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CHAPTER 3
Configuring Gigabit Ethernet Interfaces to
Match Your Topology
Configuring a Gigabit Ethernet Interface
Copyright © 2010, Juniper Networks, Inc.
This chapter includes the following topics:
Configuring a Gigabit Ethernet Interface on page 21
Swapping Small Form-Factor Pluggable (SFP) Devices on page 22
The LN1000 has eight Gigabit Ethernet interfaces that can terminate into a copper or
fiber Ethernet PHY device SFP (small form-factor pluggable). Depending on the type of
device into which you are terminating these Gigabit Ethernet interfaces, you can configure
them to operate in SGMII or 1000Base-X mode. When configured in SGMII mode, you
can run ports speeds of 10/100/1000 Mbs in full or half duplex modes. When configured
in 1000Base-X mode, you can run these ports in 1000 Mbs mode. Use the
statement in Chapter 8 to configure these options.
The LN1000-V rear transition module (RTM) supports both copper and fiber SFPs.
If you are running an LN1000 with the LN1000-V RTM and are using copper SFPs,
configure the mac-mode to SGMII.
If you are running an LN1000 with the LN1000-V RTM and are using fiber SFPs, configure
the mac-mode to 1000Base-X.
Junos OS uses the following defaults:
mac-mode set to 1000Base-X
auto-negotiation set to ON
To add or change mac-mode fields:
set interfaces ge-0/0/1 gigether-options mac-mode sgmii|1000base-x
If you want to delete mac-mode, use the following command:
delete interfaces ge-0/0/1 gigether-options mac-mode
mac-mode
21
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