To configure ADF support, use the following stanza at the [edit dynamic-profiles
profile-name interfaces interface-name unit logical-unit-number family family] hierarchy
level:
filter {
adf {
counter;
input-precedence precedence;
output-precedence precedence;
rule rule-value;
}
}
[Subscriber Access, System Basics and Services Command Reference]
•
Per-interface DHCP tracing operations (MX Series routers)—In addition to the existing
global DHCP tracing operation, you can now trace DHCP operations for a specific
interface or a range of interfaces.
Configuring interface-based tracing is a two-step procedure. First configure the tracing
options that you want to use, such as the file used for the trace operation and the trace
flags. In the second step, enable the tracing operation on the specific interface or range
of interfaces.
•
To configure the per-interface tracing options, use the interface-traceoptions
statement at the [edit system services dhcp-local-server] hierarchy level for the DHCP
local server or at the [edit forwarding-options dhcp-relay] hierarchy level for the DHCP
relay agent.
•
To enable tracing on an interface or interface range, use the trace statement at the
[edit system services dhcp-local-server group group-name interface interface-name]
hierarchy level for the DHCP local server, or the [edit forwarding-options dhcp-relay
group group-name interface interface-name] hierarchy level for the DHCP relay agent.
You can also enable tracing for DHCPv6 at the [edit system services dhcp-local-server
dhcpv6 group group-name interface interface-name] hierarchy level.
[Subscriber Access]
•
Automatic binding of stray DHCP requests (MX Series routers)—The default behavior
has changed for handling DHCP requests that are received but which have no entry in
the database (stray requests). Beginning with Junos OS Release 10.4, automatic binding
of stray requests is enabled by default. In Junos OS Release 10.3 and earlier releases,
automatic binding of stray requests is disabled by default.
By default, DHCP relay and DHCP relay proxy now attempt to bind the requesting client
by creating a database entry and forwarding the request to the DHCP server. If the
server responds with an ACK, the client is bound and the ACK is forwarded to the client.
If the server responds with a NAK, the database entry is deleted and the NAK is
forwarded to the client. This behavior occurs regardless of whether authentication is
configured.
In Junos OS Release 10.3 and earlier releases, DHCP relay drops stray requests and
forwards a NAK to the client when authentication is configured. Otherwise, DHCP relay
attempts to bind the requesting client. In those releases, DHCP relay proxy always
29Copyright © 2010, Juniper Networks, Inc.
New Features in Junos OS Release 10.4 for M Series, MX Series, and T Series Routers
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