Cisco Systems OC-12-STM-14 User Manual

Cisco IOS Software Configuration for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

This document describes the software conf iguratio n procedure for the 1-por t channelized OC-12/STM-4 (DS3) line card on the Cisco 12000 Series Router. This line card is sometimes referred to as the Channelized OC-12 to DS3 line card or the OC 12-DS3 line c ard.

Feature History for the 1-Port Channelized OC-12/STM-4 (DS3)

Release Modification

11.2(19)GS4 This feature was introduced.

12.0(8)S This feature was introduced on the 12.0 S train.

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 o r passwo rd, click Cancel at the login dialog box and follow the instructions that appear.

• Prerequisites for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card, page 2

• Information About the 1-Port Channelized OC-12/STM-4 (DS3) Line Card, page 2

• How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card, page 2

• Configuration Examples for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card, page 17

• Additional References, page 19

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Cisco IOS Software Configuration for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Prerequisites for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

The Cisco 12000 Series Router must have at least one clock and scheduler card (CSC) installed that provides a one-quarter bandwidth to support the req uirements of the 1-p ort chan nelized OC-12/ST M-4 (DS3) line card.

Information About the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

The 1-port channelized OC-12/STM- 4 (DS3) line card provides 12 channels of DS3 multiplexed over a single 622-Mbps OC-12 port. The 1-port channelized OC-12/STM-4 (DS3) line card interfaces through an Add Drop Multiplexer (ADM) with other DS3 line cards at DS3 line rates in a configuration that usually consists of a Cisco 7200 Series Ro uter and a Cisco 7500 Series Router configured with the packet-over-E3/T3 (POET) port adapter , or a third-party T3 data service unit (DSU) such as Digital Link, Larscom, or Kentrox.

The 1-port channelized OC-12/STM-4 (DS3) line card interfaces with the Cisco 12000 Series Router switch fabric and provides one OC-12 duplex SC single-mode intermediate -reach Synchronous Optical Network (SONET) connection.

How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

The following sections provide information for configuring and verifying the configuration.

• Configuring the OC-12 Controller, page 2

• Configuring the DS3 Serial Interface, page 4

• Cisco Remote Connection Management, page 5

• Using show Commands to Check System Status, page 8

• Using Loopback Command s, page 12

• Configuring DS3 Port BER Testing, page 13

Configuring the OC-12 Controller

Use the configure command to configure the new OC-12 controller. A Cisco 12000 Series Router identifies a controller by slot/port. The current OC-12 controller-configurable parameter settings are displayed as part of the show controller oc12 number/0 command, as in the following example:

Router# show controller oc12 1/0 OC12_CH_DS31/0 The current state of the controller is up Current configurable parameter settings: Clock source is LINE, Payload scrambling is ON Loopback is NONE Router#

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(Remainder of displayed text omitted from example)

Table 1 shows the default OC-12 controller configuration of a 1-port channelized OC-12/STM-4 (DS3)

line card in a Cisco 12000 Series Router. In controller configuration mode, select an OC-12 controller for configuration using the controller oc12 slot/port command.

Table 1 1-Port Channelized OC-12/STM-4 (DS3) Line Card Controller Configuration Default Values

Parameter Configuration Command Default Value

Clock source [no] clock source [internal | line] line Loop internal [no] loopback [internal | line] no loopback Shutdown [no] shutdown no shutdown

The following steps make up a basic controller configuration for the 1-port channelized OC-12/STM-4 (DS3) line card on a router.

Step 1 Enter global configuration mode by entering configure terminal at the privileged EXEC prompt:

Router# configure terminal Router(config)#

Step 2 Enter controller configuration mode by entering the controller OC-12 slot/port global configuration

command and specify the router slot number and port number:

Router(config)# controller OC12 1/0 Router(config-controller)#

Step 3 Set the clock source by entering the clock source cont roller co nfiguration command and specify line or

internal:

Router(config-controller)# [no] clock source {line | internal}

Use the no form of this command to restore the defaul t value, line.

Step 4 To change the OC-12 controller payload scrambling:

Router(config-controller)# [no] scramble

Use the no form of this command to remove scrambling. The default value is scrambling.

Step 5 To change the OC-12 controller loopback mode:

Router(config-controller)# [no] loopback {line | internal}

Use the no form of this command to remove the loop.

