|
|
Configuring Cisco 4000 Series Software
Configuring the Synchronous Serial Interfaces
This chapter describes the procedures for configuring Cisco IOS software for Cisco 4000 series routers, and contains the following sections:
To configure your router, you need to connect a terminal or PC running terminal emulation software to the router. Configuration requires access to the console port.
You configure Cisco 4000 series routers using the Cisco command interpreter, which is called the EXEC. You must log in to the router before you can enter an EXEC command. For security purposes, the EXEC has two levels of access to commands, user EXEC mode and privileged EXEC mode.
To enter the privileged mode you must enter the enable secret password.
The commands available in user EXEC mode are a subset of those available in privileged EXEC mode. Because many privileged-level EXEC commands are used to set operating parameters, you should password-protect these commands to prevent unauthorized use.
You use two commands to do this:
You must enter an enable secret password to gain access to privileged-level commands.
For maximum security, the passwords should be different. If you enter the same password for both during the setup script, the system will accept it, but you will receive a warning message indicating that you should enter a different password.
An enable secret password can contain from 1 to 25 uppercase and lowercase alphanumeric characters; an enable password can contain any number of uppercase and lowercase alphanumeric characters. In both cases, a number cannot be the first character. Spaces are also valid password characters; for example, "two words" is a valid password. Leading spaces are ignored; trailing spaces are recognized.
If you lose or forget your enable password, see the section "Recovering Lost Passwords" in the appendix "Troubleshooting the Initial Hardware Configuration."
You can configure the router following the procedures described in one of the following sections:
Follow the procedure that best fits the needs of your network configuration.
Before continuing the configuration process, check the current state of the router by entering the show version command. The show version command will display the release of Cisco IOS software that is available on the router.
You can configure the router manually if you prefer not to use the setup facility or AutoInstall. Take the following steps to configure the router manually:
To see the currently operating configuration, enter the command show running-config at the enable prompt:
To see the configuration in nonvolatile random-access memory (NVRAM), enter the command show config at the enable prompt.
To make your changes permanent, enter the command copy running-config startup-config at the enable prompt:
The router is now configured and will boot with the configuration you have entered.
The AutoInstall process is designed to configure the router automatically after connection to your WAN. In order for AutoInstall to work properly, a Transmission Control Protocol/Internet Protocol (TCP/IP) host on your network must be preconfigured to provide the required configuration files. The TCP/IP host may exist anywhere on the network as long as the following conditions are maintained:
This functionality is coordinated by your system administrator at the site where the TCP/IP host is located. You should not attempt to use AutoInstall unless the required files have been installed on the TCP/IP host.
Take the following steps to prepare your router for the AutoInstall process:
If you do not plan to use AutoInstall, do not connect the router's serial (WAN) cable to the channel service unit/data service unit (CSU/DSU). The router will attempt to run AutoInstall whenever you start it if the serial (WAN) connection is connected on both ends and the router does not have a configuration stored in NVRAM. It can take several minutes for the router to determine that AutoInstall is not set up to a remote TCP/IP host.
Once the router has determined that AutoInstall is not configured, it will default to the setup facility. If the serial (WAN) cable is not connected, the router will boot from Flash memory and go into the setup facility.
When you first start the setup program you must configure the global parameters, which are used for controlling system-wide settings.
Take the following steps to enter the global parameters:
Table 5-1 :
This completes the procedure to configure the global parameters.
When you have completed the setup facility, you might need to complete some additional configuration tasks. See the following sections:
If your router has an Ethernet network processor module installed, you need to configure the Ethernet ports.
Take the following steps to configure the Ethernet interfaces:
You need to select the type of media connection, AUI or 10BaseT, for one-port and dual-port Ethernet network processor modules. Enter one of the following commands in the router's configuration file to configure your selection of AUI or 10BaseT for each Ethernet interface on the router:
or
The following is an example of configuring the Ethernet 0 interface for an AUI connection:
For more information about the media-type command, refer to the Cisco IOS configuration guides and command references.
