Cisco Line Cards

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Contents

Network Management Feature Descriptions

Administrative and management access to the 1-Port CHOC-12 ISE line card is provided through the standard console and Telnet CLI as well as through SNMP network management software such as CiscoWorks 2000. For MIB information, see the "MIBs" section.

Layer 1 Software Feature Descriptions

The following subsections sections identify the major software supported features provided by the
1-Port CHOC-12 ISE line card.

SONET and SDH

The following options are configured and monitored at the port level:

STS-1 to VTG to VT1.5 to DS1

STS-1 to DS3 to DS1

AU-4 to TUG-3 to TUG-2 to VC-12 to E1

AU-3 to TUG-2 to VC-11 to DS1

DS1 Features

DS1s can be configured and monitored on a per-T1 channel basis. The 1-Port CHOC-12 ISE line card supports the following DS1 features:

E1 Features

E1s can be configured and monitored at the individual E1 channel level. The 1-Port CHOC-12 ISE line card supports the following E1 features:

Automatic Protection Switching

Automatic Protection Switching (APS) provides redundancy on SONET equipment to guard against line failures. The 1-Port CHOC-12 ISE line card supports the following APS features:

Online Insertion and Removal

The Online Insertion and Removal feature (OIR) permits the removal or insertion of a
1-Port CHOC-12 ISE line card without disrupting the packet forwarding or routing of other line cards operating in the same chassis. For additional information on OIR, see the document, Cisco 12000 Series 1-Port Channelized OC-12/STM-4 (DS1/E1) ISE Line Card Installation and Configuration at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis12000/linecard/lc_chan/13921c12.htm

Layer 2 Software Feature Descriptions

The following subsections provide an overview of the wide area network protocols supported on the 1-Port CHOC-12 ISE line card:

Cisco High-level Data Link Control Protocol

The 1-Port CHOC-12 ISE line card supports standard Cisco HDLC encapsulation.

Frame Relay Protocol

The 1-Port CHOC-12 ISE line card supports the following frame relay features:

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Note    The current Cisco IOS limitations are 2,048 IDBs per line card. Because each interface requires at least one hardware IDB and one software IDB, the limit of 1,024 DLCIs applies to each card.

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Note    Forward explicit congestion notification (FECN) and backward explicit congestion notification (BECN) signaling are not supported at this release.

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Multilink Point to Point Protocol

Compliant with the PPP Multilink Protocol (MP) RFC 1990, The 1-Port CHOC-12 ISE line card supports the following Multilink Point to Point Protocol(MLPPP) features:

Multilink Frame Relay

Compliant with the Multilink Frame Relay UNI/NNI Implementation Agreement (FRF. 16), the1-Port CHOC-12 ISE line card supports the following features:

Layer 3 Software Feature Descriptions

The 1-Port CHOC-12 ISE line card layer 3 software features are a subset of Cisco IOS 12.0(27)S1 and Cisco IOS 12.0(26)S. These features are described or referenced in the document, Cross-Platform Release Notes for Cisco IOS Release 12.0 S, Part 2: New Features and Important Notes at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/relnote/xprn120s/120snewf.htm

How to Configure Layer 1 Features

The following sections provides the following configuration procedures for the 1-Port CHOC-12 ISE line card:

Restrictions

The 1-Port CHOC-12 ISE line card can be installed only in the Cisco 12000 Series Router. The hardware and software configuration procedures and tasks are similar to all other Cisco 12000 Series Router line cards.

Each 1-Port CHOC-12 ISE line card requires 512 interface description blocks (IDBs) describing the DS1 channels (one per DS1 channel). We recommend that you install no more than two 1-Port CHOC-12 ISE line cards on a Cisco 12000 Series Router chassis.

Configuring the SONET Controller

Summary Steps

1. enable

2. configure terminal

3. controller sonet slot/port

4. framing {sonet | sdh}

5. clock source {internal | line}

6. description string

7. report {all | event}

8. threshold type value

9. overhead s1s0 number

10. overhead c2 number

11. overhead j1 length [16 | 64]

12. overhead j1 message

Table 1 lists the SONET controller default values.

