Supported Platforms
Related Documentation
link-mode
Syntax
Hierarchy Level
Release Information
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Statement introduced in Junos OS Release 12.2 for ACX Series Universal Access Routers.
Description
Set the device’s link connection characteristic.
Options
mode—Link characteristics:
- automatic—Link mode is auto-negotiated. This is the default for EX Series switches. The link operates at the highest possible speed, depending on the capabilities of the remote end.
- full-duplex—Connection is full duplex.
- half-duplex—Connection is half duplex.
Default: Fast Ethernet interfaces, except the J Series ePIM Fast Ethernet interfaces, can operate in either full-duplex or half-duplex mode. The router’s management Ethernet interface, fxp0 or em0, the built-in Fast Ethernet interfaces on the FIC (M7i router), and the Gigabit Ethernet ports on J Series Services Routers with uPIMs installed and configured for access switching mode autonegotiate whether to operate in full-duplex or half-duplex mode. Unless otherwise noted here, all other interfaces operate only in full-duplex mode.
 | Note: On J Series ePIM Fast Ethernet interfaces, 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:
|
| Note: Member links of an aggregated Ethernet bundle must not be explicitly configured with a link mode. You must remove any such link-mode configuration before committing the aggregated Ethernet configuration. |
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
