Reference Guide

506 | Intermediate System to Intermediate System
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Configure Multi-Topology IS-IS (MT IS-IS)
Configure Multi-Topology IS-IS (MT IS-IS)
Step Task Command Syntax Command Mode
1 Enable Multi-Topology IS-IS for IPv6.
Enter the transition keyword 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 users can remove
the transition keyword on each router.
multi-topology [transition] ROUTER ISIS AF IPV6
Note: When transition mode is not enabled, you will not have IPv6 connectivity between routers
operating in single-topology mode and routers operating in multi-topology mode.
2 Excluded this router from other router’s SPF
calculations.
set-overload-bit
ROUTER ISIS AF IPV6
3 Set the minimum interval between SPF
calculations.
spf-interval [level-l | level-2 |
interval] [initial_wait_interval
[second_wait_interval]]
ROUTER ISIS AF IPV6
This command is used for IPv6 route computation only when multi-topology is enabled. If using single-topology
mode, use the spf-interval command in CONFIG ROUTER ISIS mode to apply to both IPv4 and IPv6 route
computations.
4
Implement a wide metric-style globally.
To configure wide or wide transition metric
style, the cost can be a between 0 and
16,777,215.
isis ipv6 metric metric-value
[level-1 | level-2 | level-1-2]
ROUTER ISIS AF IPV6
Step Task Command Syntax Command Mode
1 Enable Multi-Topology IS-IS for IPv6.
Enter the transition keyword 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 users can remove
the transition keyword on each router.
multi-topology [transition] ROUTER ISIS AF IPV6
Note: When transition mode is not enabled, you will not have IPv6 connectivity between routers
operating in single-topology mode and routers operating in multi-topology mode.
2 Excluded this router from other router’s SPF
calculations.
set-overload-bit
ROUTER ISIS AF IPV6