If you installed a new channelized T1/ ISDN PRI (CT1/PRI) network processor module, or if you want to change the configuration of an existing network processor module, you must enter configuration mode to configure or reconfigure the interface. If you replaced a CT1/PRI module that was previously configured, the system will recognize the new CT1/PRI module and bring it up with the existing configuration.
When you have verified that the new CT1/PRI module is recognized by the router, use the configure command to configure the new CT1/PRI module. Have the following information ready when you begin your configuration:
Take the following steps to complete a basic T1 configuration:
This completes the procedure to configure a channelized T1 interface.
If you installed a new channelized E1/ISDN PRI (CE1/PRI) network processor module or if you want to change the configuration of an existing network processor module, you must enter configuration mode to configure or reconfigure the interface. If you replaced a CE1/PRI module that was previously configured, the system will recognize the new CE1/PRI module and bring it up with the existing configuration.
When you have verified that the new CE1/PRI module is recognized by the router, use the configure command to configure the new CE1/PRI module. Have the following information ready when you begin your configuration:
Take the following steps to complete a basic E1 configuration.
This completes the procedure to configure a channelized E1 interface.
If your router has a ISDN BRI network processor module installed, you need to configure the ISDN BRI ports.
The BRI interface is configured to allow connection to ISDN WANs through an NT1 device.
Take the following steps to configure the BRI interfaces:
If you installed a new ATM network processor module or if you want to change the configuration of an existing module, you must enter the configuration mode. If you replaced an ATM network processor module that was previously configured, the system will recognize the new module and bring it up in the existing configuration.
When you have verified that the new ATM network processor module is recognized by the router, use the privileged-level configure command to configure the new module. You should have available the following information:
The following steps describe a basic ATM configuration using just PVCs. Press Return after each step.
If you have a serial network processor module installed, you need to configure the synchronous serial interfaces to allow connection to WANs through a CSU/DSU. Take the following steps to configure the serial ports:
The following sections describe the commands for configuring an external clock signal for a data communications equipment (DCE) interface and for configuring a port for NRZI encoding or 32-bit cyclic redundancy check (CRC). Configuration commands are executed from the privileged level of the EXEC command interpreter. (For G.703/G.704 interface configuration, see the section "Configuring G.703/G.704 Interfaces" later in this chapter.)
All interfaces support both data terminal equipment (DTE) and DCE modes, depending on the mode of the interface cable attached to the port. To use a port as a DTE interface, connect a DTE adapter cable to the port. When the system detects the DTE mode cable, it automatically uses the external timing signal. To use a port in DCE mode, you must connect a DCE interface cable and set the clock speed with the clockrate command. This section describes how to set the clock rate on a DCE port and, if necessary, how to invert the clock to correct a phase shift between the data and clock signals.
All DCE interfaces require a noninverted internal transmit clock signal, which is generated by the serial module. The default operation on a DCE interface is for the DCE device to generate its own transmit clock signal (TXC) and send it to the remote DTE. The remote DTE device returns the clock signal to the DCE. The clockrate command specifies the rate as a bits-per-second value. In the following example, the clock rate for the top serial interface on a dual-port serial module is defined as 72 kbps:
Use the no clockrate command to remove the clock rate for DTE operation. Following are the acceptable clock rate settings:
Speeds above 64 kbps (64000) are not supported for EIA/TIA-232. On all interface types, if your cable is too long, faster speeds might not work.
Systems that use long cables may experience high error rates when operating at higher transmission speeds. Slight variances in cable construction, temperature, and other factors can cause the clock and data signals to shift out of phase. If a DCE port is reporting a high number of error packets, the problem might be caused by a phase shift. Inverting the clock can often correct this shift.
When a port is operating in DCE mode, the default operation is for the attached DTE device to return the serial clock transmit external (SCTE) to the DCE port. The DCE sends serial clock transmit (SCT) and serial clock receive (SCR) clock signals to the DTE, and the DTE returns an SCTE clock signal to the DCE. If the DTE device does not return SCTE, you must use the dce-terminal-timing-enable command to configure the DCE port to use its own clock signal instead of the SCTE signal that would normally be returned from the DTE device.