Step 6 To change the shutdown state to up and enable the controller, enter the no shutdown controller

configuration command:

Router(config-controller)# [no] shutdown

The no shutdown command passes an enable command to th e 1-port chann elized OC-12/STM-4 (DS3) line card. It also causes the line card to configure itsel f based on the pr evious configuratio n comm and s sent.

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How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Configuring the DS3 Serial Interface

After you verify the OC-12 contr oller configuration, you can conf igure the associated DS3 channel and serial interfaces on the OC-12 controller. Be prepared with the information you will need, such as the interface IP address.

The following sections describe how to enable an interface and specify IP routing. You may also need to enter other configuration commands, depending on your system configuration requirements. For descriptions of configuration commands and the conf iguration options a v ailable, refer to th e appropriate software publications listed in the “Related Documents” section on page 19.

A Cisco 12000 Series Router identifies an interface on the 1-port channelized OC-12/STM-4 (DS3) line card by its chassis slot number, line card port number, and DS3 channel number, in the format slot/port:channel. For example, the slot/port:channel# address of the first DS3 serial interface on a 1-port channelized OC-12/STM-4 (DS3) line card installed in line card slot 1 is 1/0:1. The port number is 0.

Table 2 shows the default DS3 serial interface configuration of an enabled line card. At the prompt,

specify the new interface to configure by entering the interface command, followed by the type (serial) and slot/port:channel#.

Table 2 1-Port Channelized OC-12/STM-4 (DS3) Line Card Configuration Default Values

Parameter Configuration Command Default Value

Cyclic Redundancy Check crc [16 | 32] 16 Encapsulation encapsulation [hdlc | ppp] hdlc Framing framing {c-bit | m13} c-bit Idle character mode [no] idle-character [flags | marks] flags Invert data [no] invert data no invert data Keepalive [no] keepalive keepalive Maximum transmission unit (mtu) [no] mtu bytes 4470 bytes Transmitter delay [no] transmitter-delay # of idle

characters

Use the following procedures to configure the 1-port channelized OC-12/STM-4 (DS3) line card:

Step 1 Enter privileged EXEC mode by entering the enable command. The system will prompt you for a

password if one is set.

Router> enable Router#

Press the Return key after each configuration step, unless otherwise noted.

Step 2 Enter global configuration mode by entering the configure terminal command:

Router# configure terminal Router(config)#

Step 3 At the global configuration mode prompt, specify the new interface to configure by entering the

interface command, followed by the type (serial) and slot/port:channel# (line card slot number/port number:channel number).

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The prompt changes to interface conf iguration mode. The follo wing e xample is for a 1-port channelized OC-12/STM-4 (DS3) line card in chassis slot 1:

Router(config)# interface serial 1/0:1

Router(config-if)#

Step 4 Specify framing by selecting the framing c-bit serial interface configuration command:

Router(config-if)# framing c-bit

Step 5 Enable payload scrambling by selecting the scramble serial interface configuration command:

Router(config-if)# scramble

Step 6 Assign an IP address and subnet mask to the interface with the ip address configuration command, as

in the following example:

Router(config-if)# ip address 10.1.2.3 255.0.0.0

Step 7 Turn off keepalive messages:

Router(config-if)# no keepalive

Although some encapsulations benefit from keepalive processing (for example, HDLS), Cisco 12000 Series Routers do not require keepalive messages.

Step 8 Change the shutdown state to up and enable the interface:

Router(config-if)# no shutdown

Step 9 Add any other configuration commands required to enable routing protocols and adjust the interface

characteristics.

Step 10 When you have included all the configuration commands to complete the configuration, type end or

enter ^Z (hold down the Control key while you press Z) to exit configuration mode.

Step 11 Write the new configuration to memory:

Router# copy running-config startup-config Router#

The system displays an OK message when the configuration has been stored. After you have completed your configuration, you can check it using

explanation of show commands, see the “Using show Commands to Check System Status” section on

page 8.

