Juniper JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010 Configuration Manual page 144

JUNOSe 11.1.x Broadband Access Configuration Guide
customer edge device or requesting router is located. In such cases, the delegating
router requires only the identity of the requesting router to choose a prefix for
delegation. An IPv6 local pool is configured on the delegating router, which contains
information about the prefixes, their validity periods, and other parameters to control
their assignment to the requesting routers. The delegating router is configured with
a set of prefixes that is used to assign to a CPE or DHCPv6 client, when it first
establishes a connection with an Internet service provider (ISP).
When the delegating router receives a request from a DHCPv6 client, it selects an
available prefix and delegates it to the client. The DHCPv6 client subnets the delegated
prefix and assigns the prefixes to links at the customer edge.
Keep the following points in mind when you configure IPv6 local address pools to
assign prefixes to requesting routers:
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DHCPv6 Local Address Pools for Allocation of IPv6 Prefixes Overview
You must enable the IPv6 local address pool feature to be able to configure IPv6
local address pools.
You can configure IPv6 local address pools for DHCP to allocate prefixes to client
requests that are received over PPP or non-PPP links, such as VLAN, S-VLAN, or
Ethernet.
You can configure multiple local address pools on a single virtual router, up to
a maximum of 500 pools per virtual router.
You can also configure multiple address pools on multiple virtual routers. Each
IPv6 local address pool must have a unique name.
You can configure a valid and preferred lifetime for each IPv6 prefix, which
determines the length of time the requesting router can use the prefix.
You can configure multiple prefix ranges in an IPv6 local pool. The ranges can
have the same or different assigned prefix lengths.
You cannot configure overlapping prefix ranges in an IPv6 local pool. If you try
to configure a prefix range that overlaps with an existing prefix range in the IPv6
local pool, an error message is displayed stating that the prefix range could not
be configured. Similarly, an error message is displayed if you try to configure a
prefix range in an IPv6 local pool that overlaps with a prefix range in another
IPv6 local pool on the same virtual router.
You can configure certain prefix ranges to be excluded from being used for
delegation to the requesting router.
You can configure the IPv6 addresses of a primary and secondary DNS server
in an IPv6 local pool. The DNS server addresses are returned to the client in
DHCPv6 responses as part of the DNS Recursive Name Server option.
You can configure a list of up to four domain names in an IPv6 local pool to be
used during the resolution of hostnames to IP addresses. These domain names
are returned to clients in the DHCPv6 responses as part of the Domain Search
List option.
You can configure an IPv6 local address pool in an AAA domain map to assign
prefixes to requesting DHCPv6 clients using the ipv6 prefix-pool-name command
in Domain Map Configuration mode. If the authentication server returns the IPv6
local address pool name in the Framed-IPv6-Pool attribute of the
RADIUS-Access-Accept message, this pool overrides the IPv6 local address pool
configured in the domain map.