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 1  controller sonet slot/port Example: Router(config)# controller sonet 1/0 Selects the physical port to configure, and enters controller configuration mode. The 1-Port CHOC-12 ISE line card only has port 0. To shut down the SONET controller, use the shutdown controller command. When shut down, the OC-12/STM-4 port transmits a Line AIS (MS-AIS) signal. The received signal is ignored. Bring the SONET controller back up with the no shutdown controller command. Step 2  framing {sonet | sdh} Example: Router(config-controller)# framing sdh Specifies SONET or SDH framing type. The default is SONET framing. Step 3  clock source {internal | line} Example: Router(config-controller)# clock source line Sets the clock source for the 1-Port CHOC-12 ISE line card. Typically, an 1-Port CHOC-12 ISE line card is connected to a SONET or SDH add/drop multiplexer (ADM). In this application, Cisco recommends using the default setting of clock source line, because: The clock source used by the SONET/SDH network is of higher accuracy than the internal clock source on the 1-Port CHOC-12 ISE line card. The SONET/SDH network is designed for optimal operation in synchronous mode, where all clocks used in the network can be traced to a single high-accuracy clock source. Using the internal clock on the line card port introduces an independent clock source into the network, and may cause synchronization-related anomalies to be detected by the SONET/SDH network elements. When configured for line clocking, the 1-Port CHOC-12 ISE line card port will automatically default to internal clocking if the line clock source is considered unusable for any of the following reasons: The port detects a Loss of Signal (SLOS) defect. The port detects a Loss of Frame (LOF) defect. The port detects a Section (RS) Loss of Frame (SLOF) defect. The port detects a Line (MS) Alarm Indication Signal (LAIS) defect. The port receives the "Do not use for synchronization" code in byte S1 of the Line (MS) overhead. The port has been put into the local loopback mode through the use of the loopback local controller command. When the loopback is cleared, the port reverts to using the line clock source. Note    The OC-12/STM-4 port always sends the "Do not use for synchronization" code in byte S1 of the Line (MS) overhead toward the directly connected ADM.   Step 4  description string Example: Router(config-controller)# description E1T1Card (Optional). You can add a description of up to 80 characters about a controller to help you remember what is attached to it. The description is intended solely as a comment about the use of the controller. The description will appear in the output of the following commands: show configuration show system running config show controllers. Step 5  report {all | event} Example: Router(config-controller)# report {all | event} (Optional). Enable reporting of selected alarm and signal events. The following alarm and signal events are enabled and reported by default: sf-ber slos slof b1-tca lais b2-tca Enable reporting for the alarm and signal events individually, or use the all keyword to enable all of the available alarm and signal events. Step 6  threshold type value Example: Router(config-controller)# threshold all (Optional). Set threshold values for the BER Threshold Crossing Alarms. For further information, see the document Bit Error Rate Testing on Channelized Line Cards in Cisco 12000 Series Internet Routers at the following URL: http://www.cisco.com/univercd/cc/td/doc/product/software /ios120/120newft/120limit/120s/120s21/bert.htm Step 7  overhead s1s0 number Example: Router(config-controller)# overhead s1s0 2  (Optional). Sets S1 and S0 overhead bits. Legal values are 0 to 3. The default is 0 for SONET and 2 for SDH framing. The values for these bits are set automatically with frame type. Change the values only to ensure operability with older or nonstandard equipment, or to ensure operability if the bit values in the network are other than the defaults. For example, SDH equipment in Australia might use 1 as the SDH value. The S1 and S0 bits are located in the H1 Administrative Unit (AU) pointer byte, bit locations 5 and 6. Step 8  overhead j0 number Example: Router(config-controller)# overhead j0 82  (Optional). Sets identifier of transmitting equipment (0 to 255). Default is 1. Section trace is a maintenance feature of SONET. One byte (J0) of the Section overhead associated with each SONET frame is used to carry information identifying the transmitting equipment. Step 9  overhead c2 number Example: Router(config-controller)# au-4 1 overhead c2 or Router(config-controller)# au-3 3 Router(config-ctrlr-au3)# overhead c2 98 or Router(config-controller)# sts-1 Router(config-ctrlr-sts1)# overhead c2 98 (Optional). Legal values are 0 to 255. Defaults are as follows: 02 for vt15, c11, and c12 04 for ct3 The Signal Label field is configured at the path level configuration mode. The Path Signal Label field occupies one byte (C2) of the SONET STS Path overhead, and the SDH High Order Path overhead. This byte indicates the type of contents carried in the SONET Synchronous Payload Envelope (SPE), or SDH High Order Virtual Container (HOVC). Setting the Path Signal Label affects both the Transmitted (sent) value and the Expected value of the C2 overhead byte. Step 10  overhead j1 length [16 | 64] overhead j1 message Example: J1 configuration for SDH AU-4 mode Router(config-controller)# au-4 1 overhead j1 length 16 Router(config-controller)# au-4 1 overhead j1 message metro_SF Example: J1 configuration for SDH AU-3 mode Router(config-controller)# au-3 3 Router(config-ctrlr-au3)# overhead j1 length 16 Router(config-ctrlr-au3)# overhead j1 message metro_LA Example: J1 Configuration for SONET STS-1 mode Router(config-ctrlr-sts1)# overhead j1 length 64 Router(config-ctrlr-sts1)# overhead j1 message metro_washington gsr_0057/4/3 (Optional). The Path Trace identifier consists of two configuration settings, the message length and the message text. The default message length is 16 for SDH framing, and 64 for SONET framing. If you select a message length of 16, the actual message length can be up to 15 characters. An additional byte, prepended to the message, contains the result of a CRC7 calculated on the message. If the actual message text is fewer than 15 characters, the message text is padded to its full length with NULL characters. If you select a message length of 64 and the actual message text is fewer than 62 characters, the message text is padded with NULL characters. The last two byte positions, 63 and 64, are always CR/LF (0x0D/0x0A). The STS/High Order Path Trace Identifier (J1) is a maintenance feature of SONETand SDH. One byte (J1) of the Path overhead associated with each path in the SONET/SDH frame is used to carry information identifying the originating Path Terminating Equipment (PTE). In SDH with AU-4 mapping, the Path Trace identifier is configured at the controller level. In SDH with AU-3 mapping or in SONET framing, the Path Trace identifier is configured at the path level.