Cisco Remote Connection Management

The 1-port channelized OC-12/STM-4 (DS3) line card consists of high-density DS3 service th rou gh 12 channels that provide DS3 interfaces through fiber-optic connectors for the Cisco 12000 Series Router. There are two sides to the network, a local (near-end) side and a remote (far-end) side. The 1-port channelized OC-12/STM-4 (DS3) line card supports three third-party DSU vendors (Digital-Link, Kentrox, and Larscom) and Internet Service Provider (ISP)-provided DS3 lines to enable connections between a router and another device.

show commands. For an

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How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

You can connect the local (near-end) DS3 port to the remote (far -end) DS3 port usi ng a third-party DSU. Then use the telnet command from the local DS3 port to communicate with the remote DS3 port to verify the DSU mode settings. If necessary, change the DSU mode settings on the local DS3 port to match the DSU mode settings on the remote DS3 port. When the local and remote DS3 ports are configured with matching DSU mode settings, you can start passing data traffic between the near end and the far end of the network.

If the telnet command does not allow the local DS3 port to communicate with the remote DS3 port, it indicates that the DSU mode settings on the local and remote DS3 ports do not match. You can establish direct communication by removing the third-party DSU between the local and remote DS3 ports, and using the default DSU mode, Cisco. When you establish a direct connection between the local and remote DS3 ports, you can use Cisco IOS software commands that are specific to the Cisco Remote Connection Management feature to verify the DSU mode settings on the remote DS3 port. (See Table 1.) After the local and remote DS3 configuration settings match and you verify network connectivity, you can reinsert a third-party DSU into the configuration.

The Cisco Remote Connection Management feature is Cisco proprietary. It works only with the channelized 1-port channelized OC-12/STM-4 (DS3) line card and the 6-port or 12-port DS3 line cards in the Cisco 12000 Series Router.

Table 3 shows the default DS3 channel configuration of an enabled 1-port channelized OC-12/STM-4

(DS3) line card. In serial interface channel configuration mode, select an OC-12 controller for configuration using the interface serial slot/port:channel command.

Table 3 1-Port Channelized OC-12/STM-4 (DS3) Line Card DS3 Channel Configuration Default

Values

Parameter Configuration Command Default Value

DS3 channel, framing mode [no] framing [c-bit | m13]c-bit DS3 channel, DSU mode [no] dsu mode

cisco

[cisco | digital-link | kentrox | larscom]

DS3 channel, DSU subrate

[no] dsu bandwidth Kilobits/sec 44210

bandwidth DS3 channel, remote requests [no] dsu remote accept accept DS3 channel, far-end DSU

[no] dsu remote fullrate user-configured value

bandwidth DS3 channel, payload

[no] scramble no scramble

scrambling DS3 channel, loopback mode [no] loopback

no loopback

[local | network | remote]

DS3 channel, BER testing [no] bert pattern

no bert

[2^15 | 2^20 | 2^23 | 0s | 1s ] interval [1-1440]

Note You can use Cisco Re mote Conn ection Man agement only if (1) both ends of the DS3 line

are configured for C-bit parity mode, and (2) the FEAC message from the DS3 payload source terminal to the DS3 payload sink termin al is delivered unaltered.

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How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

The Cisco Remote Connection Management feature uses two Cisco-proprietary DS3 C-bit parity Far-End Alarm and Control (FEAC) messages that are not used in the American National Standards Institute (ANSI) standard. Table 4 explains the commands that generate the FEAC messages.

Table 4 Far-End Alarm and Control Messages

Confirmation Message FEAC Code Default Value Commands

DEFAULT_SUBRATE_CONFIG 0x0CFF fullrate Router (config-if)# dsu remote fullrate REMOVE_DEFAULT_SUBRATE_CONFIG 0x08FF user-configured Router (config-if)# dsu remote fullrate

Note The local port and the remote port must have matching configurations.

The following sections explain how to use Cisco IOS commands for Cisco Remote Connection Management. Table 3 lists the command parameters.

Verifying Local and Remote DS3 Port Settings

You c an use te lne t to determine the DSU mode settings on the remote DS3 port. Once you verify the remote DS3 port settings, you can change the local confi guration parameters so t hat DSU mode sett ings are the same on both the local and remote DS3 ports. Y o u can set the DSU bandwid th to accept or reject the incoming remote requests from the local DS3 port by entering the dsu remote accept interface configuration command.

