3com MSR 20-20 참조 매뉴얼

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The IPv6 address prefix list is used to filter IPv6 addresses. It may have multiple 
items, and each of them specifies a range of IPv6 prefix. The filtering relation 
among items is logic OR, namely, a route passing an item will pass the prefix list.

The IPv6 prefix range is determined by prefix-length and [ min-prefix-length, 
max-prefix-length ]. If both mask-length and [ min-mask-length, 
max-mask-length ] are specified, then the IPv6 addresses must satisfy both of 
them.

If ipv6-address prefix-length is specified as :: 0, then only the default route 
matches.

If you want to it match all the routes, configure it as :: 0 less-equal 128.

# Permit the IPv6 addresses with mask length between 32 bits and 64 bits.

<Sysname> system-view

[Sysname] ip ipv6-prefix abc permit :: 0 greater-equal 32 less-equal 64 

# Deny the IPv6 addresses with prefix as 3FFE:D00::/32, prefix length greater than 
or equal to 32 bits.

<Sysname> system-view

[Sysname] ip ipv6-prefix abc deny 3FEE:D00:: 32 less-equal 128 

reset ip ipv6-prefix [ ipv6-prefix-name ]

User view

ipv6-prefix-name: IPv6 prefix list name, a string of 1 to 19 characters.

Use the reset ip ipv6-prefix command to clear the statistics of the specified IPv6 
prefix list. If no name is specified, the statistics of all IPv6 prefix lists will be cleared.

# Clear the statistics of IPv6 prefix list abc.

<Sysname> reset ip ipv6-prefix abc