Configuring Serial Interfaces - NM-16A/S [Support]

Table Of Contents

NM-16A/S

Contents

Prerequisites for NM-16A/S

Restrictions for NM-16A/S

Information About NM-16A/S

Synchronous and Asynchronous Mode Configurations

Platform Support for the NM-16A/S Feature

How to Configure the NM-16A/S

Configuring the Slow-Speed Interfaces for NM-16A/S

Configuring the ignore Command for NM-16A/S

What to Do Next

Configuration Examples for NM-16A/S

show running-config Example

Additional References

Related Documents

MIBs

RFCs

Technical Assistance

Command Reference

Glossary

NM-16A/S

The NM-16A/S is a slow-speed, high-density serial network module (NM) offering asynchronous and synchronous interfaces and flexible port configuration. The NM-16A/S offers:

•Synchronous interfaces that support a data rate of up to 128 kbps

•Asynchronous interfaces that support a data rate of up to 115.2 kbps

•Configurable data terminal equipment (DTE) and data circuit-terminating equipment (DCE)

Feature History for NM-16A/S

Release

Modification

12.2(15)ZJ

This feature was introduced.

12.3(2)T

This feature was integrated into Cisco IOS Release 12.3(2)T.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

Contents

•Prerequisites for NM-16A/S

•Restrictions for NM-16A/S

•Information About NM-16A/S

•How to Configure the NM-16A/S

•Configuration Examples for NM-16A/S

•Additional References

•Command Reference

•Glossary

Prerequisites for NM-16A/S

This feature requires Cisco IOS Release 12.2(15)ZJ or Release 12.3(2)T or a later release.

Restrictions for NM-16A/S

The NM-16A/S is factory configurable and not field upgradable.

Information About NM-16A/S

To configure the NM-16A/S feature, you must understand the following concept.

•Synchronous and Asynchronous Mode Configurations

•Platform Support for the NM-16A/S Feature

Synchronous and Asynchronous Mode Configurations

The synchronous ports are addressed as interface serial slot/port. The asynchronous port, when configured, utilizes the tty line numbering scheme, which is linear and allows for 32 tty ports per network module slot. Table 1 shows the port number corresponding to tty line number.

Table 1 Port Numbering Scheme

Slot Number

tty Terminal Line Number

Telnet TCP Port Number

Raw TCP Port Number

Binary TCP Port Number

0

1-32

2001-2032

4001-4032

6001-6032

1

33-64

2033-2064

4033-4064

6033-6064

2

65-96

2065-2096

4065-4096

6065-6096

3

97-128

2097-2128

4097-4128

6097-6128

4

129-160

2129-2160

4129-4160

6129-6160

5

161-192

2161-2192

4161-4192

6161-6192

6

193-224

2193-2224

4193-4224

6193-6224

Platform Support for the NM-16A/S Feature

This feature is supported on Cisco 2610XM, Cisco 2611XM, Cisco 2620XM, Cisco 2621XM, Cisco 2650XM, Cisco 2651XM, Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745 routers.

This feature is not supported on the non-XM models of the Cisco 2610, Cisco 2611, Cisco 2620, Cisco 2621, Cisco 2650, Cisco 2651. This feature is not supported on the Cisco 3620, Cisco 3640, and Cisco 3640/A routers.

How to Configure the NM-16A/S

This section contains the following procedures:

•Configuring the Slow-Speed Interfaces for NM-16A/S

•Configuring the ignore Command for NM-16A/S

Configuring the Slow-Speed Interfaces for NM-16A/S

To specify the mode of a slow-speed serial interface on a router as either synchronous or asynchronous, use the following commands:

SUMMARY COMMANDS

1. enable

2. configure terminal

3. interface serial slot/port

4. physical-layer {sync | async}

5. clock rate {speed | line rate}

6. speed bps

7. ip address ip-address mask [secondary]

8. encapsulation encapsulation-type

9. load-interval seconds

10. exit

DETAILED COMMANDS

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface serial slot/port
Example:

Router(config)# interface serial 1/1

Enters interface configuration mode and specifies the serial interface created on the controller.

•slot/port—Backplane slot number and port number on the controller. The slash mark is required.

Step 4

physical-layer {sync | async}
Example:

Router (config-if)# physical-layer async

Specifies the mode of a slow-speed serial interface.

•sync—Places the interface in synchronous mode. This is the default.

•async—Places the interface in asynchronous mode.

Step 5

clock rate {speed | line rate}
Example:

Router (config-if)# clock rate 128000

Configures the clock rate for serial interfaces and interface processors to an acceptable bit rate.

•speed—Desired clock rate in bits per second: 300, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 32000, 38400, 56000, 57600, 64000, 72000, 125000, or 128000.

•Using the line keyword specifies the line clock.

•The rate argument specifies the rate when the line keyword is used.

•Must be configured on the DCE interface if the mode is synchronous.