Configuring an STS-1 Mode of Operation with SONET Framing

Under SONET framing, each of the STS-1 paths can be configured to carry a set of T1s mapped into either a VT1.5 signal or a DS3 signal. The DS3 signal itself carries a set of T1s (thus becoming a channelized T3, or CT3).

Summary Steps

1. controller sonet slot/port

2. framing sonet {sonet | sdh}

3. sts-1 number

4. mode {vt-15 | ct3}

Detailed Steps

Configuring T3 Links with SONET Framing

You can configure T3 links from the STS-1 path configuration level when ct3 is the STS-1 mode of operation.

Summary Steps

1. t3 framing [auto-detect | c-bit | m23

2. t3 clock source [internal | line]

3. t3 equipment {customer | network } loopback

Detailed Steps

Command  Purpose  Step 1  t3 framing [auto-detect | c-bit | m23] Example: Router(config-crtlr-sts1)# t3 framing m23 Specifies the framing type for the T3 link. Default is auto-detect. Note    The M23 framing type might be referred to as M13 in other technical literature and on test equipment. Auto-detect identifies the framing type the line card is receiving from the far end and then transmits with that same framing type. Step 2  t3 clock source [internal | line] Example: Router(config-crtlr-sts1)# t3 clock source line Sets the clock source for the selected T3 link. The default is internal. Note    On a T3 circuit, at least one end must provide the clock source (by using the internal clock source). The other end of the T3 circuit can use either line or internal as the clock source. Step 3  t3 equipment {customer | network } loopback Example: Router(config-ctrlr-sts1)# t3 equipment customer loopback The default is t3 equipment customer loopback. The equipment customer loopback command enables the line card to respond to remote T3 link loopback commands from the remote T3 equipment . The equipment network loopback command enables the line card to ignore remote T3 link loopback commands,

Configuring T1 Lines Under SONET Framing

With SONET framing, you can configure T1s in vt-15 or in ct3 mode.

Procedures and examples for configuring T1 channel-groups on the 1-Port CHOC-12 ISE line card are presented in the following sections:

Configuring a T1 in SONET Virtural Tributary Mode

Summary Steps:

1. vtg vtg-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}]

