Cisco Systems C819HG4GVK9 No half-duplex controlled-carrier, Places a low-speed serial interface

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Chapter 8 Configuring the Serial Interface

How to Configure Serial Interfaces

4.The DCE transitions to the wait DCD drop delay state. This state causes a time delay between the transmission of the last frame and the deassertion of DCD in the controlled-carrier mode for DCE transmits.

5.When the timer expires, the DCE deasserts DCD and transitions back to the ready state and stays there until there is a frame to transmit on that interface.

As shown in Figure 6, the half-duplex DCE receive state machine idles in the ready state when it is quiescent. It transitions out of this state when the DTE asserts RTS. In response, the DCE starts a timer based on the value specified using the cts-delaycommand. This timer delays the assertion of CTS because some DTE interfaces expect this delay. (The default value of this timer is 0 ms; use the half-duplex timer cts-delayinterface configuration command to specify a delay value.)

Figure 6

Half-Duplex DCE Receive State Machine

 

 

 

 

When the timer expires, the DCE state machine asserts CTS and transitions to the receive state. It stays in the receive state until there is a frame to receive. If the beginning of a giant frame is received, it transitions to the in giant state and keeps discarding all the fragments of the giant frame and transitions back to the receive state.

Transitions back to the ready state occur when RTS is deasserted by the DTE. The response of the DCE to the deassertion of RTS is to deassert CTS and go back to the ready state.

Placing a Low-Speed Serial Interface in Constant-Carrier Mode

To return a low-speed serial interface to constant-carrier mode from controlled-carrier mode, use the following command in interface configuration mode.

SUMMARY STEPS

1.no half-duplex controlled-carrier

DETAILED STEPS

 

Command or Action

Purpose

 

 

 

Step 1

no half-duplex controlled-carrier

Places a low-speed serial interface in

 

 

constant-carrier mode.

 

Example:

 

 

Router(config-if)# no half-duplex controlled-carrier

 

 

 

 

 

 

Cisco 819 Series Integrated Services Routers Software Configuration Guide

 

 

 

 

 

 

OL-23590-02

 

 

8-17

 

 

 

 

 