•To remove the clock rate if you change the interface from a DCE to a DTE device, use the no form of this command.

•Using the no form of this command on a DCE interface sets the clock rate to the hardware-dependent default value.

Step 6

speed bps
Example:

Router (config-if)# speed 115200

(Optional) Configures the speed for an interface.

•This is only for asynchronous mode; default is 9600 bps.

•Configured only if a different speed is required.

•Both interfaces at each end of the cable must be configured for the same speed.

•To disable a speed setting, use the no form of this command.

Step 7

ip address ip-address mask [secondary]
Example:

Router (config-if)# ip address 192.168.220.220 255.255.0.0 secondary

Sets a primary or secondary IP address for an interface.

•ip-address—IP address for the interface.

•mask—Mask for the associated IP subnet.

•secondary—(Optional) Specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address.

Step 8

encapsulation encapsulation-type
Example:

Router(config-if)# encapsulation ppp

Sets the encapsulation method used by the interface.

•encapsulation-type—Encapsulation type; one of the following keywords:

–atm-dxi—ATM Mode-Data Exchange Interface.

–bstun—Block Serial Tunnelling.

–frame-relay—Frame Relay (for serial interface).

–hdlc—High-Level Data Link Control (HDLC) protocol for serial interface. This encapsulation method provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. This is the default for synchronous serial interfaces.

–isl—Inter-Switch Link (ISL) (for virtual LANs).

–lapb—X.25 Link Access Procedure, Balanced. Data link layer protocol (LAPB) DTE operation (for serial interface).

–ppp—PPP (for serial interface).

–sdlc—IBM serial Systems Network Architecture (SNA).

–sdlc-primary—IBM serial SNA (for primary serial interface).

–sdlc-secondary—IBM serial SNA (for secondary serial interface).

–slip—Specifies Serial Line Internet Protocol (SLIP) encapsulation for an interface configured for dedicated asynchronous mode or dial-on-demand routing (DDR). This is the default for asynchronous interfaces.

–smds—Switched Multimegabit Data Services (SMDS) (for serial interface).

Note For more extensive information about the options for encapsulation-type, refer to the Cisco IOS Release 12.3 T Cisco IOS command references master index for the encapsulation command. This information is available on cisco.com.

Step 9

load-interval seconds
Example:

Router(config-if)# load-interval 90

Changes the length of time for which data is used to compute load statistics.

•seconds—Length of time for which data is used to compute load statistics. A value that is a multiple of 30, from 30 to 600 (30, 60, 90, 120, and so on).

Step 10

exit
Example:

Router(config-if)# exit

Exits interface configuration mode.

Configuring the ignore Command for NM-16A/S

Perform this task to configure the serial interface to ignore the specified signals as the line up/down indicator:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface serial slot/port

4. ignore [dtr | rts]
or
ignore [dtr | local-loopback | rts]
or
ignore [cts | dsr]
or
ignore [cts | dcd | dsr]

5. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface serial slot/port
Example:

Router(config)# interface serial 1/1

Specifies the serial interface created on the controller.

•slot/port—Backplane slot number and port number on the controller. The slash mark is required.
Step 4
ignore [dtr | rts]
or
ignore [dtr | local-loopback | rts]
or
ignore [cts | dsr]
or

ignore [cts | dcd | dsr]
Example:

Router(config-if)# ignore dtr
For DCE asynchronous mode.

or

For DCE synchronous mode.

or

For DTE asynchronous mode.

or

For DTE synchronous mode.

Note This command is disabled by default. The no ignore command restores the default.

Specifies the serial signal to be ignored.

•dtr—Specifies that the DCE ignores the data terminal ready (dtr) signal.

•rts—Specifies that the DCE ignores the request to send (rts) signal.

•local-loopback—Specifies that the DCE ignores the local loopback signal.

•cts—Specifies that the DTE ignores the clear to send (cts) signal.

•dsr—Specifies that the DTE ignores the data set ready (dsr) signal.

•dcd—Specifies that the DTE ignores the data carrier detect (dcd) signal.
Step 5

exit
Example:

Router(config-if)# exit

Exits interface configuration mode.
What to Do Next

To verify that the slow-speed serial interface is configured correctly, enter the show interfaces serial privileged EXEC command to display the command settings for the router.

To enable the transition of the serial control leads to be reported on the console, use the debug serial lead-transition command in privileged EXEC mode.

Caution To avoid having the debug message flood the console screen with debug information, use these commands only when traffic on the IP network is low, so other activity on the system is not adversely affected.