2. vtg vtg-number t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]}

3. vtg vtg-number t1 t1-line-number clock source {internal | line}

Command  Purpose  Step 1  vtg vtg-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] Example: Router(config-crtlr-sts1)# vtg 1 t1 1 channel-group 15 timeslots 1-5, 20-23 Creates a logical channel group for a T1 line from the STS-1 configuration level. In vt-15 mode, the range of the t1-line-number parameter is 1 to 5. The channel-group keyword defines a logical channel group to identify the set of timeslots allocated to this n x DS0 channel in the channelized T1 line (where n ranges from 1 to 24 DS0 timeslots). The timeslots keyword creates the combination of subranges . The default speed for DS0 timeslots is 64 Kbps. In this example, the first T1 line is assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23. The DS0 speed per timeslot is 64 Kbps. Step 2  vtg vtg-number t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]} Example: Router(config-crtlr-sts1)# vtg 1 t1 1 framing esf Specifies the T1 framing format. The default framing format is Extended Super Frame (ESF). Super Frame (SF) format offers the hdlc-idle option, which can be set to use either 0x7E or 0xFF as the HDLC idle pattern. Note    When you select SF framing, consider using the no t1-line-number yellow detection command to turn off yellow alarm detection, because the yellow alarm can be incorrectly detected with SF framing.   Step 3  vtg vtg-number t1 t1-line-number clock source {internal | line} Example: Router(config-crtlr-sts1)# vtg 1 t1 1 clock source line Sets the internal or line (network) clock source. The value of n depends on the mode of operation selected: In ct3 mode, n = 28; in vt-15 mode, n = 4. Defines the clock source for the T1 line. The default clock source is internal. Defines the clock source for the T1 line. The default clock source is internal.

Detailed Steps

Configuring a T1 in SONET CT3 Mode

The CT3 mode is the default mode for STS-1 with SONET framing

Summary Steps

1. t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}]

2. t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]}

3. t1 t 1-line-number clock source {internal | line}

Detailed Steps

Command  Purpose  Step 1  t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] Example: Router(config-ctrlr-sts1)# t1 1 channel-group 15 timeslots 1-5, 20-23  Configured in STS-1 configuration mode, creates a logical channel group on a T1 line. Default speed is 64 kbps. The example shows the configuring a logical channel group in ct3 mode. The first T1 line is assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23. Step 2  t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]} Example: Router(config-crtlr-sts1)# t1 1 framing sf Specifies the T1 framing format. Default is Extended Super Frame (ESF). Super Frame (SF) format offers the hdlc-idle option, which can be set to use either 0x7E or 0xFF as the HDLC idle pattern. Note    When you select SF framing, consider using the no t1-line-number yellow detection command to turn off yellow alarm detection, because the yellow alarm can be incorrectly detected with SF framing.   Step 3  t1 t1-line-number clock source {internal | line} Example: Router(config-crtlr-sts1)# t1 1 clock source line Sets the internal or line (network) clock source. Default is internal.

After a T1 channel group is configured, it appears to the Cisco IOS software as a serial interface; therefore, all the configuration commands for a serial interface are available, but not all commands are applicable to the T1 channel group.

All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured T1 channel group. Be sure that you are in serial interface configuration mode when you set the encapsulation format.

All the switching types that are applicable to a serial interface are also applicable to the configured T1 channel group.

Note   When a timeslot on a tributary is disabled, an idle pattern is transmitted on that slot. The idle pattern number STS-1 configuration command changes the idle pattern globally for all the serial interfaces on all 12 STS-1 paths. Under most operating circumstances there is no need to change the default values of the idle pattern STS-1 configuration command.

Removing a Logical Channel Group from a T1 Line

You can remove a logical channel group from a T1 line (or a T1 line) with the no form of the t1 t1-line-number channel-group channel-group-number STS-1 path configuration command, using the extended command prefix that is appropriate to your channelized configuration.

To configure a T1 line, you must enter controller configuration mode and specify the line card slot and port. The following examples show a SONET controller in slot 6 and port 0.

Using the ping Command to Verify Network Connectivity

Using the ping command, you can verify that an interface port is functioning properly. The ping command sends echo request packets out to a remote device at an IP address that you specify. After sending an echo request, the system waits a specified time for the remote device to reply. Each echo reply is displayed as an exclamation point (!) on the console terminal; each request that is not returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the messages [timed out] or [failed] indicate a bad connection.

Following is an example of a successful ping command to a remote server with the address 10.0.0.10:

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), then repeat the ping command.

Proceed to the next section, "Using T1 Interface Loopback Modes," to finish checking network connectivity.

Using T1 Interface Loopback Modes

If you have difficulty with the 1-Port CHOC-12 ISE line card configuration or installation, you can troubleshoot the problem using the t1 t1-line-number loopback [local | network {line | payload} | remote {line fdl {ansi | bellcore} | payload [fdl] [ansi]}] path configuration command, using the extended command prefix that is appropriate to your channelized configuration. In vt-15 mode, t1-line-number is a number in the range from 1 to 4; in ct3 mode, t1-line-number is a number in the range from 1 to 28. Table 2 describes the supported loopback modes within the syntax of this command.