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Contents Text Part Number OL-23590-02 September 2 Americas HeadquartersPage N T E N T S Data Account Provisioning Configuring a Cellular Interface Specifying a Synchronous Serial Interface Create a Cisco Easy VPN Remote Configuration NAT Getting Help TACACS+ OL-23590-02 General Description Product Overview1shows the Cisco 819HG ISR 3G Features New FeaturesSKU Information Platform Features Wlan FeaturesSecurity Features ScanSafe Wireless Device OverviewLEDs Tftp support with Ethernet WAN interfaceColor Description Rssi Router# show controllers cellular Wlan Features Wireless Local Area NetworkDual-Radio LEDs CleanAir TechnologyImages Supported Dynamic Frequency SelectionWlan LED OL-23590-02 4G LTE Wireless WAN OL-23590-02 Basic Router Configuration Interface Ports Default ConfigurationRouter Interface Port Label Information Needed for Configuration OL-23590-02 Line aux console tty vty line-number Password password Login Configuring Command-Line AccessExample Command PurposePrivileged Exec mode Enables password checking at the virtual terminalSession login Exits line configuration mode and returns toConfiguring Global Parameters Configuring a Gigabit Ethernet WAN Interface Configuring WAN InterfacesNo shutdown Exit Example Configuring the Cellular Wireless WAN InterfaceRestrictions for Configuring the Cellular Wireless Interface Prerequisites for Configuring the 3G Wireless InterfaceData Account Provisioning Command or Action PurposeDisplays the cellular gps information Shows the radio signal strengthSignal strength, the network security, and so on Details about the command parametersCellular unit cdma activate manual mdn msid msl 2lists the modem data profile parametersActivation and Provisioning Process Carrier Manual ActivationCellular cdma activate iota Activating with Over-the-Air Service ProvisioningRouter # cellular 0 cdma activate otasp phonenumber Configuring a Cellular Interface Interface cellular Dialer string string Configuring DDREnters the global configuration mode Enters global configuration modeEnables DDR and configures the specified serial Specifies the number of the dialer access group toConfigures this line for GSM Specifies the line configuration mode. It is alwaysSpecifies a default modem chat script Exits line configuration modeThis section provides the following configuration examples Examples for Configuring Cellular Wireless InterfacesFollowing shows how to configure an HSPA+ modem Tunnel over Cellular Interface ConfigurationCommand Syntax Description Configuring Dual SIM for Cellular NetworksLocks or unlocks the SIM Perform the following commands to manually switch the SIMFollowing command forces the modem to connect to SIM1 Cellular GSM SIMOutput When Button Is Pushed Example Output When Button Is Not Pushed ExampleRommon Behavior IOS Behavior Configuring the Fast Ethernet LAN Interfaces Configuring a Loopback InterfacePush Button in Wlan AP Router# show interface loopback Verifying ConfigurationAnother way to verify the loopback interface is to ping it Configuring Static RoutesVerifying Configuration Configuring Dynamic RoutesExample No auto-summary End Configuring Routing Information ProtocolCommand Task Router rip Version 1Router eigrp as-number Configuring Enhanced Interior Gateway Routing ProtocolNumber identifies the route to other Eigrp routers Enters router configuration mode and enablesBe applied, using the IP address of the network Eigrp on the router. The autonomous-systemOL-23590-02 Configuring Backup Interfaces Configuring Backup Data Lines and Remote Management819 Yes Be configured to back up a serial 0 interface Enters interface configuration mode forInterface for which you want to configure backup Assigns an interface as the secondary or backupDialer watch group group-number Configuring Cellular Dial-on-Demand Routing BackupConfiguring DDR Backup Using Dialer Watch Configure terminalSpecifies the interface Enables dialer watch on the backup interfaceDo not use the access list permit all command to Using the chat script commandConfiguring DDR Backup Using Floating Static Route No aaa new-model Source-interface Dialer2 Line vty 0 4 login Scheduler max-task-time Webvpn cef end Dial Backup and Remote Management Through the Auxiliary Port Ip name-server server-address Ip dhcp pool name Exit Pool configuration mode, see the Example Enters Dhcp pool configuration mode. The nameConfigure the Dhcp address pool. For Sample commands that you can use in DhcpEnters configuration mode for the line interface Enables hardware signal flow control Switches the port from console to auxiliary portExits the configure interface mode Enters configuration mode for the auxiliaryPpp authentication pap callin PC IP address behind CPE OL-23590-02 Router# show environment Environmental and Power ManagementCisco EnergyWise Support Environmental and Power Management Cisco EnergyWise SupportWAN Concentration Configuring the Serial InterfaceProduct Number Cable Type Length Connector Type Configuring Serial InterfacesLegacy Protocol Transport Cisco Hdlc Encapsulation Information About Configuring Serial InterfacesPPP Encapsulation Multilink PPP Keepalive TimerFrame Relay Encapsulation This section contains the following tasks How to Configure Serial InterfacesConfiguring a Synchronous Serial Interface LMI on Frame Relay InterfacesSpecifying a Synchronous Serial Interface Configures synchronous serial encapsulationSpecifying Synchronous Serial Encapsulation Configures an Sdlc interface for half-duplex mode Configuring PPPSignals Nrzi-encoding Configuring Compression of Hdlc DataUsing the Nrzi Line-Coding Format Encapsulation hdlc Compress stacInvert txclock Invert rxclock Inverting the Transmit Clock SignalEnabling the Internal Clock Transmit-clock-internalConfiguring DTR Signal Pulsing Setting Transmit DelayIgnoring DCD and Monitoring DSR as Line Up/Down Indicator Ignore-dcd Dce-terminal-timing enableConfigures the DCE to use Scte from the DTE Specifying the Serial Network Interface Module TimingDte-invert-txc Specifies timing configuration to invert TXC clockUnderstanding Half-Duplex DTE and DCE State Machines Configuring Low-Speed Serial InterfacesHalf-Duplex