Selecting a DSU Mode

The DSU mode supports three third-party DSU vendors—Digital -Link, Kent rox, and Larscom—and the default DSU mode, Cisco. If you use a DSU to make the connection between the Cisco 12000 Series Router and another device, the local DS3 port configuration must match the remote DS3 port configuration. Therefore, if the remote DS3 port uses the Kentrox vendor, a request is sent to the local DS3 port to change the DSU mode to Kentrox, by manually entering the dsu mode configuration command and specifying the Kentrox DSU. If you make a direct connection between a Cisco 1 2000 Series Router and another device, you can use the default DSU mode, Cisco. See Figure 2 for configuration examples.

Setting the Sending and Receiving Rate

The local and remote DS3 ports must also agree on whether to use a subrate or fullrate sending and receiving rate, because the speed of t he sendi ng and receiving rate is regulated by the DSU mode. If the sending and receiving rates do not match, they will not work. Subrates are specific to DSU modes and must be configured appropriately. The subrate sending and receiving rate is slower and less expensive than the faster, more expensive, fullrate. You can synchronize the local and remote DS3 ports sending and receiving rates by entering the dsu remote interface configuration command.

Configuring the DSU Bandwidth Range

The DSU bandwidth range is from 0 to 44210 kbps. The local port and the remote port must have matching configurations. Therefore, if y ou reduce the ef fect i ve bandwid th to 3000 on the l ocal port, you must do the same on the remote port by entering the dsu bandwidth interface configuration command.

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Enabling Payload Scrambling

Payload (data) scrambling converts the data received by the local or remote DS3 ports from any of the three supported third-party DSU vendor modes (Digital-Link, Kentrox, and Larscom) as well as the default, Cisco mode. To enable payload scrambling on the local and remote DS3 ports, you must enter the scramble interface configuration command. If you do not enter the scramble command, payload scrambling remains disabled by default on the local and remote DS3 ports.

Configuring Cyclic Redundancy Checks

The 1-port channelized OC-12/STM-4 (DS3) line card uses a 16-bit Cyclic Redundancy Check by default, but also supports a 32-bit CRC to detect errors in transmitted data. You can set the CRC by entering the crc interface configuration command. The router that sends the data divides the bits in the frame message by a predetermined number to calculate a frame check sequence (FCS). Before sending the data, the router appends the FCS value to ensure that the frame message contents are exactly divisible by a predetermined number. The router that receives the data divides the frame message by the same predetermined number and calculates the FCS. If the result is not 0, the router that receives the data assumes that a transmission error occurred and sends a request to the router to resend the data.

Cisco IOS Software Configuration for the 1-Port Channeliz ed OC- 12/STM-4 (DS3) Line Card

Note When enabling a 16-bit or 32-bit CRC on a local interface, ensure that the remote device is also

configured for a 16-bit or 32-bit CRC.

Configuring the Clock Source

The only exception for matching local and remote DS3 po rt configurat ions is that the clock sources must be set opposite each other. Therefore, if you enter the clock source line controller configuration command, you must enter clock source internal for the remote DS3 port. The ADM clock source is configured to internal.

Specifying DS3 Channel Framing

In interface configuration mode, specify DS3 framing by entering the framing [c-bit | m13] interface configuration. Use the no form of this command to return to the default, c-bit framing.

Using show Commands to Check System Status

Each Cisco 12000 Series Router line card maintains information about its configuration, traffic, errors, and so on. Y ou can access this information by using the show commands. Following are descriptions and examples of the show commands.

• The show interfaces command outputs information about the system interfaces. Following is a

sample of the show interface serial command for port 0 of a line card installed in slot 1, channel 1:

Router# show interfaces serial 1/0:1 Serial1/0:1 is up, line protocol is up Hardware is OC12-Channelized-to-DS3 channel Internet address is 101.5.1.2/24 MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, rely 255/255, load 1/255 Encapsulation HDLC, crc 16, loopback not set Keepalive set (10 sec) Last input 00:00:05, output 00:00:03, output hang never

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Last clearing of "show interface" counters 1d16h Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 18617 packets input, 1537679 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 parity 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 16834 packets output, 2198122 bytes, 0 underruns 0 output errors, 0 applique, 0 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions Router#

• The following commands are line card specific and are executed from the line card only. To log on

to the line card and execute the follo wing commands, use the attach [slot number] EXEC command, as shown in the following example:

