The basic IOS configuration commands for each LAN and WAN protocol discussed in this chapter are summarized in Table 3-2 and in the following list. Now that you understand the LAN and WAN technologies that operate on the data link layer of the OSI reference model, we move on to discussing the network layer and configuring the Cisco IOS devices for the Internet Protocol (IP).

  • The interface major command is used to identify an interface by name and to begin configuring it. Naming conventions exist for fixed devices, devices with interchangeable interface cards, and devices with VIP cards.

  • Adding a description of each interface with the description subcommand is recommended for efficient administration and record keeping. The description appears in the show interfaces output for an interface.

  • The shutdown command causes an interface to be administratively down.

  • The encapsulation subcommand specifies the format of the data sent and the data-link protocol for an interface. LAN interfaces don't require this configuration usually, but WAN interfaces often do.

Table 3-2. Summary of IOS Configuration Commands for LAN and WAN
Protocol Relevant Commands Description/Purpose
Ethernet and Fast Ethernet media-type {aui, 10baseT, mii, 100basex} Tells the router which connection is active on the interface: AUI, RJ-45, or MII.
Fast Ethernet and Gigabit Ethernet full-duplex Enables full-duplex communication on an interface.
Token Ring ring-speed {4 16} Specifies ring speed as 4 Mbps or 16 Mbps.
  early-token-ring Enables early token release on an interface.
X.25 x25 address x121 address Defines the local X.121 address on an X.25 serial interface.
  x25 ips; x25 ops Configures, respectively, the input packet size and output packet size on the serial interface.
  x25 win; x25 wout Configures, respectively, the input window size and output window size.
Frame Relay frame-relay interface-dlci Sets the address DLCI on the interface.
  frame-relay lmi-type Sets the LMI type on the interface.
ATM atm pvc Specifies the permanent virtual circuits that exist on a given interface.
DSL set bridging Sets the bridging options on a Cisco600 (CBOS only).
  set interface Sets interface parameters on a Cisco600 (CBOS only).
ISDN isdn switch-type Specifies the type of switch to which the IOS device is connected.
  isdn spid1; isdn spid2 Specifies the SPID numbers for each BRI interface.
  pri- group timeslots Specifies relevant time slots for the controller interface.
T1 framing Specifies the framing protocol for channels on the controller interface.
  linecode Specifies the line-encoding protocol for channels on the controller interface.
Table 3-3. Summary of EXEC Commands for LAN and WAN
Command Description
show frame pvc Displays statistics for Frame Relay permanent virtual circuits.
show frame svc maplist : Displays statistics for Frame Relay switched virtual circuits.
show interfaces Displays statistics for device interfaces.
show x25 vc Displays statistics for X.25 virtual circuits.

Cisco Router Configuration
Cisco Router Configuration (2nd Edition)
ISBN: 1578702410
EAN: 2147483647
Year: 1999
Pages: 116 © 2008-2017.
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