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Example: Limiting the Number of Prefixes Used by DHCPv6 Clients
If you a configure a very large prefix range in an IPv6 local address pool, the number of prefixes that can be used from that range by DHCPv6 clients is limited to 1048576.
Consider the following example in which an IPv6 local address pool, largePrefixRange, is configured. The prefix range is specified by the starting prefix and its length as 3003:3003::/32.
host1(config)#ipv6 local pool largePrefixRange host1(config-v6-local)#prefix 3003:3003::/32
64 host1(config-v6-local)#end
The Total field of the output of the following show ipv6 local pool largePrefixRange and show ipv6 local pool commands indicates the number of prefixes that can be allocated to DHCPv6 clients: 1048756.
host1#show ipv6 local pool largePrefixRange
Pool : largePrefixRange
-----------------------
Utilization : 0
Start End Total In Use
------------------------- ------------------------- ------- -------
3003:3003::/64 3003:3003:ffff:ffff::/64 1048576 0
Preferred Valid
Start Exclude Util Lifetime Lifetime
------------------------- ------- ---- ---------- ----------
3003:3003::/64 0 0 1 day 1 day
host1#show ipv6 local pool
IPv6 Local Address Pools
------------------------
Pool Start End
---------------- ------------------------- -------------------------
largePrefixRange 3003:3003::/64 3003:3003:ffff:ffff::/64
Pool Total In Use
---------------- ------- -------
largePrefixRange 1048576 0 Published: 2012-06-27
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