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JunosE 11.3.x Physical Layer Configuration Guide
Configuring the Physical Interface
debounce
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Configuring the physical interface—You must perform basic configuration steps for all
interfaces. This task begins with selecting an Ethernet interface and setting parameters
such as line speed and MTU.
Configuring VLANs and stacked VLANs (S-VLANs)—After you configure the physical
interface, you must decide whether to configure the Ethernet interface with or without
VLANs or S-VLANs. VLANs and S-VLANs enable you to multiplex multiple IP interfaces
and PPPoE interfaces over a single physical Ethernet port. If you are not configuring
with VLANs or S-VLANs, proceed to "Configuring Ethernet Interfaces" on page 167.
Configuring upper-layer protocols—You must determine which upper-layer protocols,
such as MPLS, to configure on the interface. This section focuses on non-VLAN
configurations. You can configure some upper-layer protocols, such as PPPoE, with
or without VLANs. For more information, see JunosE Link Layer Configuration Guide .
This section describes how to complete the basic configuration for a Fast Ethernet,
Gigabit Ethernet, or 10-Gigabit Ethernet interface. CLI examples are provided with the
individual command descriptions.
To configure an Ethernet interface:
Select an Ethernet interface.
1.
(Optional) Specify the line speed and duplex mode.
2.
(Optional) Specify the MTU.
3.
(Optional) Set the time interval at which the router records bit and packet rates.
4.
(Optional) Associate a name with the interface.
5.
(Optional) Validate MAC addresses on a per interface basis.
6.
(Optional) Enable the debounce timer and set the time interval that the interface
7.
waits before reporting a state change to the upper-layer protocols.
(Optional) Modify the interval that the interface waits before reporting a state change
8.
to the upper-layer protocols.
Use to enable the debounce configuration and set the interval, in seconds, for which
an interface must maintain a given state—for example, up or down—before the interface
reports the state change to the upper-layer protocols.
NOTE: Debounce configuration is supported for all Ethernet module
combinations on E Series routers.
When a link briefly goes up or down, the momentary loss of signal can cause a temporary
service interrution for connection-oriented protocols such as PPPoE. Configuring the
Copyright © 2010, Juniper Networks, Inc.
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