Cisco IOS in a Nutshell, 2nd Edition


book cover
Cisco IOS in a Nutshell, 2nd Edition
By James Boney
...............................................
Publisher: O'Reilly
Pub Date: August 2005
ISBN: 0-596-00869-4
Pages: 796
 

Table of Contents  | Index
overview

Cisco routers are everywhere that networks are. They come in all sizes, from inexpensive units for homes and small offices to equipment costing well over $100,000 and capable of routing at gigabit speeds. A fixture in today's networks, Cisco claims roughly 70% of the router market, producing high-end switches, hubs, and other network hardware. One unifying thread runs through the product line: virtually all of Cisco's products run the Internetwork Operating System, or IOS.


If you work with Cisco routers, it's likely that you deal with Cisco's IOS software--an extremely powerful and complex operating system, with an equally complex configuration language. With a cryptic command-line interface and thousands of commands--some of which mean different things in different situations--it doesn't have a reputation for being user-friendly.



Fortunately, there's help. This second edition of Cisco IOS in a Nutshell consolidates the most important commands and features of IOS into a single, well-organized volume that you'll find refreshingly user-friendly.



This handy, two-part reference covers IOS configuration for the TCP/IP protocol family. The first section includes chapters on the user interface, configuring lines and interfaces, access lists, routing protocols, and dial-on-demand routing and security. A brief, example-filled tutorial shows you how to accomplish common tasks.



The second part is a classic O'Reilly quick reference to all the commands for working with TCP/IP and the lower-level protocols on which it relies. Brief descriptions and lists of options help you zero in on the commands you for the task at hand. Updated to cover Cisco IOS Software Major Release 12.3, this second edition includes lots of examples of the most common configuration steps for the routers themselves. It's a timely guide that any network administrator will come to rely on.



book cover
Cisco IOS in a Nutshell, 2nd Edition
By James Boney
...............................................
Publisher: O'Reilly
Pub Date: August 2005
ISBN: 0-596-00869-4
Pages: 796
 

Table of Contents  | Index

   Copyright
   Preface
      Organization
      What's New in This Edition
      Conventions
      Safari Enabled
      We'd Like to Hear from You
      Acknowledgments
      Chapter 1.  Getting Started
      Section 1.1.  IOS User Modes
      Section 1.2.  Command-Line Completion
      Section 1.3.  Get to Know the Question Mark
      Section 1.4.  Command-Line Editing Keys
      Section 1.5.  Pausing Output
      Section 1.6.  show Commands
      Chapter 2.  IOS Images and Configuration Files
      Section 2.1.  IOS Image Filenames
      Section 2.2.  The New Cisco IOS Packaging Model
      Section 2.3.  Loading Image Files Through the Network
      Section 2.4.  Using the IOS Filesystem for Images
      Section 2.5.  The Router's Configuration
      Section 2.6.  Loading Configuration Files
      Chapter 3.  Basic Router Configuration
      Section 3.1.  Setting the Router Name
      Section 3.2.  Setting the System Prompt
      Section 3.3.  Configuration Comments
      Section 3.4.  The Enable Password
      Section 3.5.  Mapping Hostnames to IP Addresses
      Section 3.6.  Setting the Router's Time
      Section 3.7.  Enabling SNMP
      Section 3.8.  Cisco Discovery Protocol
      Section 3.9.  System Banners
      Chapter 4.  Line Commands
      Section 4.1.  The line Command
      Section 4.2.  The Console Port
      Section 4.3.  Virtual Terminals (VTYs)
      Section 4.4.  Asynchronous Ports (TTYs)
      Section 4.5.  The Auxiliary (AUX) Port
      Section 4.6.  show line
      Section 4.7.  Reverse Telnet
      Section 4.8.  Common Configuration Items
      Chapter 5.  Interface Commands
      Section 5.1.  Naming and Numbering Interfaces
      Section 5.2.  Basic Interface Configuration Commands
      Section 5.3.  The Loopback Interface
      Section 5.4.  The Null Interface
      Section 5.5.  Ethernet, Fast Ethernet, and Gigabit Ethernet Interfaces
      Section 5.6.  Token Ring Interfaces
      Section 5.7.  ISDN Interfaces
      Section 5.8.  Serial Interfaces
      Section 5.9.  Asynchronous Interfaces
      Section 5.10.  Interface show Commands
      Chapter 6.  Networking Technologies
      Section 6.1.  Frame Relay
      Section 6.2.  ATM
      Section 6.3.  DSL
      Section 6.4.  Cable
      Section 6.5.  VoIP
      Chapter 7.  Access Lists
      Section 7.1.  How Packets Match a List Entry