The following is sample output from the debug serial lead-transition command:
Router# debug serial lead-transition 
Router# debug condition interface serial 1/1
*Mar  1 00:17:15.040:slot(1) Port(1):DSR/DTR is Deasserted
*Mar  1 00:17:15.040:slot(1) Port(1):CTS/RTS is Deasserted
*Mar  1 00:17:47.955:slot(1) Port(1):DCD/Local Loop is Deasserted
*Mar  1 00:17:47.955:slot(1) Port(1):DSR/DTR is Deasserted
*Mar  1 00:17:47.955:slot(1) Port(1):CTS/RTS is Deasserted
Router# no shut down serial 1/1
*Mar  1 00:16:52.298:slot(1) Port(1):DSR/DTR is Asserted
*Mar  1 00:16:52.298:slot(1) Port(1):CTS/RTS is Asserted
*Mar  1 00:16:31.648:slot(1) Port(1):DCD/Local Loop is Asserted
*Mar  1 00:16:31.648:slot(1) Port(1):DSR/DTR is Asserted
*Mar  1 00:16:31.648:slot(1) Port(1):CTS/RTS is Asserted
Configuration Examples for NM-16A/S

The following is sample output from the show running-config command:

•show running-config Example

show running-config Example
interface Serial1/0
 ip address 10.1.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/1
 ip address 10.2.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/2
 ip address 10.3.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/3
 ip address 10.4.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/4
 ip address 10.5.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/5
 ip address 10.6.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/6
 ip address 10.7.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/7
 ip address 10.8.0.2 255.255.255.0
 load-interval 30
 no keepalive
 clockrate 128000
 fair-queue
 no cdp enable
!
interface Serial1/8
 physical-layer async
 ip address 10.9.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/9
 physical-layer async
 ip address 10.10.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/10
 physical-layer async
 ip address 10.11.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/11
 physical-layer async
 ip address 10.12.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/12
 physical-layer async
 ip address 10.13.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/13
 physical-layer async
 ip address 10.14.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/14
 physical-layer async
 ip address 10.15.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
 fair-queue 64 16 0
!
interface Serial1/15
 physical-layer async
 ip address 10.16.0.2 255.255.255.0
 encapsulation ppp
 load-interval 60
 async mode dedicated
!
end
Additional References

The following sections provide references related to NM-16A/S.

Related Documents

Related Topic

Document Title

Basic information for configuration

Cisco IOS Configuration Fundamentals and Network Management Configuration Guide, Release 12.3

Cisco IOS voice commands

Cisco IOS Voice Command Reference, Release 12.3 T

Configuration guidelines and detailed command reference information for voice, video, and fax

Cisco IOS Voice Configuration Library

Hardware installation instructions for network modules

Connecting Serial Network Modules

MIBs

MIBs

MIBs Link

•CISCO-ENTITY-VENDORTYPE-OID-MIB.my

•OLD-CISCO-CHASSIS-MIB.my

•ENTITY-MIB.my

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFCs

Title

RFC 2515

Definitions of Managed Objects for ATM Management. K. Tesink, Ed.

Technical Assistance

Description

Link

Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and lots more. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/public/support/tac/home.shtml

Command Reference

The following modified commands are pertinent to this feature. To see the command pages for these commands and other commands used with this feature, go to the Cisco IOS Master Commands List, Release 12.4, at http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/
124index.htm.

•clock rate

•debug serial lead-transition

•ignore (interface)

Glossary

ATM—asynchronous transfer mode.

cts—clear to send. Circuit in the EIA/TIA-232 specification that is activated when DCE is ready to accept data from a DTE.

DCE—data circuit-terminating equipment (ITU-T expansion). Devices and connections of a communications network that comprise the network end of the user-to-network interface. The DCE provides a physical connection to the network, forwards traffic, and provides a clocking signal used to synchronize data transmission between DCE and DTE devices. Modems and interface cards are examples of DCE. Compare with DTE.

dcd—data carrier detect. DCD is a signal from the DCE device that typically means that the DCE is ready to accept data. If the DCE device is a modem, the DCD signal traditionally refers to the modem having received a modulation carrier signal and is now able to pass data.

DDR—dial-on-demand routing.

dsr—data set ready. EIA/TIA-232 interface circuit that is activated when DCE is powered up and ready for use.

DTE—data terminal equipment. Device at the user end of a user-to-network interface that serves as a data source, destination, or both. DTE connects to a data network through a DCE device (for example, a modem) and typically uses clocking signals generated by the DCE. DTE includes such devices as computers, protocol translators, and multiplexers. Compare with DCE.

dtr—data terminal ready. EIA/TIA-232 circuit that is activated to let the DCE know when the DTE is ready to send and receive data.

HDLC—High-Level Data Link Control.

ISL—Inter-Switch Link.

LAPB—Link Access Procedure, Balanced.

NIM—network interface module.

PPP—Point-to-Point Protocol.

rts—request to send. EIA/TIA-232 control signal that requests a data transmission on a communications line.

SLIP—Serial Line Internet Protocol.

SMDS—Switched Multimegabit Data Services.

VIP—Versatile Interface Processor.

Note Refer to the Internetworking Terms and Acronyms for terms not included in this glossary.

Copyright © 2003 Cisco Systems, Inc. All rights reserved.