Router# attach 1 slot1# enable slot1#

• To display controller information about an instance of an OC-12 controller, an instance of a DS3

channel controller, or both, as viewed from the line card, use the following versions of the show controllers oc12 EXEC command:

–

show controllers oc12 slot/port

Display information about an OC-12 controller by entering the sho w controllers oc12 slot/port command for a 1-port channelized OC-12/STM-4 (DS3) line card:

Router# show controllers oc12 1/0

OC12_CH_DS31/0 The current state of the controller is up Current configurable parameter settings: Clock source is INTERNAL, Loopback is NONE SECTION LOF = 0 LOS = 0 RDOOL = 0 BIP(B1) = 0 Active Alarms: None LINE AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0 Active Alarms: None PATH 1 AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Alarms: None S1S0 = 02, C2 = 04 PATH TRACE BUFFER : STABLE PATH 2 AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Alarms: None S1S0 = 03, C2 = FF PATH TRACE BUFFER : STABLE

(Remainder of displayed text omitted from example.)

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–

show controllers oc12 slot/port:channel#

Verify the Cisco Remote Connection Management configuration by entering the show controllers oc12 slot/port:channel# command, as shown in the following example:

Router# show controllers oc12 1/0:1

Controller OC12 1/0, interface Serial1/0:1 (DS3 channel 1) cdb = 0x616BED10, base_hwidb = 0x613B5540, hwidb = 0x613B6520 ssb = 0x616C46A0, ds = 0x616C43E8 Line state is up rxLOS inactive, rxLOF inactive, rxAIS inactive txAIS inactive, rxRAI inactive, txRAI inactive Current configurable parameter settings: Loopback is none, Framing is c-bit DSU mode is cisco, DSU bandwidth limit is 44210 Payload scrambling is disabled, CRC is 16 Bert pattern is disabled, Bert interval is 0 Transmitter delay is 0, Encapsulation is HDLC Idle character is flags, Invert data is disabled Remote fullrate has no request outstanding Remote accept is enabled, MTU is 4470 MIB information: Data in current interval (366 seconds elapsed): 0 Line Code Violations, 0 P-bit Coding Violations 0 C-bit Coding Violations 0 P-bit Err Secs, 0 P-bit Sev Err Secs 0 Sev Err Framing Secs, 0 Unavailable Secs 0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs No alarms detected. Router#

–

show controllers oc12 detail Vie w details about an OC- 12 controller by entering the sho w controllers oc12 detail command:

Router# show controllers oc12 detail OC12_CH_DS31/0 The current state of the controller is up Current configurable parameter settings: Clock source is INTERNAL, Loopback is NONE SECTION LOF = 0 LOS = 0 RDOOL = 0 BIP(B1) = 0 Active Alarms: None LINE AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0 Active Alarms: None PATH 1 AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Alarms: None S1S0 = 02, C2 = 04 PATH TRACE BUFFER : STABLE

61 6D 69 74 2D 62 66 72 00 00 00 00 00 00 00 00 anew-day........

00 00 00 00 00 00 00 00 53 65 72 69 61 6C 35 2F ........Serial5/

30 3A 31 00 00 00 31 30 31 2E 35 2E 31 2E 31 00 0:1...101.5.1.1.

00 00 00 00 00 00 30 30 30 30 30 30 30 30 0D 0A ......00000000..

PATH 2 AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Alarms: None S1S0 = 03, C2 = FF PATH TRACE BUFFER : STABLE

FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................

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FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................

Router

• Use the show protocols command to display the global (system-wide) and interface-specific status

of any configured Level 3 protocol.

• Use the show running-config command to display the currently running configuration in RAM.

Here is an example:

Router# show running-config Building configuration...

Current configuration: ! ! No configuration change since last restart ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption service internal ! clock timezone PST -8 clock summer-time PDT recurring clock calendar-valid !

ip subnet-zero ip ftp source-interface Ethernet0 ip ftp username anewday ip ftp password anewday no ip domain-lookup ip host apark 201.205.254.254 frame-relay switching clns routing ! controller OC12 1/0 clock source internal ! ! interface Serial 1/0:1 ip address 100.1.1.1 255.255.255.0 no ip directed-broadcast encapsulation ppp crc 32 dsu mode kentrox ! interface Serial 1/0:2 ip address 100.2.2.2 255.255.255.0 no ip directed-broadcast dsu mode larscom dsu bandwidth 30000 !