      Section 7.2.  Types of Access Lists
      Section 7.3.  Specific Topics
      Chapter 8.  IP Routing Topics
      Section 8.1.  Autonomous System (AS) Numbers
      Section 8.2.  Interior and Exterior Gateway Protocols
      Section 8.3.  Distance-Vector and Link-State Routing Protocols
      Section 8.4.  Static Routes
      Section 8.5.  Split Horizon
      Section 8.6.  Passive Interfaces
      Section 8.7.  Fast Switching and Process Switching
      Chapter 9.  Interior Routing Protocols
      Section 9.1.  RIP
      Section 9.2.  IGRP
      Section 9.3.  EIGRP
      Section 9.4.  OSPF
      Section 9.5.  IS-IS
      Chapter 10.  Border Gateway Protocol
      Section 10.1.  Introduction to BGP
      Section 10.2.  A Simple BGP Configuration
      Section 10.3.  Route Filtering
      Section 10.4.  An Advanced BGP Configuration
      Section 10.5.  Neighbor Authentication
      Section 10.6.  Peer Groups
      Section 10.7.  Route Reflectors
      Section 10.8.  BGP Confederacies
      Section 10.9.  BGP TTL Security
      Chapter 11.  Quality of Service
      Section 11.1.  Marking
      Section 11.2.  Older Queuing Methods
      Section 11.3.  Modern IOS QoS Tools
      Section 11.4.  Congestion Avoidance
      Section 11.5.  Traffic Policing
      Section 11.6.  Traffic Shaping
      Section 11.7.  AutoQoS
      Section 11.8.  QoS Device Manager
      Chapter 12.  Dial-on-Demand Routing
      Section 12.1.  Configuring a Simple DDR Connection
      Section 12.2.  Sample Legacy DDR Configurations
      Section 12.3.  Dialer Interfaces (Dialer Profiles)
      Section 12.4.  Multilink PPP
      Section 12.5.  Snapshot DDR
      Chapter 13.  Specialized Networking Topics
      Section 13.1.  Bridging
      Section 13.2.  Hot Standby Routing Protocol (HSRP)
      Section 13.3.  Network Address Translation (NAT)
      Section 13.4.  Tunnels
      Section 13.5.  Encrypted Tunnels
      Section 13.6.  Multicast Routing
      Section 13.7.  Multiprotocol Label Switching (MPLS)
      Chapter 14.  Switches and VLANs
      Section 14.1.  Switch Terminology
      Section 14.2.  IOS on Switches
      Section 14.3.  Basic Switch Configuration
      Section 14.4.  Trunking
      Section 14.5.  Switch Monitor Port for IDS or Sniffers
      Section 14.6.  Troubleshooting Switches
      Chapter 15.  Router Security
      Section 15.1.  Securing Enable Mode Access
      Section 15.2.  Routine Security Measures
      Section 15.3.  Restricting Access to Your Router
      Chapter 16.  Troubleshooting and Logging
      Section 16.1.  ping
      Section 16.2.  trace
      Section 16.3.  Debugging
      Section 16.4.  Logging
      Chapter 17.  Quick Reference
      aaa accounting
      aaa accounting delay-start
      aaa accounting gigawords
      aaa accounting nested
      aaa accounting resource
      aaa accounting send stop-record authentication failure
      aaa accounting session-duration ntp-adjusted
      aaa accounting suppress null-username
      aaa accounting update
      aaa authentication attempts login
      aaa authentication banner
      aaa authentication enable default
      aaa authentication fail-message
      aaa authentication local-override
      aaa authentication login
      aaa authentication password-prompt
      aaa authentication ppp
      aaa authentication username-prompt
      aaa authorization
      aaa authorization config-commands
      aaa authorization reverse-access
      aaa authorization template
      aaa configuration route
      aaa group server radius
      aaa group server tacacs+
      aaa new-model
      absolute-timeout
      access-class
      access-enable
      access-list
      access-list rate-limit
      access-template
      activation-character
      aggregate-address
      alias
      area authentication
      area default-cost
      area nssa
      area-password
      area range
      area stub
      area virtual-link
      arp (global)
      arp (interface)
      arp timeout
      async-bootp
      async default ip address
      async default routing
      async dynamic address
      async dynamic routing
      async mode
      atm address
      atm arp-server
      atm esi-address
      atm lecs-address
      atm lecs-address-default
      atm nsap-address
      atm pvc
      atm-vc
      autobaud
      autocommand
      autodetect encapsulation
      autohangup
      auto discovery qos
      auto qos voip
      auto secure
      autoselect
      auto-summary
      backup
      bandwidth (interface)
      bandwidth (policy-map)
      banner exec
      banner incoming
      banner login
      banner motd
      bgp always-compare-med
      bgp bestpath as-path ignore
      bgp bestpath med-confed
      bgp bestpath missing-as-worst
