6-Port and 12-Port DS3 Line Card Software Configuration on Cisco 12000 Series Routers
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Table Of Contents
Cisco IOS Software Configuration for the 6-Port and 12-Port DS3 Line Card
Prerequisites for the 6-Port and 12-Port DS3 Line Cards
Information About the 6-Port and 12-Port DS3 Line Cards
How to Configure the 6-Port and 12-Port DS3 Line Cards
Configuration Scenarios for the 6-Port and 12-Port DS3 Line Cards
Configuring 6-Port and 12-Port DS3 Line Card Interfaces
Configuring DS3 Serial Interfaces
Using show Commands to Check System Status
Customizing the 6-Port and 12-Port DS3 Line Card Configuration
Verifying Local and Remote DS3 Port Settings
Setting the Sending and Receiving Rate
Configuring the DSU Bandwidth Range
Configuring Cyclic Redundancy Checks
Verifying Customized Configuration
Specifying DS3 Port Loopback Modes
Configuring DS3 Port BER Testing
Checking Bit Errors Using a BERT
Using show Commands to Verify BERT Configuration
Cisco IOS Software Configuration for the 6-Port and 12-Port DS3 Line Card
This document describes the software configuration procedure for the 6-port and 12-port DS3 line cards on the Cisco 12000 Series Router. These line cards are sometimes referred to as the 6DS3-SMB and 12DS3-SMB line cards.
12.0(5)S
This feature was introduced.
12.0(8)S
B release of these line cards was introduced
Feature History for the 6-Port and 12-Port DS3 Line Card
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
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Prerequisites for the 6-Port and 12-Port DS3 Line Cards
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Prerequisites for the 6-Port and 12-Port DS3 Line Cards
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 requirements of the 6-port and 12-port DS3 line cards.
Information About the 6-Port and 12-Port DS3 Line Cards
The 6-port and 12-port DS3 line cards consist of high-density DS3 service through six T3 or twelve T3 interfaces.
The 6-port line card is a partially depopulated version of the 12-port line card. The 6-port line card consists of a total of 12 connectors, numbered 0 to 5. The 12-port line card consists of a total of 24 connectors, numbered 0 to 11. A single port consists of one coaxial connector for receiving (RX) and one coaxial connector for transmitting (TX).
How to Configure the 6-Port and 12-Port DS3 Line Cards
The following sections provide procedures and examples that describe how to configure and verify 6-port and 12-port DS3 line card configuration:
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Configuration Scenarios for the 6-Port and 12-Port DS3 Line Cards
You can configure the 6-port or 12-port DS3 line card in a router with another device by using a data service unit (DSU) that supports any of the three third-party DSU vendors: Digital-Link, Kentrox, and Larscom. If you use a DSU to make the connection between the Cisco 12000 Series Router and another device, you must set the DSU mode on the local DS3 port configuration to match the DSU mode on the remote DS3 port configuration. Therefore, if the remote DS3 port uses the Kentrox vendor, it sends a request to the local DS3 port to change the DSU mode to Kentrox. The left configuration example in Figure 1 shows the 6-port or 12-port DS3 line card in a Cisco 12000 Series Router connected to a Cisco 7200 Router with a high-speed serial interface (HSSI) port through an external DSU.
If you make a direct connection between a router and another device, the local DS3 port configuration and the remote DS3 port are both set to the Cisco DSU mode, because there is no intervening third-party DSU. The configuration example on the right in Figure 1 shows the Cisco DSU mode.
Figure 1 6-Port and 12-Port DS3 Configuration Example
Configuring 6-Port and 12-Port DS3 Line Card Interfaces
This section provides basic information to configure an interface and to specify IP routing. You can also enter other configuration commands and options, depending on the requirements of your system. To configure the 6-port and 12-port DS3 line card interfaces, you must identify the router slot where the line card is installed (for example, slot 7). Use the show diag EXEC command to verify that the system recognizes the line card.
Router# show diag 2SLOT 2 (RP/LC 2 ):6 Port Packet over DS3Router#(Remainder of displayed text omitted from example.)
If you know that there is more than one 6-port or 12-port DS3 line card installed in the router, use the show diag summary EXEC command to see the types of line cards that are installed in all the router slots. The following output shows a 6-port DS3 line card in slot 2 and a 12-port DS3 line card in slot 6.
