lsa-checking keyword is used to enable the graceful-restart helper device to terminate
restart supporting any topology change. By default, it is disabled.
OSPFv3 area information fields TABLE 70
Task Configuration example
Disabling graceful-restart-helper on a device
device(config-ospf6-router)#graceful-
restart helper disable
NOTE
Graceful restart for OSPFv3 helper mode is enabled by
default.
Enabling graceful-restart-helper on a device
device(config-ospf6-router)#no graceful-
restart helper disable
Enabling LSA checking option on the helper
device(config-ospf6-router)#graceful-
restart helper strict-lsa-checking
Enabling graceful-restart-helper per VRF
NOTE
Graceful-restart-helper option can be enabled or disabled
per VRF in OSPFv3. If configured outside VRF, then it is
applicable to the default VRF instance of OSPFv3.
device(config-ospf6-router-vrf-
red)#graceful-restart helper strict-lsa-
checking
Configuring OSPFv3 Non-stop routing (NSR)
In graceful restart, the restarting neighbors need to help build the routing information during the failover,
but the graceful restart helper may not be supported by all devices in a network. Hence to eliminate this
dependency, the non-stop routing (NSR) feature is supported on Brocade devices. NSR does not
require support from neighboring devices to perform hitless failover. NSR does not support IPv6-over-
IPv4 tunnel and vitual link, so traffic loss is expected while performing hitless failover.
To enable NSR for OSPFv3, use the nonstop-routing command in the OSPFv6 interface mode.
device(config)# ipv6 router ospf
device(config-ospf6-router)# nonstop-routing
To disable NSR for OSPFv3, use the no form of the nonstop-routing command.
Syntax: [no] nonstop-routing
Configuring OSPFv3 Graceful Restart Helper mode
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 347
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