To configure an interface to accept the internal clock generated by the serial module instead of the SCTE clock that is normally returned by the DTE device, specify the interface followed by the dceterminaltimingenable command. In the example that follows, the serial 0 port is configured to accept the internal clock signal:
To turn off this command, use the no dce-terminal-timing-enable command.
When the serial port is a DTE, the invert-txc command inverts the TXC clock signal it receives from the remote DCE. When the serial port is a DCE, this command inverts the clock signal to the remote DTE port. Use the no invert-txc command to change the clock signal back to its original phase. The no invert-txc command is redundant with the four-port serial module because the module will automatically discover the polarity of the clock and invert the signal.
All interfaces support both nonreturn to zero (NRZ) and NRZI formats. Both formats use two different voltage levels for transmission. NRZ signals maintain constant voltage levels with no signal transitions (no return to a zero voltage level) during a bit interval and are decoded using absolute values (0 and 1). NRZI uses the same constant signal levels but interprets the presence of data at the beginning of a bit interval as a signal transition and the absence of data as no transition. NRZI uses differential encoding to decode signals, rather than determining absolute values.
NRZ format, the factory default on all interfaces, is the most common. NRZI format is commonly used with EIA/TIA-232 connections in IBM environments. To enable NRZI encoding on any interface, specify the port address of the interface followed by the command nrzi-encoding. In the example that follows, serial port 0 is configured for NRZI encoding:
To disable NRZI encoding on a port, specify the port and use the no nrzi-encoding command. Refer to the Cisco IOS configuration guides and command references for complete command descriptions and instructions.
On Cisco 4000 series routers, all serial interfaces support CRC-ITU-T, a 16-bit cyclic redundancy check (CRC). CRC is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data. The sender of a data frame divides the bits in the frame by a predetermined number to calculate a remainder or frame check sequence (FCS). Before it sends the frame, the sender appends the FCS value to the message so that the frame contents are exactly divisible by the predetermined number. The receiver divides the frame contents by the same predetermined number. If the result is not 0, the receiver assumes that a transmission error occurred and sends a request to the sender to resend the frame.
The designator 16 indicates the number of check digits per frame that are used to calculate the FCS. CRC-16, which transmits streams of 8-bit characters, generates a 16-bit FCS. Both the sender and the receiver must use the same setting of 16.
The default for all serial interfaces is for 16-bit CRC.
This section describes how to configure individual interfaces for framed or unframed mode, four-bit CRC, loopback, and for specifying a clock source.
When you have verified that the new G.703/G.704 network processor modules are installed correctly (the enabled LED goes on), use the privileged-level configure command to configure the new interfaces.
Be prepared with the information you will need, such as the following:
The following are the default settings for all E1-G.703/G.704 interfaces; each can be enabled or disabled:
The E1-G.703/G.704 interfaces support both framed (G.704) and unframed (G.703) modes of operation; the default is for unframed operation. To enable framed operation, you must specify the start and stop slots. Following is a sample display of the timeslot command with a start slot of 1 and a stop slot of 13:
Invalid combinations of start and stop slots will be ignored and the interface will be left unchanged.
The system default is not to use time slot 16 for data. To use slot 16 for data, use the timeslot 16 command. To restore the system default, use the no timeslot 16 command.
The E1-G.703/G.704 port operates either with an external clock signal that it recovers from the received data stream (the default clocking) or with its own internal clock signal. To specify the clock source, use the clock source {line | internal} command.
To change the default and use the internal clock, use the clock source internal command.
To return the interface to the default state, use the clock source line command. (You can also negate either of these commands to change a setting; for example, the no clock source internal command also returns the interface to the default state.) All E1-G.703/G.704 interfaces operate at a default clock rate of 2.048 Mbps; the clock rate cannot be configured.
CRC-4 is a 4-bit error checking technique that uses a calculated numeric value to perform an ongoing data integrity check and detect errors in transmitted data. The E1-G.703/G.704 network processor module supports CRC in framed mode only. By default, CRC-4 is not enabled.
