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Configuring Multi-Topology IS-IS (MT IS-IS)
To configure multi-topology IS-IS (MT IS-IS), use the following commands.
1
Enable multi-topology IS-IS for IPv6.
ROUTER ISIS AF IPV6 mode
multi-topology [transition]
Enter the keyword transition to allow an IS-IS IPv6 user to continue to use single-topology mode
while upgrading to multi-topology mode. After every router has been configured with the transition
keyword, and all the routers are in MT IS-IS IPv6 mode, you can remove the transition keyword on
each router.
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. Also, 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
Intermediate System to Intermediate System
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Troubleshooting