      bgp client-to-client reflection
      bgp cluster-id
      bgp confederation identifier
      bgp confederation peers
      bgp dampening
      bgp default local-preference
      bgp default route-target filter
      bgp deterministic med
      bgp fast-external-fallover
      bgp log-neighbor-changes
      bgp-policy
      bridge acquire
      bridge address
      bridge cmf
      bridge crb
      bridge forward-time
      bridge-group
      bridge-group aging-time
      bridge-group circuit-group
      bridge-group input-address-list
      bridge-group input-lsap-list
      bridge-group input-pattern
      bridge-group input-type-list
      bridge-group output-address-list
      bridge-group output-lsap-list
      bridge-group output-pattern
      bridge-group output-type-list
      bridge-group path-cost
      bridge-group priority
      bridge-group spanning-disabled
      bridge hello-time
      bridge irb
      bridge max-age
      bridge multicast-source
      bridge priority
      bridge protocol
      bridge route
      busy-message
      cable helper-address
      calendar set
      callback forced-wait
      cd
      cdp advertise-v2
      cdp enable
      cdp holdtime
      cdp run
      cdp timer
      channel-group (controller)
      channel-group (interface)
      chat-script
      class (frame-relay)
      class (MPLS)
      class (policy-map)
      class-map
      clear
      client-atm-address name
      clock calendar-valid
      clock rate
      clock read-calendar
      clock set
      clock summer-time
      clock timezone
      clock update-calendar
      compress
      config-register
      configure
      controller
      copy
      crc
      custom-queue-list
      databits
      data-character-bits
      dce-terminal-timing enable
      debug
      default-information
      default-information originate
      default-metric
      default-name
      delay
      delete
      description
      dialer aaa
      dialer callback-secure
      dialer callback-server
      dialer caller
      dialer dtr
      dialer enable-timeout
      dialer fast-idle
      dialer-group
      dialer hold-queue
      dialer idle-timeout
      dialer in-band
      dialer isdn
      dialer-list
      dialer load-threshold
      dialer map
      dialer map snapshot
      dialer max-link
      dialer pool
      dialer pool-member
      dialer priority
      dialer remote-name
      dialer rotary-group
      dialer rotor
      dialer string
      dialer wait-for-carrier-time
      dialer watch-disable
      dialer watch-group
      dialer watch-list
      dir
      disable
      disconnect
      disconnect-character
      disconnect ssh
      dispatch-character
      distance
      distance bgp
      distance eigrp
      distribute-list in
      distribute-list out
      domain-password
      downward-compatible-config
      down-when-looped
      drop
      dte-invert-txc
      early-token-release
      editing
      eigrp log-neighbor-changes
      enable
      enable last-resort
      enable password
      enable secret
      enable use-tacacs
      encapsulation (ATM/MPLS)
      encapsulation (interface)
      end
      erase
      escape-character
      exception core-file
      exception dump
      exception memory
      exception protocol
      exception spurious-interrupt
      exec
      exec-timeout
      exit
      fair-queue (policy-map class)
      fair-queue (interface)
      fair-queue aggregate-limit
      fair-queue individual-limit
      fair-queue limit
      fair-queue qos-group
      fair-queue tos
      fair-queue weight
      fddi burst-count
      fddi c-min
      fddi cmt-signal-bits
      fddi duplicate-address-check
      fddi encapsulate
      fddi frames-per-token
      fddi smt-frames
      fddi tb-min
      fddi tl-min-time
      fddi token-rotation-time
      fddi t-out
      fddi valid-transmission-time
      flowcontrol
      format
      frame-relay adaptive-shaping
      frame-relay [ bc | be]
      frame-relay becn-response-enable
      frame-relay broadcast-queue
      frame-relay cir
      frame-relay class
      frame-relay custom-queue-list
      frame-relay de-group
      frame-relay de-list
      frame-relay idle-timer
      frame-relay interface-dlci
      frame-relay intf-type
      frame-relay inverse-arp
      frame-relay ip rtp header-compression
      frame-relay ip tcp header-compression
      frame-relay lmi-type
      frame-relay local-dlci
      frame-relay map
      frame-relay map bridge
      frame-relay map clns
      frame-relay map ip compress
      frame-relay map ip rtp header-compression
      frame-relay map ip tcp header-compression
      frame-relay mincir