Router# show diag summSLOT 0 (RP/LC 0 ):1 Port Packet Over SONET OC-12c/STM-4c Single ModeSLOT 1 (RP/LC 1 ):1 port SONET OC12 channelized to DS3 Single ModeSLOT 2 (RP/LC 2 ):6 Port Packet over DS3 <<<<<----see DS3 line cardSLOT 4 (RP/LC 4 ):4 Port Packet Over SONET OC-3c/STM-1 Single ModeSLOT 6 (RP/LC 6 ):12 Port Packet over DS3 <<<<<----see DS3 line cardRouter#If you want to address a specific 6-port or 12-port DS3 line card interface, refer to interface slot 2 or interface slot 6, as shown in the previous output example.
If you want to address a specific port on the 6-port DS3 or 12-port DS3 line card, refer to the router slot number and one of the serial interface port numbers.
Based on the previous output example:
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To configure a 6-port or 12-port DS3 line card interface, perform the following:
Step 1
Router> enablepasswordRouter#Step 2
Step 3
Router# endRouter>
Table 1 shows default values for the DS3 serial interface configuration of an enabled line card. For more information, see the configuration examples in this section.
Table 1 6-Port and 12-Port DS3 Line Card Serial Interface Default Values
BERT1 interval
interval {1-1440}
none
BERT number of errors
range 1 to 255 inclusive
1
BERT pattern
bert pattern {2^15 |2^20 | qrss |2^23 | 0s|1s}
[no] bert
Clock source
clock source [internal | line]
line
Cyclic redundancy check
crc [16 | 32]
16
DSU mode
[no] dsu mode [cisco | digital-link | kentrox | larscom]
cisco
DSU subrate bandwidth
[no] dsu bandwidth kbps
44210
Encapsulation
encapsulation [hdlc | ppp| frame-relay]
hdlc
Far-end DSU bandwidth
[no] dsu remote fullrate
subrate
Framing mode
[no] 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 10
Loopback mode
[no] loopback [local | network line | network payload | remote]
no loopback
Maximum transmission unit
[no] mtu bytes
4470 bytes
Payload scrambling
[no] scramble
no scramble
Remote requests
[no] dsu remote accept
accept
Transmitter delay
[no] transmitter-delay # of idle characters
0-255
1 BERT=bit error rate test
Configuring DS3 Serial Interfaces
This section explains basic configuration information to enable each 6-port or 12-port DS3 line card port as an interface and to specify IP routing. You can configure the ports in any sequence. Therefore, the IP addresses assigned to each port do not have to be numbered in sequential order. You can also enter other configuration commands and options, depending on the requirements of your system.
Use the following procedures to configure the port 0 interface on the 12-port DS3 line card in slot 6, which makes the serial interface slot/port 6/0.
Step 1
Router# configure terminalRouter(config)#Step 2
Router(config)# interface serial 6/0Step 3
Router(config-if)# ip address 1.1.1.11 255.0.0.0Step 4
Router(config-if)# framing c-bitStep 5
Router(config-if)# transmitter-delay 0Step 6
Router(config-if)# scrambleStep 7
Router(config-if)# no keepaliveAlthough some encapsulations benefit from keepalive processing (for example, HDLC), the Cisco 12000 Series Routers do not require keepalive messages.
Step 8
Router(config-if)# no shutdownStep 9
Step 10
Step 11
Router# copy running-config startup-configThe system displays an OK message when the configuration has been stored.
After you have completed the configuration, you can check it using show commands. Use the show controller EXEC command for each interface to verify the port interface status. See the "Using show Commands to Check System Status" section.
Using show Commands to Check System Status
Each line card in a Cisco 12000 Series Router maintains information about its configuration, traffic, errors, and so on. You can access this information by using the show commands. Following are descriptions and examples of the show commands.
To see the status of the 6-port or 12-port DS3 line card you configured in the "Configuring DS3 Serial Interfaces" section, enter the show controller serial EXEC command.