(Remainder of displayed text omitted from example.)

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OC-12

Internal loopback

11979

Using Loopback Commands

The 1-port channelized OC-12/STM-4 (DS3) line card supports loopback modes for both the OC-12 controller and for each of the associated DS3 channels. Specify the loopback mode by entering one of the loopback interface configuration commands shown in Table 5. Use the no form of this command to restore the default value, no loopback, which represents the normal operation between the local end (TX) and the remote end (RX).

Table 5 DS3 Supported Loopback Modes

Loopback modes Configuration Mode Command

Diagnostic or local loopback loopback local Router(config-if)# loopback local Network loopback loopback network Router(config-if)# loopback

Remote loopback loopback remote Router(config-if)# loopback remote Defa u l t va l u e default value Router(config-if)# no loopback

Cisco IOS Software Configuration for the 1-Port Channeliz ed OC- 12/STM-4 (DS3) Line Card

network

Figure 1 shows data flows for the various loopback modes.

Figure 1 Transmit and Receive Loopback Data Flows

Fiber

Line

loopback

OC-12 Controller Loopback Mode

The OC-12 controller supports two loopback modes:

• Internal—This loopback mode loops data from the transmit path to the receive path at the

mux/demux location on the line card, allowing diagnostics to send data to itself at the OC-12 level without relying on external conn ections. In controller con figuration mode, set the loopback mode to internal, using the [no] loopback [internal | line ] configuration command:

Router(config-controller)# loopback internal Router(config-controller)#

Use the no form of this command to restore the default value, no loopback.

OC-12

Mux/

demux

STTX

SUNI

622

STS-3

Layer 3

routing engine

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• Line—This loopback mode loops data from the receive path to the transmit path at the mux/demux

part on the line card, returning all received data at the OC-12 level to the far end. In controller configuration mode, set the loopback mode to line, using the [no] loopback [internal | line] configuration command:

Router(config-controller)# loopback line Router(config-controller)#

Use the no form of this command to restore the default value to no loopback.

DS3 Channel Loopback Mode

The DS3 channel supports three loopback modes:

• Local—This loopback mode loops data from the transmit path to the receive path at the QJET

location on the line card, allowing diagnostics to send data to itself over a single channel without relying on external connections. In serial interface configuration mode, set the loopback mode to local, using the [no] loopback [local | network | remote ] configuration command, as in the following example:

Router(config-if)# loopback local

Use the no form of this command to restore the default value, no loopback.

• Network—This loopback mode loops data from the STS1 recei ve path to the STS1 transmit path at

the Mapper location on the line card, returning all recei ve d data o ver a single channel to the f ar end. In controller configuration mode, set the loopback mode to local, using the [no] loopback [local | network | remote ] configuration command:

Router(config-if)# loopback network

Use the no form of this command to restore the default value, no loopback.

• Remote—This loopback mode sends an FEAC message over a single channel to the far end,

requesting that it transition into network loopback mode. In controller configuration mode, set the loopback mode to local, using the [no] loopback [local | network | remote ] configuration command, as in the following example:

Router(config-if)# loopback remote

Use the no form of this command to restore the default value, no loopback.

Configuring DS3 Port BER Testing

You can set one local DS3 serial port to bit error rate test (BERT) mode while the remaining local seri al ports continue to transmit and receive normal traffic. A BERT checks communication between the local and the remote DS3 ports. If traffic is not being transmitted or received, create a back-to-back loopback BER test and send out a predictable st ream to ensure that you receiv e the same data that was transmitted. T o determine if the remote DS3 serial port returns the BER T patter n unchanged, the system administrator for the remote router must manually set the remote DS3 serial port to loopback network l ine, while you enter a bert pattern interface configuration command at specified time intervals on the local DS3 serial port.