      frame-relay multicast-dlci
      frame-relay payload-compress packet-by-packet
      frame-relay priority-dlci-group
      frame-relay priority-group
      frame-relay route
      frame-relay svc
      frame-relay switching
      frame-relay traffic-rate
      frame-relay traffic-shaping
      fsck
      ftp-server enable
      ftp-server topdir
      full-duplex
      full-help
      group-range
      half-duplex
      half-duplex controlled-carrier
      help
      history
      hold-character
      hold-queue
      hostname
      hssi external-loop-request
      hssi internal-clock
      hub
      ignore-dcd
      interface
      interface bvi
      interface dialer
      interface group-async
      ip access-group
      ip access-list
      ip accounting
      ip accounting-list
      ip accounting-threshold
      ip accounting-transits
      ip address
      ip address negotiated
      ip address-pool
      ip alias
      ip as-path access-list
      ip authentication
      ip bandwidth-percent eigrp
      ip bgp-community new-format
      ip bootp server
      ip broadcast-address
      ip cef
      ip cef traffic-statistics
      ip cgmp
      ip classless
      ip community-list
      ip default-gateway
      ip default-network
      ip dhcp-server
      ip directed-broadcast
      ip domain-list
      ip domain-lookup
      ip domain-name
      ip dvmrp accept-filter
      ip dvmrp auto-summary
      ip dvmrp default-information
      ip dvmrp metric
      ip dvmrp metric-offset
      ip dvmrp output-report-delay
      ip dvmrp reject-non-pruners
      ip dvmrp routehog-notification
      ip dvmrp route-limit
      ip dvmrp summary-address
      ip dvmrp unicast-routing
      ip forward-protocol
      ip ftp passive
      ip ftp password
      ip ftp source-interface
      ip ftp username
      ip hello-interval eigrp
      ip helper-address
      ip hold-time eigrp
      ip host
      ip http
      ip identd
      ip igmp access-group
      ip igmp explicit-tracking
      ip igmp helper-address
      ip igmp join-group
      ip igmp query-interval
      ip igmp query-max-response-time
      ip igmp query-timeout
      ip igmp static-group
      ip igmp version
      ip irdp
      ip load-sharing
      ip local policy route-map
      ip local pool
      ip mask-reply
      ip mroute
      ip mroute-cache
      ip mtu
      ip multicast boundary
      ip multicast cache-headers
      ip multicast helper-map
      ip multicast rate-limit
      ip multicast-routing
      ip multicast ttl-threshold
      ip name-server
      ip nat
      ip nat inside destination
      ip nat inside source
      ip nat outside source
      ip nat pool
      ip nat stateful id
      ip nat translation
      ip nbar pdlm
      ip nbar port-map
      ip nbar protocol-discovery
      ip netmask-format
      ip nhrp authentication
      ip nhrp holdtime
      ip nhrp interest
      ip nhrp map
      ip nhrp map multicast
      ip nhrp max-send
      ip nhrp network-id
      ip nhrp nhs
      ip nhrp record
      ip nhrp responder
      ip nhrp server-only
      ip nhrp trigger-svc
      ip nhrp use
      ip ospf authentication
      ip ospf authentication-key
      ip ospf cost
      ip ospf dead-interval
      ip ospf demand-circuit
      ip ospf hello-interval
      ip ospf message-digest-key
      ip ospf name-lookup
      ip ospf network
      ip ospf priority
      ip ospf retransmit-interval
      ip ospf transmit-delay
      ip pim
      ip pim accept-rp
      ip pim message-interval
      ip pim minimum-vc-rate
      ip pim multipoint-signalling
      ip pim nbma-mode
      ip pim neighbor-filter
      ip pim query-interval
      ip pim rp-address
      ip pim rp-announce-filter
      ip pim send-rp-announce
      ip pim send-rp-discovery
      ip pim vc-count
      ip pim version
      ip policy-list
      ip policy route-map
      ip proxy-arp
      ip radius source-interface
      ip rarp-server
      ip rcmd rcp-enable
      ip rcmd remote-host
      ip rcmd remote-username
      ip rcmd rsh-enable
      ip redirects
      ip rip authentication
      ip rip receive version
      ip rip send version
      ip rip triggered
      ip rip v2-broadcast
      ip route
      ip route-cache
      ip route-cache policy
      ip route priority high
      ip route profile
      ip router isis
      ip routing
      ip rtp compression-connections
      ip rtp header-compression
      ip rtp priority
      ip scp server enable
      ip source-route
      ip split-horizon
      ip ssh
      ip subnet-zero
      ip summary-address eigrp
      ip summary-address rip
      ip tcp chunk-size
      ip tcp compression-connections
      ip tcp header-compression
      ip tcp mtu-path-discovery
