Extreme Networks ExtremeWare XOS Command Reference Manual page 1429

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
configure iproute ipv6 priority
Usage Guidelines
Although these priorities can be changed, do not attempt any manipulation unless you are expertly
familiar with the possible consequences. If you change the route priority, you must save the
configuration and reboot the system.
NOTE
The priority for a blackhole route can not overlap with the priority of any other route origin.
Example
The following command sets the IPv6 route priority for static routing to 1200:
configure iproute ipv6 priority static 1200
History
This command was first available in ExtremeWare XOS 11.2.
Platform Availability
This command is available on all platforms.
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ExtremeWare XOS 11.5 Command Reference Guide