R3303-HP HSR6800 Routers Layer 3 - IP Routing Command Reference

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Usage guidelines
Before you configure this command, enable IPv6 for the IS-IS process, and set the cost style to wide,
wide-compatible, or compatible for the system.
Examples
# Enable IPv6 IS-IS MTR.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] multiple-topology ipv6-unicast