DCE State Machines Half-Duplex DCE Transmit State Machine No half-duplex controlled-carrier Constant-carrier modePlaces a low-speed serial interface Changing Between Synchronous and Asynchronous Modes Sdlc cts-delay Sdlc rts-timeoutPhysical-layer sync async No physical-layer Configuration ExamplesInterface Enablement Configuration Examples Returns the interface to its default mode, which isHalf-Duplex Timers Example Synchronous or Asynchronous Mode ExamplesLow-Speed Serial Interface Examples Authentication, Authorization, and Accounting Configuring Security FeaturesACL Type Configuring AutoSecureConfiguring Access Lists Configuration CommandsAccess Groups Configuring Cisco IOS FirewallConfiguring VPN Configuring Cisco IOS IPSURL Filtering Remote Access VPN Corporate office network Site-to-Site VPNBranch office containing multiple LANs and VLANs VPN client-Cisco 819 ISRConfigure a VPN over an IPSec Tunnel Configuration ExamplesConfigure the IKE Policy Command or Action Purpose Domain name Exit Configure Group Policy InformationSpecifies a local address pool for the group Apply Mode Configuration to the Crypto MapExits IKE group policy configuration mode For details about this command and additionalEnable Policy Lookup Configure the IPSec Crypto Method and Parameters Configure IPSec Transforms and ProtocolsCrypto ipsec profile profile-name See Cisco IOS Security Command Reference for Apply the Crypto Map to the Physical Interface Where to Go NextCrypto map map-name Exit Crypto ipsec client ezvpn name Create a Cisco Easy VPN Remote ConfigurationCrypto ipsec client ezvpn name outside inside Exit Configuration Example Configure a Site-to-Site GRE Tunnel Creates a tunnel interface and enters interface Returns to global configuration mode No cdp run 10-1 Configuring the Ethernet SwitchesSwitch Port Numbering and Naming Restrictions for the FE SwitchInformation About Ethernet Switches Storm Control Switched Port AnalyzerOverview of Snmp MIBs Igmp Snooping10-4 BRIDGE-MIB for Layer 2 Ethernet SwitchingRouterconfig#snmp-server community public RW MIBs MIBs Link10-5 MAC Address Notification10-6 How to Configure Ethernet SwitchesConfiguring VLANs VLANs on the FE PortsComand Purpose Configuring Layer 2 InterfacesSwitchport mode dynamic desirable VLANs on the GE PortConfiguring Spanning Tree Protocol Configuring 802.1x Authentication10-8 10-9 Configuring MAC Table ManipulationConfiguring Cisco Discovery Protocol Port SecurityConfiguring Per-Port Storm Control Configuring the Switched Port AnalyzerConfiguring IP Multicast Layer 3 Switching Configuring Igmp Snooping10-11 Configuring Fallback Bridging10-12 Managing the Switch11-1 Configuring PPP over Ethernet with NAT11-2 Configuration TasksConfigure the Virtual Private Dialup Network Group Number PPPoE11-3 Configure the Fast Ethernet WAN Interfaces11-4 Configure the Dialer Interface11-5 Ip address negotiated Ip mtu bytes11-6 Configure Network Address Translation11-7 Ip nat inside outside No shutdown Exit11-8 11-9 Configuration Example11-10 11-11 Verifying Your Configuration11-12 12-1 Configuring a LAN with Dhcp and VLANsVLANs Configure Dhcp12-2 12-3 Detailed Steps12-4 Verify Your Dhcp ConfigurationVlan ? Configure VLANs12-5 12-6 Assign a Switch Port to a VlanSwitchport access vlan vlan-id End Example12-7 Verify Your Vlan ConfigurationRouter# vlan database 12-812-9 Router# show vlan-switch12-10 13-1 Configuring a VPN Using Easy VPN and an IPSec TunnelVPN server-Easy VPN server Cisco Easy VPNRemote, networked users VPN client-Cisco 819 ISRs13-3 Configure the IKE PolicyLifetime seconds Exit 13-5 Configure Group Policy InformationInternet Naming Service Wins servers For the group by using the wins command13-6 Apply Mode Configuration to the Crypto MapLogin, and specifies the method used Enable Policy Lookup13-7 Configure the IPSec Crypto Method and Parameters Configure IPSec Transforms and Protocols13-8 13-9 Apply the Crypto Map to the Physical Interface Create an Easy VPN Remote Configuration13-10 13-11 Mode client network-extension network extension plus ExitFollowing example verifies your easy vpn connection Verifying Your Easy VPN Configuration13-12 13-13 13-14 Cisco IOS Software Basic Skills Configuring the Router from a PCPC Operating System Terminal Emulation Software Understanding Command ModesAs interface atm To exit to user Exec Use this mode toGlobal Enter the configure User Exec Begin a session withRouter rip-from Configuration mode Routing protocol AppropriateGetting Help Router Enter one of the routerEntering Global Configuration Mode Enable Secret Passwords and Enable PasswordsYou can now make changes to your router configuration Command-Line Error Messages Using CommandsAbbreviating Commands Undoing CommandsWhere to Go Next Saving Configuration ChangesSummary OL-18906-02 Network Protocols ConceptsRouting Protocol Options Protocol Ideal Topology Metric Routing UpdatesEnhanced Igrp PPP Authentication ProtocolsChap EthernetDialer Watch Dial BackupBackup Interface Floating Static RoutesEasy IP Phase QoS PPP Fragmentation and Interleaving IP PrecedenceLow Latency Queuing Access ListsOL-18906-02 Entering the ROM Monitor Configure terminal Enters global configuration modeConfig-reg Resets the configuration register ROM MonitorPrompt increments with each new line ROM Monitor CommandsExits global configuration mode ReloadDisaster Recovery with Tftp Download Command DescriptionsCommand Description Variable Command Tftp Download Command VariablesRequired Variables Configures how the router displays file Using the Tftp Download CommandOptional Variables You will see an output similar to the following ExamplesType Embedded AP s Appendix C ROM Monitor Appendix C ROM Monitor Configuration Register Configuration RegisterChanging the Configuration Register Using Prompts Changing the Configuration Register ManuallyConsole Download Command DescriptionError Reporting Debug CommandsContext-Displays processor context for example Appendix C ROM Monitor Exiting the ROM Monitor Exiting the ROM MonitorPort Keyword Description Common Port AssignmentsAuthentication service Any private RJE serviceISO-Transport Service Access Point Procedure Call
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