NOTE: When you do not enable transition mode, you do not have IPv6 connectivity between routers
operating in single-topology mode and routers operating in multi-topology mode.
2 Exclude this router from other router’s SPF calculations.
ROUTER ISIS AF IPV6 mode
set-overload-bit
3 Set the minimum interval between SPF calculations.
ROUTER ISIS AF IPV6 mode
spf-interval [level-l | level-2 | interval] [initial_wait_interval
[second_wait_interval]]
Use this command for IPv6 route computation only when you enable multi-topology. If using single-
topology mode, to apply to both IPv4 and IPv6 route computations, use the spf-interval command
in CONFIG ROUTER ISIS mode.
4 Implement a wide metric-style globally.
ROUTER ISIS AF IPV6 mode
isis ipv6 metric metric-value [level-1 | level-2 | level-1-2]
To configure wide or wide transition metric style, the cost can be between 0 and 16,777,215.
Configuring IS-IS Graceful Restart
To enable IS-IS graceful restart globally, use the following commands. Additionally, you can implement
optional commands to enable the graceful restart settings.
• Enable graceful restart on ISIS processes.
ROUTER-ISIS mode
graceful-restart ietf
• Configure the time during which the graceful restart attempt is prevented.
ROUTER-ISIS mode
graceful-restart interval minutes
The range is from 1 to 120 minutes.
The default is 5 minutes.
• Enable the graceful restart maximum wait time before a restarting peer comes up.
ROUTER-ISIS mode
graceful-restart restart-wait seconds
When implementing this command, be sure to set the t3 timer to adjacency on the restarting router.
The range is from 1 to 120 minutes.
The default is 30 seconds.
• Configure the time that the graceful restart timer T1 defines for a restarting router to use for each
interface, as an interval before regenerating Restart Request (an IIH with RR bit set in Restart TLV) after
waiting for an acknowledgement.
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