      ip tcp queuemax
      ip tcp synwait-time
      ip tcp window-size
      ip telnet source-interface
      ip tftp source-interface
      ip unnumbered
      ip unreachables
      isdn answer1, isdn answer2
      isdn autodetect
      isdn bchan-number-order
      isdn busy
      isdn caller
      isdn call interface
      isdn calling-number
      isdn conference-code
      isdn disconnect interface
      isdn fast-rollover-delay
      isdn incoming-voice
      isdn leased-line bri 128
      isdn not-end-to-end
      isdn nsf-service
      isdn outgoing-voice
      isdn overlap-receiving
      isdn send-alerting
      isdn sending-complete
      isdn service
      isdn spid1 (spid2)
      isdn switch-type
      isdn tei
      isdn tei-negotiation
      isdn transfer-code
      isdn twait-disable
      isdn voice-priority
      isis advertise-prefix
      isis authentication key-chain
      isis authentication mode
      isis authentication send-only
      isis circuit-type
      isis csnp-interval
      isis hello-interval
      isis hello-multiplier
      isis lsp-interval
      isis metric
      isis password
      isis priority
      isis retransmit-interval
      isis retransmit-throttle-interval
      is-type
      keepalive
      key
      key chain
      key config-key
      key-string
      lane auto-config-atm-address
      lane bus-atm-address
      lane client
      lane client-atm-address
      lane config-atm-address
      lane config database
      lane database
      lane fixed-config-atm-address
      lane global-lecs-address
      lane le-arp
      lane server-atm-address
      lane server-bus
      line
      linecode
      link-test
      location
      logging
      logging buffered
      logging buffered xml
      logging console
      logging console xml
      logging count
      logging facility
      logging history
      logging history size
      logging host
      logging monitor
      logging on
      logging source-interface
      logging synchronous
      logging trap
      login
      login authentication
      logout-warning
      loopback
      mac-address-table aging-time
      mac-address-table dynamic
      mac-address-table secure
      mac-address-table static
      map-class dialer
      map-class frame-relay
      map-group
      map-list
      match access-group
      match any
      match as-path
      match class-map
      match community-list
      match cos
      match destination-address mac
      match discard-class
      match dscp
      match fr-dlci
      match input-interface
      match interface
      match ip address
      match ip dscp
      match ip next-hop
      match ip precedence
      match ip route-source
      match ip rtp
      match length
      match metric
      match mpls experimental
      match mpls-label
      match not
      match packet length
      match precedence
      match protocol
      match qos-group
      match route-type
      match source-address mac
      match tag
      maximum-paths
      max-reserved-bandwidth
      media-type
      member
      menu
      menu command
      menu text
      menu title
      metric holddown
      metric maximum-hops
      metric weights
      mkdir
      modem
      monitor session
      more
      motd-banner
      mpls atm control-vc
      mpls atm cos
      mpls atm disable-headend-vc
      mpls atm multi-vc
      mpls atm vpi
      mpls atm vp-tunnel
      mpls cos-map
      mpls ip
      mpls ip default-route
      mpls ip encapsulate explicit-null
      mpls ip ttl-expiration pop
      mpls label protocol
      mpls label range
      mpls mtu
      mpls prefix-map
      mpls request-labels for
      mrinfo
      mstat
      mtrace
      mtu
      name elan-id
      name local-seg-id
      name preempt
      name server-atm-address
      neighbor
      neighbor advertisement-interval
      neighbor database-filter
      neighbor default-originate
      neighbor description
      neighbor distribute-list
      neighbor filter-list
      neighbor maximum-prefix
      neighbor next-hop-self
      neighbor password
      neighbor peer-group
      neighbor prefix-list
      neighbor remote-as
      neighbor route-map
      neighbor route-reflector-client
      neighbor send-community
      neighbor send-label
      neighbor shutdown
      neighbor soft-reconfiguration inbound
      neighbor ttl-security
      neighbor timers
      neighbor ttl-security
      neighbor update-source
      neighbor version
      neighbor weight
      net
      network
      network backdoor
      network weight
      nrzi-encoding
      ntp access-group
      ntp authenticate
      ntp authentication-key
      ntp broadcast
      ntp broadcast client
