Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks
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Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

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By default, the router’s management <strong>Ethernet</strong> interface, fxp0 or em0, autonegotiates<br />

whether to operate in full-duplex or half-duplex mode. J Series Gigabit <strong>Ethernet</strong> interfaces<br />

and Fast <strong>Ethernet</strong> interfaces, except the J Series ePIM Fast <strong>Ethernet</strong> interfaces, can<br />

operate in either full-duplex or half-duplex mode, and all other interfaces can operate<br />

only in full-duplex mode. For Gigabit <strong>Ethernet</strong> and 10-Gigabit <strong>Ethernet</strong>, the link partner<br />

must also be set to full duplex.<br />

NOTE: For M Series, MX Series, and most T Series routers, the management<br />

<strong>Ethernet</strong> interface is fxp0. For TX Matrix Plus routers and T1600 routers<br />

configured in a routing matrix, the management <strong>Ethernet</strong> interface is em0.<br />

NOTE: Automated scripts that you have developed for standalone T1600<br />

routers (T1600 routers that are not in a routing matrix) might contain<br />

references to the fxp0 management <strong>Ethernet</strong> interface. Before reusing the<br />

scripts on T1600 routers in a routing matrix, edit the command lines that<br />

reference the fxp0 management <strong>Ethernet</strong> interface so that the commands<br />

reference the em0 management <strong>Ethernet</strong> interface instead.<br />

NOTE: When you configure the Tri-Rate <strong>Ethernet</strong> copper interface to operate<br />

at 1 Gbps, autonegotiation must be enabled.<br />

NOTE: On a J Series ePIM Fast <strong>Ethernet</strong> interface, if you specify half-duplex<br />

(or if full-duplex mode is not autonegotiated), the following message is<br />

written to the system log: "Half-duplex mode not supported on this PIC,<br />

forcing full-duplex mode."<br />

NOTE: When you manually configure Fast <strong>Ethernet</strong> interfaces on the M Series<br />

and T Series routers, link mode and speed must both be configured. If both<br />

these values are not configured, the router uses autonegotiation for the link<br />

and ignores the user-configured settings.<br />

NOTE: Member links of an aggregated <strong>Ethernet</strong> bundle must not be explicitly<br />

configured with a link mode. You must remove any such link-mode<br />

configuration before committing the aggregated <strong>Ethernet</strong> configuration.<br />

To explicitly configure an <strong>Ethernet</strong> interface to operate in either full-duplex or half-duplex<br />

mode, include the link-mode statement at the [edit interfaces interface-name] hierarchy<br />

level:<br />

Copyright © 2012, <strong>Juniper</strong> <strong>Networks</strong>, Inc.<br />

[edit interfaces interface-name]<br />

Chapter 2: Configuring <strong>Ethernet</strong> <strong>Interfaces</strong><br />

47

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