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Router# show controller serial 6/0Interface Serial6/0 (DS3 port 0)hwidb = 0x611BF9A0ssb = 0x61642218, ds = 0x61642120Line state is administratively downrxLOS inactive, rxLOF inactive, rxAIS inactive <<<<<----see Alarm statustxAIS inactive, rxRAI inactive, txRAI inactive <<<<<----see Alarm statusCurrent configurable parameter settings:Loopback is none, Framing is c-bit <<<<<----see loopback and framing settingsClock source is line, Cable length is 50 <<<<<-see clock source and cable lengthDSU mode is cisco, DSU bandwidth limit is 44210 <<<<<--see DSU mode and bandwidthPayload scrambling is disabled, CRC is 16 <<<<<----see scramblingBert pattern is disabled, Bert interval is 0 <<<<<----see BERT pattern statusTransmitter delay is 0, Encapsulation is HDLC <<<<<----see Transmitter delayIdle character is flags, Invert data is disabledRemote fullrate has no request outstanding <<<--see far-end DSU bandwidthRemote accept is enabled, MTU is 4470 <<<<<----see Remote acceptRouter#(Remainder of displayed text omitted from example.)
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Router# show versionCisco Internetwork Operating System SoftwareIOS (tm) GS Software (GSR-P-M), Version 12.0(5)SCopyright (c) 1986-1999 by cisco Systems, Inc.Compiled Fri 16-April-99 09:21Image text-base: 0x60010900, data-base: 0x6061E000Router#(Remainder of displayed text omitted from example.)
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Router#show interfaces serial 6/0Serial6/0 is up, line protocol is upHardware is DS3 line cardInternet address is 1.1.1.11/24MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, rely 255/255, load 1/255Router#(Remainder of displayed text omitted from example.)
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Router# show protocolsGlobal values:Internet Protocol routing is enabledInternet address is 1.1.11.1/16Serial6/0 is up, line protocol is upSerial6/1 is up, line protocol is upSerial6/2 is up, line protocol is upSerial6/3 is up, line protocol is upSerial6/11 is up, line protocol is upInternet address is 1.1.11.1/16Router#(Remainder of displayed text omitted from example.)
Customizing the 6-Port and 12-Port DS3 Line Card Configuration
There are two sides to the network, a local network side and a remote customer side, or near and far ends. The 6-port and 12-port DS3 line cards support third-party data service units (DSUs), Internet Service Provider (ISP)-provided DS3 lines, and so on. You can change the configuration parameter default values in the 6-port or 12-port DS3 line card port interfaces to match the remote DSUs on your network. Table 2 shows the configuration parameters.
Note
Verifying Local and Remote DS3 Port Settings
You can use telnet to determine the DSU mode settings on the remote DS3 port. Once you verify the remote DS3 port settings, you can negotiate changing configuration parameters so that DSU mode settings are the same on both the local and remote DS3 ports. You can set the DSU bandwidth 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, Kentrox, 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, or by using the Cisco Remote Connection Management (CRCM) feature to remotely configure the remote DS3 port. If you make a direct connection between a Cisco 12000 Series Router and another device, you can use the Cisco DSU mode. See Figure 1 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 the sending 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 you reduce the effective bandwidth to 3000 on the local port, you must do the same on the remote port by entering the dsu bandwidth interface configuration command.
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 6-port and 12-port DS3 line cards use a 16-bit Cyclic Redundancy Check by default, but also support a 32-bit CRC to detect errors in transmitted data. You can set the CRC by entering the crc 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.
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Configuring the Clock Source
Configuration of clock source can be performed either on one or both the local and remote DS3 ports. Therefore, if you enter the clock source internal command for the local DS3 port, you can select either clock source line or clock source internal for the remote DS3 port
Verifying Customized Configuration
To display controller information about local and remote DS3 ports and the requests sent between them, use the show controllers serial slot/port details command or the show controllers serial slot/port all command. The following shows output from the show controllers DS3 details command:
Router# show controllers serial 2/0 detailsInterface Serial2/0 (DS3 port 0)hwidb = 0x61179020ssb = 0x615E8D54, ds = 0x615E5430Line state is uprxLOS inactive, rxLOF inactive, rxAIS inactivetxAIS inactive, rxRAI inactive, txRAI inactiveCurrent configurable parameter settings:Loopback is none, Framing is c-bitDSU mode is cisco, DSU bandwidth limit is 44210Payload scrambling is disabled, CRC is 16Bert pattern is disabled, Bert interval is 0Transmitter delay is 0, Encapsulation is PPPIdle character is flags, Invert data is disabledRemote fullrate has no request outstandingRemote accept is enabled, MTU is 4470Incoming far end requests:0 Total requests0 Loopback requests, 0 No loopback requests0 Full rate requests, 0 No full rate requests0 Rejected requests, 0 Unknown requests(Remainder of displayed text omitted from example.)
