Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

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The DHCP attributes do not apply to shared local address pools; for example,
the lease time for shared local address pools is infinite.
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When you delete the referenced DHCP address pool, DHCP notifies the local
address server and logs out all subscribers that are using addresses from the
deleted pool.
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When you delete a shared local address pool, the local address server logs out
the subscribers that are using addresses from the deleted pool, then notifies
DHCP and releases the addresses.
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If the chain of linked DHCP address pools is broken, no action is taken and the
existing subscribers retain their address. However, the DHCP local address pools
that are no longer part of the chain are now unable to provide any new addresses.
Example
This following commands create the shared address pools in Figure 2 on page 55:
host1(config)# ip local shared-pool Shared_LAS_Pool_A DHCP_Pool_1
host1(config)# ip local shared-pool Shared_LAS_Pool_B DHCP_Pool_1
host1(config)# ip local shared-pool Shared_LAS_Pool_C DHCP_Pool_3
SNMP Thresholds
An address pool has SNMP thresholds associated with it that enable the local address
server to signal SNMP traps when certain conditions exist. These thresholds include
high utilization threshold and abated utilization threshold. If a pool’s outstanding
addresses exceed the high utilization threshold and the SNMP trap signaling is enabled,
SNMP is notified. Likewise, when a pool’s utilization drops below the abated threshold
utilization threshold, SNMP is notified.
Configuring a Local Address Server
You can create, modify, and delete address pools. You can display address pool
information or status with the
show ip local pool command. The following are
examples of tasks you can configure:
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Specify an addressing scheme.
host1(config)# ip address-pool local
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Map an address pool name to a range of local addresses. You can also use this
command to add additional ranges to a pool.
host1(config)# ip local pool addrpool_10 192.168.56.10 192.168.56.15
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Map a primary local address pool name to a domain name.
host1(config)# aaa domain-map westford.com
host1(config-domain-map)# address-pool-name poolA
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(Optional) Map a backup address pool to a domain name, which is used for
address allocation if the primary local address pool is fully allocated.
host1(config)# aaa domain-map westford.com
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Configuring Local Address Servers
JUNOSe 11.0.x Broadband Access Configuration Guide