Monitoring M160 Router Components ! 29
Chapter 7: M160 Internet Router Overview
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.
Monitoring M160 Router Components
See the following chapters for information about monitoring and troubleshooting
the M160 router components:
! “Monitoring the Router Chassis” on page 107
! “Monitoring the Routing Engine” on page 125
! “Monitoring Redundant Routing Engines” on page 491
! “Monitoring FPCs” on page 163
! “Monitoring PICs” on page 183
! “Monitoring the Craft Interface” on page 197
! “Monitoring Power Supplies” on page 217
! “Monitoring Redundant Power Supplies” on page 507
! “Monitoring the Cooling System” on page 251
! “Monitoring Redundant Cooling System Components” on page 523
! “Maintaining the Cable Management System, Cables, and Connectors” on
page 275
! “Monitoring the Host Module” on page 341
! “Monitoring the SFMs” on page 347
Routing Engine 1–2 Manages routing protocols and maintains
routing tables
Yes Hot-pluggable –
SFM 1–4 Provides packet switching, packet
forwarding, and route lookup
Yes Hot-removable,
hot-insertable
Yes
Component Quantity Function Redundant
Field-
replaceable
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