Juniper EX3400 Features Manual
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Brand: Juniper
Category: Network Router , Switch
Type: Features manual
Model: Juniper EX2300 , Juniper EX4300 , Juniper EX3400
Pages: 476
[edit system services dhcp-local-server overrides]
user@host# set interface-client-limit number
NOTE: For DHCP local server and DHCP relay agent, you can use either the
interface-client-limit statement or the client-discover-matchincoming-interface
statement to set a limit of one client per interface. The interface-client-limit
statement with a value of 1 retains the existing client and rejects any new
client connections. The client-discover-match incoming-interface statement
deletes the existing client and allows a new client to connect.
Related
Documentation
Overriding Default DHCP Local Server Configuration Settings on page 28•
• Allowing Only One DHCP Client Per Interface
• Deleting DHCP Local Server and DHCP Relay Override Settings on page 30
• Extended DHCP Local Server Overview on page 22
• Extended DHCP Relay Agent Overview on page 46
DHCP Local Server Handling of Client Information Request Messages
DHCP clients that already have externally provided addresses may solicit further
configuration information from a DHCP server by sending a DHCP information request
that indicates what information is desired. By default, DHCP local server and DHCPv6
local server ignore any DHCP information requests that they receive. You can override
this default behavior to enable processing of these messages.
If you enable processing of information requests, DHCP local server responds to the client
with a DHCP acknowledgment message that includes the requested information—if it
is available. DHCPv6 local server responds in the same manner but uses a DHCP reply
message. No subscriber management or DHCP-management is applied as a result of
the DHCP information request message.
By default, DHCP relay and DHCP relay proxy automatically forward DHCP information
request messages without modification if the messages are received on an interface
configured for a DHCP server group. DHCP relay and relay proxy drop information request
messages received on any other interfaces. You cannot disable this default DHCP relay
and relay proxy behavior.
The information requested by these clients has typically been configured with the
dhcp-attributes statement for an address pool defined by the address-assignment pool
pool-name statement at the [edit access] hierarchy level.
When you enable processing of DHCP information requests, you can optionally specify
the name of the pool from which the local server retrieves the requested configuration
information for the client. If you do not do specify a local pool, then the local server
requests that AAA selects and returns only the name of the relevant pool.
107Copyright © 2017, Juniper Networks, Inc.
Chapter 8: Managing DHCP Clients