Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
16 ! M20 Router Components
The M20 router Internet Processor II ASIC forwards packets at a throughput rate of
up to 20Gigabits per second (Gbps). An optional redundant switching fabric and
Routing Engine increase system availability and ensure automatic failover in case of
component failure. The ASIC technology provides such packet processing as route
lookups, filtering, sampling, rate limiting, load balancing, buffer management,
switching, and encapsulation and de-encapsulation of IP services.
M20 Router Components
Table 6 lists the major M20 router components and characteristics.
Table 6: M20 Router Major Hardware Components
Field-replaceable units (FRUs) are router components that can be replaced at the
customer site. Replacing FRUs requires minimal router downtime. There are three
types of FRUs:
! Hot-removable and hot-insertable—You can remove and replace the
component without powering down the router or interrupting the routing
functions.
! Hot-pluggable—You can remove the component without powering down the
router, but routing functions are interrupted until the replacement is installed.
! Requires router shutdown—You must power down the router before removing
the component.
Component Quantity Function Redundant
Field-
Replaceable
Offline
Button
Cooling system 3 fan trays
and 1 rear
Routing
Engine fan
Cools router components Yes Hot-removable,
hot-insertable
–
Craft interface 1 Displays the status and allows you to
perform control functions
– Hot-removable,
hot-insertable
–
FPC 1–4 Connects PICs to other components and
houses shared memory
– Hot-removable,
hot-insertable
Yes
PIC 1–4 per
FPC
Provides interfaces to various network
media
– Hot-removable,
hot-insertable
–
Power supply 2 AC or 2
DC
Distributes needed voltages to
components
Yes Hot-removable,
hot-insertable
–
Routing Engine 1–2 Handles routing protocols and maintains
routing tables
Yes Hot-pluggable Yes
SSB 1–2 Performs router lookups, manages shared
memory, and transfers control packets
Yes Hot-pluggable –

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English