Specifying DS3 Port Loopback Modes
You can test the flow of data traffic by entering one of the three loopback paths that the DS3 controller supports. Specify the loopback mode by entering one of the loopback interface configuration commands shown in Table 3. 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).
Each loopback path exists for each of the 6-port or 12-port DS3 line card ports. All loopback configuration is done in the QJET, a quad DS3 framer that provides DS3 payload and limited bit error rate test (BERT) functionality. Figure 2 shows the data flow for three loopback configuration paths, including no loopback.
Figure 2 DS3 Loopback Paths
This section explains how to use loopback commands to test data traffic:
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Router# configure terminalRouter(config)# interface serial 6/0Router(config-if)#–
Router(config-if)# loopback local–
Router# configure terminalRouter(config-if)# clock source internal•
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Router# configure terminalRouter(config)# interface serial 6/0Router(config-if)#–
To set the loopback mode to network, enter the loopback network payload interface configuration command, as shown in the following example:
Router(config-if)# loopback network payload–
To set the loopback mode to network, enter the loopback network line interface configuration command, as shown in the following example:
Router(config-if)# loopback network line–
Router# configure terminalRouter(config-if)# clock source line
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Router# configure terminalRouter(config)# interface serial 6/0Router(config-if)#–
Router(config-if)# loopback remoteUse the no form of this command to restore the default value, no loopback, and to send a far end alarm and control (FEAC) message to the far end requesting that it exit network loopback mode.
Configuring DS3 Port BER Testing
You can set one local DS3 serial port to bit error rate test (BERT) mode while the remaining local serial 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 stream to ensure that you receive the same data that was transmitted. To determine if the remote DS3 serial port returns the BERT pattern unchanged, the system administrator for the remote router must manually set the remote DS3 serial port to loopback network line, 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 Internet Router on the local (near) end, and a Cisco 12008 Series Router on the remote (far) end. Keepalive is disabled, while the loopback network line test runs between both routers. Clock source is set to internal on the local serial port 8, in slot 1 with IP address 10.0.0.2. Clock source is set to line on the remote serial port 5, 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 lineno keepalive -------------------loopback network line----------no keepaliveRouter:[gsr-1] -----------------[mfr-1][BERT Pattern]Serial8/1----------------------Serial5/1[11.0.0.2]---------------------[11.0.0.1]Router(config)# interface serial 6/0Router(config-if)# bert pattern 2^23 interval 10Router(config-if)#Table 4 lists the BERT patterns, explains how to invoke 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.
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 terminalRouter(config)# interface serial 6/0Router(config-if)# bert pattern 2^23 interval 10Router(config-if)# endRouter(config)# endRouter#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 five errors into the current BER test stream that is running the pseudorandom pattern 2^23 that repeats on the first DS3 channel for 10 minutes:
Router# configure terminalRouter(config)# interface serial 6/0Router(config-if)# bert pattern 2^23 interval 10Router(config-if)# bert errors 5Router(config-if)# endRouter(config)# endRouter#Using show Commands to Verify BERT Configuration
When the DS3 serial port is running a BERT, the serial port state is down, and only BERT data is passed. However, when using show commands, the line card state may be displayed as up or down. Table 5 lists show commands for BERT.
The following output indicates that BERT is enabled with a pattern of 2^23 and an interval of 10 minutes:
Router# show controller serial 6/0 bertInterface Serial6/0 (DS3 port 1)BERT information:State :enabled (sync'd)Pattern :2^23Interval :10 minutesTime remaining :00:09:44Total errors :0Time this sync :00:00:10Errors this sync :0Sync count :1Router#
Note
The following example shows the information of a BER test that is still in progress:
Router# show controller serial 6/0 bertInterface Serial6/0 (DS3 port 1)BERT information:State :enabled (sync'd)Pattern :2^23Interval :10 minutesTime remaining :00:01:44Total errors :0Time this sync :00:08:10Errors this sync :0Sync count :1Router#
Note
The following is an example of a screen display from a completed BER test:
Router# show controller serial 6/0 bertInterface Serial6/0 (DS3 port 1)BERT information:State :disabled (sync'd, completed)Pattern :2^23Interval :10 minutesTime remaining :00:00:00Total errors :0Time this sync :00:09:54Errors this sync :0Sync count :1Router#Table 6 provides explanations of the BERT display fields in the previous examples.
Additional References
The following sections provide references related to the 6-port and 12-port DS3 line cards.
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