Note   fdl loopback commands are available only for T1 links configured for ESF framing.

Table 2 provides explanations of specific T1 loopback modes.

The following examples show how to specify loopbacks for a T1 line in vt-15 mode:

Enabling Remote Performance Reports

To enable and disable 1-second transmissions of performance reports through the Facility Data Link (FDL), use the t1 t1-line-number fdl ansi configuration command, using the extended command prefix that is appropriate to your channelized configuration. The command must be used on both ends of the connection. In this command, t1-line-number is a number in the range from 1 to 4 in vt-15 mode, and 1 to 28 in ct3 mode.

The following example shows how to enable performance reports for a T1 line in vt-15 mode:

Note   You can use this command only when the T1 framing is ESF. Use the no form of the command to disable remote performance reports. The 1-Port CHOC-12 ISE line card supports the reporting of controlled slip seconds (CSS). Controlled slip seconds are reported from the far end only when a network payload loopback is set.

Note   If you do not first enable remote performance data with the t1 t1-line-number fdl ansi command, the following message is displayed: T1 1 - Remote Performance Data (Not available)

Configuring a BER Test on a T1 Line

For explanations on how to send, display and terminate a BER test on a T1 line, see the document, Bit Error Rate Testing on Channelized Line Cards in Cisco 12000 Series Internet Routers at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s21/bert.htm

Configuring Attributes Under SDH Framing

Procedures and examples for configuring attributes under SDH framing are presented in the following sections:

Configuring the Mapping of an Administrative Unit Group (AUG)

In SDH, there are two possible mapping/multiplexing schemes for most payload types: ANSI and ETSI.

In ANSI mapping, the Low Order payloads are aggregated into a VC-3 High Order Path. An AU pointer is added to the VC-3 to create an AU-3 (Administrative Unit type 3). Three such AU-3s are then synchronously multiplexed into an AUG (AU group). The multiplexing scheme is as follows:

VC-3 to AU-3 (x3) to AUG to STM-1

SDH ANSI mapping is very similar to the SONET frame structure.

In ETSI mapping, the Low Order payloads are aggregated into a VC-4 High Order Path. An AU pointer is added to the VC-4 to create an AU-4 (Administrative Unit type 4). One AU-4 is "multiplexed" into an AUG (AU group), which is to say, the AUG is, in fact, equivalent to an AU-4. The multiplexing scheme is as follows:

TUG-3 (x3) to VC-4 to AU-4 (x1) to STM-1

To specify the AUG mapping, use the controller command aug mapping {au-3 | au-4}. The default is operation using AU-4 mapping.

Note   This command is available only when SDH framing is configured.

The example that follows selects AU-3 mapping for port 1 of the 1-Port CHOC-12 ISE line card in slot 2 of a Cisco 12000 Series Router:

Configuring a TUG-3 or AU-3

Under SDH framing with AUG mapping set to AU-4, the VC-4 High Order Path comprises three TUG-3s. Each TUG-3 can be configured to carry up to 21 E1s, mapped into VC-12s. The mode of operation of a TUG-3 is not configurable, and defaults to mode c-12.

Under SDH framing with AUG mapping set to AU-3, each VC-3 High Order Path can be configured to carry up to 28 T-1s, mapped into VC-11s. The mode of operation of an AU-3 is not configurable, and defaults to mode c-11.

Note   When configured for SDH framing, the 1-Port CHOC-12 ISE line card supports channelization to E1s when the AUG mapping is set to AU-4, and channelization to T-1s when the AUG mapping is set to AU-3. Different combinations of payload types and AUG mappings are not supported.

Entering TUG-3 Configuration Mode

To configure a TUG-3, use the au-4 au-4-number tug-3 tug-3-number controller configuration command to enter TUG-3 configuration mode, which is indicated by a change in the command prompt. Table 4 describes the syntax of this command.

In the example that follows, the second TUG-3 of the AU-4 of the 1-Port CHOC-12 ISE line card in slot 4 of a Cisco 12000 Series Router is selected for configuration:

Entering AU-3 Configuration Mode

To configure an AU-3, use the au-3 au-3-number controller configuration command to enter AU-3 configuration mode, which is indicated by a change in the command prompt. au-3-number is a number in the range from 1 to 3.