The following example shows the output from a back-to-back loopback BER test. The router types are a Cisco 12012 Router on the local (near) end, and a Cisco 12008 Router on the remote (far) end. Keepalive is disabled, while the loopback network line test runs between both routers. Clock source is

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set to internal on the local OC-12 controller in slot 1 with IP address 10.0.0.2. Clock source is set to line on the remote OC-12 controller in slot 1 with IP address 11.0.0.1. A BERT pattern is entered

between local serial port 8/1 and remote serial port 5/1:

clock source internal----------clock source line no keepalive-------------------loopback network line----------no keepalive Router:[gsr-1]-----------------[mfr-1] [BERT Pattern] Serial8/1----------------------Serial5/1 [11.0.0.2]---------------------[11.0.0.1]

Router(config)# interface serial 6/0 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)#

Table 6 lists the BERT patterns, explains how to in voke them, and specifies test intervals between 1 and

1140 minutes long. The no bert pattern interface configuration command terminates an ongoing BER test and returns the local and remote DS3 serial ports to the default value.

Table 6 DS3-Supported BERT Patterns

BERT Pattern To Invoke Command

2^15 A pseudorandom repeating pattern

that is 32767 bits long

2^20 A pseudorandom repeating pattern

that is 1048575 bits long

qrss 2^20 A quasirandom signal source Router (config-if)# bert pattern qrss 2^23 A pseudorandom repeating pattern

that is 8388607 bits long

Checking Bit Errors Using a BERT

Following is an example of the bert pattern command and specified time intervals that will cause the BERT to send the pseudorandom pattern 2^23 and repeat on the first DS3 channel for 10 minutes:

Router# configure terminal Router(config)# interface serial 1/0:1 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)# end Router(config)# end Router#

Router (config-if)# bert pattern 2^15 interva l 10

Router (config-if)# bert pattern 2^20 interva l 10

Router (config-if)# bert pattern 2^23 interva l 10

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Entering Errors in BER Tests

To insert intentional errors into the BER test stream, use the following command syntax: bert errors [no-of-errors], where the no-of-errors default is 1 and the range is 1 to 255, inclusive. The following example shows the command used to insert f i v e errors into the current BER test stream that i s running the pseudorandom pattern 2^23 that repeats on the first DS3 channel for 10 minutes:

Router# configure terminal Router(config)# interface serial 1/0:1 Router(config-if)# bert pattern 2^23 interval 10 Router(config-if)# bert errors 5 Router(config-if)# end Router(config)# end Router#

Using show Commands to Verify BERT Configuration

When the DS3 serial port is running a BER T, the serial port state is down, and only BER T data is passed. You c an use th e show commands shown in Table 7 to verify if the line card state is up or down.

Table 7 Show Commands for BERT Configuration

Commands Explanation

show controller oc12 n/port:channel Shows the current controller status, where n is the slot

number.

show controller oc12 1/0:1 bert Shows the fields of a BER test that is still in progress.

The following output indicates that BERT is enabled with a pattern of 2^23 and an interval of 10 minutes:

Router# show controller oc12 1/0:1 bert

Interface Serial1/0 (DS3 port 1) BERT information: State :enabled (sync'd) Pattern :2^23 Interval :10 minutes Time remaining :00:09:44 Total errors :0 Time this sync :00:00:10 Errors this sync :0 Sync count :1 Router#

Note The bit error test patterns from the serial ports on a 1-port channelized OC-12/STM-4

(DS3) line card are framed test patterns; therefore, they are inserted into the payload of a framed T3 signal.

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The following example shows the information of a BER test that is still in progress:

Router# show controller OC12 1/0:1 bert

Interface Serial1/0:1 (DS3 port 1) BERT information: State :enabled (sync'd) Pattern :2^23 Interval :10 minutes Time remaining :00:01:44 Total errors :0 Time this sync :00:08:10 Errors this sync :0 Sync count :1 Router#

Note When the DS3 is running a BERT, the Total Bit Errors value is not valid if the Status field

is Not Sync.

The following is an example of a screen display from a completed BER test:

Router# show controller OC12 1/0:1 bert

Interface Serial1/0:1 (DS3 port 1) BERT information: State :disabled (sync'd, completed) Pattern :2^23 Interval :10 minutes Time remaining :00:00:00 Total errors :0 Time this sync :00:09:54 Errors this sync :0 Sync count :1 Router#

Table 8 provides explanations of the BERT display fields in the previous examples:

Table 8 BER Test Display Fields

BERT Information Explanation

State: enabled (not synchronized

) BER test is active, but the hardware has not currently

synchronized. Errors are counted only when the hardware has synchronized.