      ntp broadcastdelay
      ntp disable
      ntp master
      ntp peer
      ntp server
      ntp source
      ntp trusted-key
      ntp update-calendar
      offset-list
      ospf auto-cost reference-bandwidth
      ospf log-adj-changes
      output-delay
      padding
      parity
      passive-interface
      password
      peer default ip address
      peer neighbor-route
      physical-layer
      ping
      police
      policy-map
      ppp
      ppp authentication
      ppp bridge ip
      ppp chap
      ppp compress
      ppp multilink
      ppp quality
      ppp reliable-link
      ppp use-tacacs
      priority-group
      priority-list
      privilege level (global)
      privilege level (line)
      prompt
      pulse-time
      pvc
      qos pre-classify
      queue-limit
      queue-list
      radius-server
      random-detect
      random-detect discard-class
      random-detect discard-class-based
      random-detect dscp
      random-detect ecn
      random-detect exponential-weighting-constant
      random-detect flow
      rate-limit
      redistribute
      refuse-message
      reload
      rename
      ring-speed
      rlogin
      rmdir
      route-map
      router
      rsh
      rxspeed
      send
      service
      service compress-config
      service linenumber
      service-module 56k
      service-module t1
      service-policy (interface)
      service-policy (policy-map)
      service timestamps
      session-limit
      session-timeout
      set as-path
      set atm-clp
      set automatic-tag
      set community
      set cos
      set default interface
      set discard-class
      set dscp
      set fr-de
      set interface
      set ip default next-hop
      set ip next-hop
      set ip precedence
      set ip tos
      set level
      set local-preference
      set metric
      set metric-type
      set metric-type internal
      set mpls-label
      set origin
      set ospf router-id
      set-overload-bit
      set precedence
      set qos-group
      set tag
      setup
      set weight
      shape
      show
      shutdown
      smt-queue-threshold
      snapshot
      snmp-server
      snmp-server chassis-id
      snmp-server community
      snmp-server contact
      snmp-server enable traps
      snmp-server engine-id
      snmp-server group
      snmp-server host
      snmp-server location
      snmp-server packetsize
      snmp-server queue-length
      snmp-server system-shutdown
      snmp-server tftp-server-list
      snmp-server trap-source
      snmp-server trap-timeout
      snmp-server user
      snmp-server view
      snmp trap link-status
      source-address
      spanning-tree backbonefast
      spanning-tree cost
      spanning-tree port-priority
      spanning-tree vlan
      speed
      squeeze
      squelch
      sscop cc-timer
      sscop keepalive-timer
      sscop max-cc
      sscop poll-timer
      sscop rcv-window
      sscop send-window
      standby authentication
      standby ip
      standby preempt
      standby priority
      standby timers
      standby track
      stopbits
      summary-address
      synchronization
      table-map
      tacacs-server attempts
      tacacs-server authenticate
      tacacs-server directed-request
      tacacs-server extended
      tacacs-server host
      tacacs-server key
      tacacs-server last-resort
      tacacs-server notify
      tacacs-server optional-passwords
      tacacs-server retransmit
      tacacs-server timeout
      tag-switching
      terminal editing
      terminal escape-character
      terminal history
      terminal length
      terminal monitor
      tftp-server
      timers basic
      timers bgp
      timers spf
      trace, traceroute
      traffic-shape adaptive
      traffic-shape fecn-adapt
      traffic-shape group
      traffic-shape rate
      traffic-share
      transport
      tunnel checksum
      tunnel destination
      tunnel key
      tunnel mode
      tunnel sequence-datagrams
      tunnel source
      txspeed
      undebug
      undelete
      username
      vacant-message
      validate-update-source
      variance
      verify
      version
      vlan
      vlan database
      vtp client
      vtp domain
      vtp password
      vtp server
      vtp transparent
      vtp v2-mode
      vty-async
      vty-async dynamic-routing
      vty-async header-compression
      vty-async keepalive
      vty-async mtu
      vty-async ppp authentication
      vty-async ppp use-tacacs
      width
      write
      Appendix A.  Appendix: Network Basics
      Section A.1.  IPv4 Subnetting
      Section A.2.  OSI Reference Model
      Section A.3.  IPv6
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