To enable CRC-4 on the E1 interface, specify the port address of the interface followed by the command crc4. Press Ctrl-Z after altering the configuration and before exiting the configuration mode. In the example that follows, serial port 3 on an E1-G.703/G.704 network processor module is configured for CRC:
To disable CRC and return to the default of no CRC error checking, specify the port and use the no crc4 command. For complete command descriptions and instructions refer to the Cisco IOS configuration guides and command references.
When you have configured the serial interfaces, use the show interface command to check the network interface statistics. Options to the show interface command include the type of interface (for example, serial), and the unit number of the interface. The following example shows the output of show interface serial 0:
The field underrun in the output of the show interface command may be nonzero in approximately one of 250,000 packets.
To display the current internal status of a network processor module, use the show controller command with the interface type and unit number options. (Note in the following example that universal serial means the four-port serial module.) The following is the output of the show controller serial 2 command:
Note that the cable type is shown as no cable. If a cable is attached to the port, the cable type would be shown, as in the following example:
If the cable is DCE, the output of the show controller command displays the clock rate. For complete command descriptions and instructions, refer to the Cisco IOS configuration guides and command references.
To store the configuration or changes to your startup configuration, enter the command copy running-config startup-config at the enable prompt (#):
Entering this command will save the configuration settings that the setup process created in the router. If you fail to do this, your configuration will be lost the next time you reload the router.
The Cisco IOS software running your router contains extensive features and functionality. The effective use of many of these features is easier if you have more information at hand. We recommend the Cisco Connection Documentation, Enterprise Series CD.
The Cisco CD is updated and shipped monthly, so it might be more current than printed documentation. To order the Cisco Connection Documentation, Enterprise Series CD, contact your local sales representative or call Customer Service. The CD is available both as a single CD and as an annual subscription.You can also access Cisco technical documentation on the World Wide Web URL http://www.cisco.com.
For more information on configuring Cisco 4000 series routers, refer to the Cisco IOS configuration guides and command references.
Copyright 1988-1996 © Cisco Systems Inc.
Would you like to enter the initial dialog? [yes]: no
After a few seconds you will see the user EXEC prompt (Router>). Enter the enable command to enter enable mode. You can only make configuration changes in enable mode:
Router> enable
The prompt will change to the enable prompt, indicated by the "#" sign:
Router#
Enter the command config terminal at the enable prompt to enter configuration mode:
Router# config terminal
You can now enter any changes to the configuration that you want to make. Press Ctrl-Z to exit configuration mode.
Router# show running-config
Router# show config
Router# copy running-config startup-config
********
The results of the show running-config and show startup-config commands will differ if you have made changes to the configuration but have not yet written them to NVRAM.
Configuring the Router Using AutoInstall
Hostname# copy running-config startup-config
Taking this step will save the configuration settings that the AutoInstall process created in the router. If you fail to do this, your configuration will be lost the next time you reload the router.
Configuring the Router Manually Using the Setup Facility
Configuring the Global Parameters
Notice: NVRAM invalid, possibly due to write erase.
--- System Configuration Dialog ---
At any point you may enter a question mark '?' for help.
Refer to the 'Getting Started' Guide for additional help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
Enter yes (the default) or press Return when you are asked if you would like to enter the configuration dialog and if you would like to see the current interface summary.
Would you like to enter the initial configuration dialog? [yes]:
First, would you like to see the current interface summary? [yes]:
Any interface listed with OK? value "NO" does not have a valid configuration
Interface IP-Address OK? Method Status Protocol
Ethernet0 unassigned NO not set up down
Ethernet1 unassigned NO not set down down
Serial0 unassigned NO not set down down
Serial1 unassigned NO not set down down
Serial2 unassigned NO not set down down
Serial3 unassigned NO not set down down
Choose which protocols to support on your first Ethernet interface. For IP-only installations, you can accept the default values for most of the questions. A typical configuration using IP, Internetwork Packet Exchange (IPX), and AppleTalk follows:
Configuring global parameters:
Enter host name [Router]: router
Enter the enable secret password, the enable password, and the virtual terminal password:
The enable secret is a one-way cryptographic secret used
instead of the enable password when it exists.
Enter enable secret : shovel
The enable password is used when there is no enable secret
and when using older software and some boot images.