In the example that follows, the second AU-3 the 1-Port CHOC-12 ISE line card in slot 4 of a Cisco 12000 Series Router is selected for configuration:

Configuring T1 Lines Under SDH Framing

Procedures and examples for configuring T1 channel-groups on the 1-Port CHOC-12 ISE line card are presented in the following sections:

Using Extended Configuration Commands for T1 Lines in AU-3 Configuration Mode

In AU-3 configuration mode, you must add the tug-2 tug-2-number modal prefix to the commands used to configure T1 line attributes, where tug-2-number is a number in the range from 1 to 7. For example, the AU-3 configuration command to configure the T1 framing takes the form:

tug-2 tug-2-number t1 t1-line-number framing {esf | sf}

Similarly, when you want to negate or reset the effects of a command by using the no form of the command, you must apply the no form of the extended command.

Creating a Logical Channel Group on a T1 Line

You can create a logical channel group on a T1 line using the tug-2 tug-2-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] AU-3 configuration command. Table 4 describes the syntax of this command.

To configure a T1 line, you must enter SONET controller configuration mode and specify the line card slot and port, and then enter AU-3 configuration mode.

The following example shows the process of configuring a logical channel group in c-11 mode. The first T1 line in the fourth TUG-2 group is assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23:

Note   After a T1 channel group is configured, it appears to the Cisco IOS software as a serial interface; therefore, all the configuration commands for a serial interface are available, but not all commands are applicable to the T1 channel group. All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured T1 channel group. Be sure that you are in serial interface configuration mode when you set the encapsulation format. All the switching types that are applicable to a serial interface are also applicable to the configured T1 channel group.

Removing a Logical Channel Group from a T1 Line

You can remove a logical channel group from a T1 line (or a T1 line) with the no form of the tug-2 tug-2-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] AU-3 configuration command.

The following example shows the process of removing a logical channel group in c-11 mode, and uses port 0 of the 1-Port CHOC-12 ISE line card in slot 6 of a Cisco 12000 Series Router. The first T1 line in the fourth TUG-2 group is being removed from logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23:

Setting the Framing Format on a T1 Line

You can specify the T1 framing format using the tug-2 tug-2-number t1 t1-line-number framing {esf | sf} AU-3 configuration command. Table 5 describes the syntax of this command.

To configure a T1 line, you must enter controller configuration mode and specify the line card slot and port. The following examples use port 0 of a SONET controller in slot 6.

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Note    When you select SF framing, consider using the no t1-line-number yellow detection command to turn off yellow alarm detection, because the yellow alarm can be incorrectly detected with SF framing. You can use the [no] t1 t1-line-number yellow {detection | generation} command (where t1-line-number is 1 to 28) to turn the detection or generation of a yellow alarm on and off.

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Setting the Clock Source on a T1 Line

You can set the internal or line (network) clock source for a T1 line with the tug-2 tug-2-number t1 t1-line-number clock source {internal | line} AU-3 configuration command. Table 6 describes the syntax of this command.

Note   On a T1 circuit, one end must provide the clock source by using the internal clock source. The other end of the circuit can use either line or internal as the clock source.

Using the ping Command to Verify Network Connectivity

Following is an example of a successful ping command to a remote server with the address 10.0.0.10:

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), then repeat the ping command.

Proceed to the next section, "Using T1 Interface Loopback Modes," to finish checking network connectivity.

Using T1 Interface Loopback Modes

If you have difficulty with the 1-Port CHOC-12 ISE line card configuration or installation, you can troubleshoot the problem using the tug-2 tug-2-number t1 t1-line-number loopback [local | network {line | payload} | remote {line fdl {ansi | bellcore} | payload [fdl] [ansi]}] AU-3 configuration command. In c-11 mode, t1-line-number is a number in the range from 1 to 4. Table 7 describes the supported loopback modes within the syntax of this command.

Note   fdl loopback commands are available only for T1 links configured for ESF framing.

Table 7 provides explanations of specific T1 loopback modes.

The following examples set loopbacks for a T1 line in c-11 mode:

Enabling Remote Performance Reports

To enable and disable 1-second transmissions of performance reports through the Facility Data Link (FDL), use the tug-2 tug-2-number t1 t1-line-number fdl ansi AU-3 configuration command. The command must be used on both ends of the connection. In this command, t1-line-number is a number in the range from 1 to 4 in c-11 mode.