State: enabled (synchronized) BER test is active, and the hardware has synchronized. Any errors

encountered are counted.

State: disabled (not synchronized, failed)

BER test is finished and the test resulted in failure, either because the hardware never synchronized or the physical layer interface module (PLIM) declared the test a failure.

State: disabled (synchronized,

BER test is finished because the interval expired.

completed) State: disabled (synchronized,

aborted)

BER test is finished as a result of a user request (for example, no bert)

Pattern Can be any one of the supported BERT patterns. Interval Can be any value from 1 to 1440 (units are in minutes).

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Table 8 BER Test Display Fields (continued)

BERT Information Explanation

Time remaining Can be any value from 1 second to the interval provided,

formatted as hh:mm:ss.

Total errors The total number of errors encountered while the hardware is

synchronized.

Time this synchronization If the hardware is currently synchronized, the amount of time

since synchronization began, formatted as hh:mm:ss. If it is not currently synchronized but was synchronized earlier, indicates the amount of time that the last or most recent synchronization period lasted, formatted as hh:mm:ss.

Errors this synchronization If the hardware is currently synchronized, the number of errors

encountered during the current sync period. If it is not currently synchronized but was synchronized earlier, the number of errors encountered during the last or most recent synchronization period.

Synchronization count The number of times synchronization was achieved.

Configuration Examples for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Figure 2 shows two 1-port channelized OC-12/STM-4 (DS3) line card configuration examples. In the

first example, the 1-port channelized OC-12/STM-4 (DS3) line card is channel 1 in router slot 1, and is connected to a Cisco 7500 Series Router with an HSSI port through an external DSU.

In the second example, the 1-port channelized O C- 12/STM-4 (DS3) line card is channel 5 in router slot 1, and is connected to a Cisco 7200 Series Router with a T3 serial port adapter with integrated DSUs/CSUs.

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Cisco 12000

with integrated CSU/DSU

A D P

Configuration Examples for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Figure 2 1-Port Channelized OC-12/STM-4 (DS3) Line Card Interoperability Diagram

Cisco 7500

HSSI

DigitalLink Larscom Kentrox

Sonet Ring

ADM

Channel

CHOC12 to DS3

DSU

OC-12

ADM

Cisco 12000

Channel 1 (1/0:1) Channel 5 (1/0:5) Add Drop Multiplexer

Data Service Unit

T3 Serial port adapter

A-T3

ADM

CHOC12 to DS3

DS3

PA-T3

Cisco 720

1741

The following example shows a typical conf iguration for a channel, associated with a 1-port channelized OC-12/STM-4 (DS3) line card, that is connected to a Cisco 7200 Series Router with a T3 serial port adapter (see Figure 2):

Router# configure terminal Router(config)# interface serial 1/0:5 Router(config-if)# dsu mode cisco Router(config-if)# dsu bandwidth 44210 Router(config-if)# framing c-bit Router(config-if)# no scramble Router(config-if)# crc 16 Router(config-if)# keepalive Router(config-if)# ip address 1.1.5.1 255.255.255.0 Router(config-if)# no shutdown

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Additional References

The following sections provide references related to the 1-port channelized OC-12/STM-4 (DS3) line card.

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Cisco IOS Software Configuration for the 1-Port Channeliz ed OC- 12/STM-4 (DS3) Line Card

Cisco IOS Release 12.0(8)S

Cisco Systems OC-12-STM-14 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Prerequisites for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Information About the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Configuring the OC-12 Controller

Configuring the DS3 Serial Interface

Cisco Remote Connection Management

Verifying Local and Remote DS3 Port Settings

Selecting a DSU Mode

Setting the Sending and Receiving Rate

Configuring the DSU Bandwidth Range

Enabling Payload Scrambling

Configuring Cyclic Redundancy Checks

Configuring the Clock Source

Specifying DS3 Channel Framing

Using show Commands to Check System Status

Using Loopback Commands

OC-12 Controller Loopback Mode

DS3 Channel Loopback Mode

Configuring DS3 Port BER Testing

Checking Bit Errors Using a BERT

Entering Errors in BER Tests

Using show Commands to Verify BERT Configuration

Configuration Examples for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Additional References

Related Documents

Technical Assistance