Enter enable password : trowel
Enter virtual terminal password: pail
Enter yes or no to accept or refuse Simple Network Management Protocol (SNMP) management:
Configure SNMP Network Management? [no]:
SNMP is the most widely supported open standard for network management. It provides a means to access and set configuration and run-time parameters of routers and communication servers. SNMP defines a set of functions that can be used to monitor and control network elements.
Configure IP? [yes]:
Configure IGRP routing? [yes]:
Your IGRP autonomous system number [1]: 15
Respond to the prompts as follows to enable routing on IPX and AppleTalk; IP has already been selected:
Configure IPX? [no]: yes
Configure AppleTalk? [no]: yes
Multizone networks? [no]: yes
Configure LAT? [yes]: no
If your router has an ISDN network processor module installed, you will be prompted to select the switch type for your router. The ISDN switch type appropriate for your router depends on the ISDN provider's equipment. Table 5-1 lists the ISDN switch types.
Enter ISDN BRI Switch Type [none]: basic-ni1
ISDN BRI Switch Types
ISDN Switch Type
Description
basic-1tr6
German 1TR6 ISDN switches
basic-5ess
AT&T basic rate switches
basic-dms100
NT DMS-100 basic rate switches
basic-net3
NET3 ISDN switches (U. K. and others)
basic-ni1
National ISDN-1 switches
basic-nwnet3
Norwegian NET3 ISDN switches (phase 1)
basic-nznet3
New Zealand NET3 ISDN switches
basic-ts013
Australian TS013 switches
none
Switch type not defined
ntt
Japanese NTT ISDN switches
vn2
French VN2 ISDN switches
vn3
French VN3 ISDN switches
Additional Configuration Tasks
Configuring the Ethernet Interface
Configuring interface parameters:
Configuring interface Ethernet0:
Is this interface in use? [yes]:
Configure IP on this interface? [yes]:
IP address for this interface: 172.16.72.1
Number of bits in subnet field [0]: 8
Class B network is 172.16.0.0, 8 subnet bits; mask is 255.255.255.0
Enter yes if you will be using AppleTalk on the interface, enter yes to configure for extended AppleTalk networks, and then enter the cable range number, the zone name, and any other additional zones that will be associated with your local zone:
Configure AppleTalk on this interface? [no]: yes
Extended AppleTalk network? [no]: yes
AppleTalk starting cable range [0]: 1
AppleTalk ending cable range [1]: 2
AppleTalk zone name [myzone]:
AppleTalk additional zone name: otherzone
AppleTalk additional zone name:
If you are going to enable IPX on this interface, enter the unique IPX network number:
Configure IPX on this interface? [no]: yes
IPX network number [1]: B001
Configure XNS on this interface? [no]
Repeat Step 1 through Step 3 to configure each Ethernet interface in your router.
media-type aui
media-type 10baset
router> ena
Password:
router# configure terminal
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
interface ethernet 0
media-type aui
^z
router# write memory
Configuring the T1 Interface
Router# conf t
Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Router(config)# cont t1 1
Specify the clock source for the module. The clock source command determines which end of the circuit provides the clocking:
Router(config-controller)# clock source line
Router(config-controller)# framing esf
Specify the line code format:
Router(config-controller)# linecode b8zs
Router(config-controller)#
%CONTROLLER-3-UPDOWN: Controller T1 1, changed state to up Router(config-controller)#
Router(config-controller)# channel-group 0 timeslots 1,3-5,7
Router(config-controller)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to up Router(config-controller)#
Router(config-controller)#
Specify the serial interface, unit number, and channel group you want to modify:
Router(config-controller)# int serial 1:0
Assign an IP address and subnet mask to the interface using the ip address command as follows, substituting the appropriate IP address and subnet mask for your site:
Router(config-if)# ip address 10.1.15.1 255.255.255.0
Router(config-if)#
Add any additional configuration commands required to enable routing protocols and adjust the interface characteristics. Refer to the Cisco IOS configuration guides and command references for more information on configuration subcommands.
Router# write memory
The system displays a confirmation message when the configuration is saved.
