Specifications

slave line card crashes or all of the streams on that line card lose their timing packets,
another slave line card takes over if it has been primed to do so.
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Increased Layer 3 forwarding capabilities for MPCs and Multiservices DPCs through
FIB localization (MX Series)—Starting in Junos OS Release 13.3, forwarding information
base (FIB) localization characterizes the Packet Forwarding Engines in a router into
two types: FIB-Remote and FIB-Local. FIB-Local Packet Forwarding Engines install all
of the routes from the default route tables into Packet Forwarding Engine forwarding
hardware. FIB-Remote Packet Forwarding Engines create a default (0.0) route that
references a next hop or a unilist of next hops to indicate the FIB-Local that can perform
full IP table looks-ups for received packets. FIB-Remote Packet Forwarding Engines
forward received packets to the set of FIB-Local Packet Forwarding Engines.
The capacity of MPCs is much higher than that of Multiservices DPCs, so an MPC is
designated as the local Packet Forwarding Engine, and a Multiservices DPC is designated
as the remote Packet Forwarding Engine. The remote Packet Forwarding Engine
forwards all network-bound traffic to the local Packet Forwarding Engine. If multiple
MPCs are designated as local Packet Forwarding Engines, then the Multiservices DPC
load balances the traffic using the unilist of next hops as the default route.
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Support for centralized clocking (MX2020)—Before Junos OS Release 13.3, the
MX2020 supported SyncE (Synchronous Ethernet) in distributed mode, where the
clock module on a line card would lock to the SyncE source and distribute frequency
references to the entire chassis. Starting in Junos OS Release 13.3, the MX2020 uses
the centralized Stratum 3 clock module on the control board to lock onto SyncE and
distribute the frequency to the entire chassis. Supported features include:
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Clock monitoring, filtering, and holdover
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Hitless transition from a distributed to centralized clocking mode
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Distribution of the selected chassis clock source to downstream network elements
through supported line interfaces
You can view the centralized clock module information with the show chassis
synchronization clock-module command.
NOTE: Precision Time Protocol/IEEE 1588 continue to operate in distributed
mode.
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Enhancements to commit check processing (M Series and MX Series)—Starting in
Junos OS Release 13.3, the processing performance when you issue the commit check
command has been optimized for the following static and dynamic interface types:
•
Logical demultiplexing (demux) interfaces (demux0)
•
PPPoE logical interfaces (pp0)
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Inline services interfaces (si)
The improved performance for commit check enables the overall commit operation to
complete faster when new demux0, pp0, or si interfaces are added to the configuration.
35Copyright © 2015, Juniper Networks, Inc.
New and Changed Features