Configuring Gratuitous Arp - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

JUNOS 10.1 Network Interfaces Configuration Guide
interfaces can operate only in full-duplex mode. For Gigabit Ethernet and 10-Gigabit
Ethernet, the link partner must also be set to full duplex.
NOTE: For M Series, MX Series, and most T Series routers, the management Ethernet
interface is
matrix, the management Ethernet interface is
NOTE: Automated scripts that you have developed for standalone T1600 routers
(T1600 routers that are not in a routing matrix) might contain references to the
management Ethernet interface. Before reusing the scripts on T1600 routers in a
routing matrix, edit the command lines that reference the
interface so that the commands reference the
instead.
NOTE: When you configure the Tri-Rate Ethernet copper interface to operate at
1 Gbps, autonegotiation must be enabled.
NOTE: On a J Series ePIM Fast Ethernet interface, if you specify half-duplex (or if
full-duplex mode is not autonegotiated), the following message is written to the
system log: "Half-duplex mode not supported on this PIC, forcing full-duplex mode."
NOTE: When you manually configure Fast Ethernet interfaces on the M Series and
T Series routers, link mode and speed must both be configured. If both these values
are not configured, the router uses autonegotiation for the link and ignores the
user-configured settings.
To explicitly configure an Ethernet interface to operate in either full-duplex or
half-duplex mode, include the
hierarchy level:

Configuring Gratuitous ARP

Gratuitous Address Resolution Protocol (ARP) requests provide duplicate IP address
detection. A gratuitous ARP request is a broadcast request for a router s own IP
address. If a router sends an ARP request for its own IP address and no ARP replies
are received, the router s assigned IP address is not being used by other nodes. If a
router sends an ARP request for its own IP address and an ARP reply is received, the
router s assigned IP address is already being used by another node.
614
Configuring Gratuitous ARP
. For TX Matrix Plus routers and T1600 routers configured in a routing
fxp0
[edit interfaces interface-name]
link-mode (full-duplex | half-duplex);
em0 .
management Ethernet interface
em0
statement at the
link-mode
fxp0
management Ethernet
fxp0
[edit interfaces interface-name]