Router# disable
Router>
Enter the show commands to check the configuration of the interface.
Configuring the E1 Interface
Router# conf t
Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Router(config)# cont e1 1
Router(config-controller)# framing crc4
Specify the channel group and time slots to be mapped. The command shown below sets the channel group to 0 and time slots 1, 3 through 5, and 7 are selected for mapping:
Router(config-controller)# channel-group 0 timeslots 1,3-5,7
Router(config-controller)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1:0, changed state to up Router(config-controller)#
Router(config-controller)#
Specify the serial interface, unit number, and channel group you want to modify:
Router(config-controller)# int serial 1:0
Assign an IP address and subnet mask to the interface using the ip address command as follows, substituting the appropriate IP address and subnet mask for your site:
Router(config-if)# ip address 10.1.15.1 255.255.255.0
Router(config-if)#
Add any additional configuration subcommands required to enable routing protocols and adjust the interface characteristics. Refer to the Cisco IOS configuration guides and command references for more information on configuration subcommands.
Router# write memory
The system displays a confirmation message when the configuration is saved.
Router# disable
Router>
Configuring the ISDN BRI Interface1
Configuring interface BRI0:
Is this interface in use? [yes]:
Configure IP on this interface? [yes]:
IP address for this interface: 172.16.21.15
Number of bits in subnet field [0]:
Class B network is 172.16.0.0, 8subnet bits; mask is 255.255.255.0
Repeat Step 1 for each BRI interface installed in your router.
Configuring the ATM Network Processor Module Interface
Router#
conf t
Router(config)#
int atm 0
Router(config-if)#
atm sonet stm-1
Router(config-if)#
atm framing g832adm
Router(config-if)#
atm framing m23adm
Router(config-if)#
ip address 10.1.15.1 255.255.255.0
Router(config-if)#
atm pvc 1 1 32 aal5snap
Router(config-if)#
atm pvc 2 1 33 aal5snap
Router(config-if)#
map-group list1
Enable the interface:
Router(config-if)# no shut
Router(config-if)#
map-list list1
Router(config-map-list)#
ip 1.1.1.2 atm-vc 1 broadcast
Router(config-map-list)#
ip 1.1.1.3 atm-vc 2 broadcast
Press Ctrl-Z to complete the configuration.
Router#
write memory
Router#
disable
The following example shows a basic configuration using switched virtual circuits (SVCs). Press Return after each step.
Router#
conf t
Specify the unit to configure by entering the command int atm and the unit number of the network processor module you are configuring. For more information on unit numbers, refer to the section "Unit Numbering" in the chapter "Making External Connections to the Cisco 4000 Series." The following example is for an ATM module with unit number 0:
Router(config)#
int atm 0
Specify the framing type.
Router(config-if)#
atm sonet stm-1
Router(config-if)#
atm framing g832adm
Router(config-if)#
atm framing m23adm
Router(config-if)#
ip address 10.1.15.1 255.255.255.0
Create the signaling PVC, which is required by the signaling software to communicate with a switch in order to dynamically set up SVCs. In the following example, signaling virtual channel 1 uses VPI 0 and VCI 5:
Router(config-if)#
atm pvc 1 0 5 qsaal
Configure the ATM network service access point (NSAP) address:
Router(config-if)#
atm nsap-address nsap-addr
where nsap-addr could be:
AB.CDEF.01.234567.890A.BCDE.F012.3456.7890.1234.12
Assign the appropriate map list to the interface:
Router(config-if)#
map-group list2
Enable the interface:
Router(config-if)#
no shut
Create the mapping of protocol addresses to ATM NSAP addresses, as follows:
Router(config-if)#
map-list list2
Router(config-map-list)#
ip 10.1.15.1 nsap-addr nsap-addr broadcast
Router(config-map-list)#
ip 10.1.15.1 nsap-addr nsap-addr broadcast
Press Ctrl-Z to complete the configuration.
Router#
write memory
Exit the privileged level and return to the user level:
Router#
disable
Configuring the Synchronous Serial Interfaces
Configure IP unnumbered on this interface? [no]: no
IP address for this interface: 172.16.73.1
Number of bits in subnet field [8]:
Class B network is 172.16.0.0, 8 subnet bits; mask is 255.255.255.0
Configure AppleTalk on this interface? [no]: yes
Extended AppleTalk network? [yes]:
AppleTalk starting cable range [2]: 3
AppleTalk ending cable range [3]: 3
AppleTalk zone name [myzone]: ZZ Serial
AppleTalk additional zone name:
Configure IPX on this interface? [no]: yes
IPX network number [2]: B000
Repeat Step 1 for the remaining serial interfaces.
Configuring Timing (Clock) Signals for Serial Interfaces
Setting the Clock Rate on Serial Interfaces
interface serial 1
clockrate 72000
12002400480096001920038400560006400072000
1250001480005000008000001000000130000020000004000000
Inverting the Clock Signal on Serial Interfaces
interface serial 0
dce-terminal-timing-enable
Configuring NRZI Format on Serial Interfaces
router# configure terminal
interface serial 0
nrzi-encoding
^Z
Calculating CRCs on Cisco 4000 Series Serial Interfaces
Configuring G.703/G.704 Interfaces
Configuring Framed and Unframed Mode for E1-G.703/G.704 Interfaces
router# timeslot 1-13
Configuring Timing (Clock) Signals for E1-G.703/G.704 Interfaces
Configuring CRC-4 for E1-G.703/G.704 Interfaces
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router (config)# interface serial 3
(config-if)# crc4
(config-if)# ^Z
Checking the Router Configuration
router> show interface serial 0
Serial 0 is up, line protocol is up
Hardware is HD64570
Internet address is 193.195.74.236, subnet mask is 255.255.255.248
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive not set
Last input 0:00:01, output 0:00:10, output hang never
Last clearing of "show interface" counters never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets/sec
Five minute output rate 0 bits/sec, 0 packets/sec
2922 packets input, 5844 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
145 packets output, 185562 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets, 0 restarts
880 carrier transitions
router# show controller s 2
HD unit 2, idb 0x246AAC, ds 0x248240
buffer size 2108 Universal Serial: No cable
DCD=0 DSR=0 DTR=0 RTS=0 CTS=0
cpb = 0x4, eda = 0xDA18, cda = 0xD798
RX ring with 32 entries at 0x604D798
00 bd_ptr=0xD798 pak=0x604E728 ds=0x604E87C status=80 pak_size=0
01 bd_ptr=0xD7AC pak=0x604EEAC ds=0x604F000 status=80 pak_size=0
02 bd_ptr=0xD7C0 pak=0x604F630 ds=0x604F784 status=80 pak_size=0
(some screen output deleted)
32 bd_ptr=0xDA18 pak=0x605D7A8 ds=0x605D8FC status=80 pak_size=0
cpb = 0x4, eda = 0xE1E0, cda = 0xE1E0
TX ring with 8 entries at 0x604E1E0
00 bd_ptr=0xE1E0 pak=0x000000 ds=0x000000 status=80 pak_size=0
01 bd_ptr=0xE1F4 pak=0x000000 ds=0x000000 status=80 pak_size=0
02 bd_ptr=0xE208 pak=0x000000 ds=0x000000 status=80 pak_size=0
03 bd_ptr=0xE21C pak=0x000000 ds=0x000000 status=80 pak_size=0
04 bd_ptr=0xE230 pak=0x000000 ds=0x000000 status=80 pak_size=0
05 bd_ptr=0xE244 pak=0x000000 ds=0x000000 status=80 pak_size=0
06 bd_ptr=0xE258 pak=0x000000 ds=0x000000 status=80 pak_size=0
07 bd_ptr=0xE26C pak=0x000000 ds=0x000000 status=80 pak_size=0
08 bd_ptr=0xE280 pak=0x000000 ds=0x000000 status=80 pak_size=0
0 missed datagrams, 0 overruns, 0 bad frame addresses
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
buffer size 2108 Universal Serial: DTE V.24 (RS-232) cable
Saving the Router Configuration
Hostname# copy running-config startup-config
If You Need More Information