The following example shows how to enable performance reports for a T1 line in c-11 mode:

You can use this command only when the T1 framing is ESF. Use the no form of the command to disable remote performance reports. The 1-Port CHOC-12 ISE line card supports the reporting of controlled slip seconds (CSS). Controlled slip seconds are reported from the far end only when a network payload loopback is set.

Note   If you do not first enable remote performance data with the t1 t1-line-number fdl ansi command, the following message is displayed: T1 1 - Remote Performance Data (Not available)

Configuring a BER Test on a T1 Line under SDH Framing with AU-3 AUG Mapping

For explanations on how to send, display and terminate a BER test on a T1 line, see the document,
Bit Error Rate Testing on Channelized Line Cards in Cisco 12000 Series Internet Routers at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s21/bert.htm

Configuring E1 Lines under SDH Framing with AU-4 AUG Mapping

Procedures and examples for configuring E1 channel-groups on the 1-Port CHOC-12 ISE line card are presented in the following sections:

Creating a Logical Channel Group on a E1 Line under SDH Framing with AU-4 AUG Mapping

E1 channels are supported under SDH framing, with AUG mapping set to AU-4. Configuration of the 63 E1s is done per TUG-3 (see the "Entering TUG-3 Configuration Mode" section). Each TUG-3 comprises 7 TUG-2s. Each TUG-2 can be configured to carry up to 3 E1s mapped into TU-12s.

To configure a logical channel group on an E1 line, use the tug-2 tug-2-number e1 e1-line-number channel-group channel-group-number timeslots list-of-timeslots TUG-3 configuration command. Table 8 describes the syntax of this channel group command:

To configure an E1 line, you must enter SONET controller configuration mode and specify the line card slot and port, and then enter the command mode appropriate to the selected framing type and mode of operation for the for the TUG-3 of an AU-4. The following example shows the first E1 line in the fourth TUG-2 group being assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23:

Note   After an E1 channel group is configured, it appears to the Cisco IOS software as a serial interface; therefore, all the configuration commands for a serial interface are available, but not all commands are applicable to the E1 channel group. All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured E1 channel group. Be sure that you are in serial interface configuration mode when you set the encapsulation format. All the switching types that are applicable to a serial interface are also applicable to the configured E1 channel group.

Removing a Logical Channel Group from an E1 Line under SDH Framing with AU-4 AUG Mapping

You can remove a logical channel group from an E1 line with the no tug-2 tug-2-number e1 e1-line-number channel-group channel-group-number TUG-3 configuration command, where:

To configure an E1 line, you must enter SONET controller configuration mode and specify the line card slot and port, and then enter the command mode appropriate to the selected framing type and mode of operation for the for the TUG-3 of an AU-4. The following example shows a SONET controller in slot 6 and port 0.

The following example removes logical channel group 10 from channelized E1 line 1 of TUG-2 number 4 in TUG-3 number 2.

Creating an Unframed Logical Channel Group on an E1 Line

You can configure any of the E1 lines as unframed E1 data lines. An unframed E1 line contains no framing byte in timeslot 0. Unframed E1s are not divided into timeslots, thus allowing the full 2048 kbps bandwidth to be allocated to user data. Having no framing byte nor CRC-4 error detection, unframed E1s offer fewer performance monitoring and alarm detection capabilities than framed E1s.

To configure an unframed E1 line, use the tug-2 tug-2-number e1 e1-line-number unframed TUG-3 configuration command, where:

To configure an E1 line, you must enter SONET controller configuration mode and specify the line card slot and port, and then enter the command mode appropriate to the selected framing type and mode of operation for the for the TUG-3 of an AU-4. The following example shows the first E1 line in the fourth TUG-2 group being configured as an unframed E1:

Note   After an unframed E1 logical channel group is configured, it appears to the Cisco IOS software as a serial interface with channel group number zero. The configuration commands in the previous example will create a serial interface with the following address: interface serial 6/0.1/2/4/1:0 (see Table 10 for interface naming details).

Setting the Framing Format on an E1 Line

You can specify the E1 framing format using the tug-2 tug-2-number e1 e1-line-number framing {crc4 | no-crc4} TUG-3 configuration command, where:

To configure an E1 line, you must enter SONET controller configuration mode and specify the line card slot and port, and then enter the command mode appropriate to the selected framing type and mode of operation for the for the TUG-3 of an AU-4. The following examples use port 0 of a SONET controller in slot 6.

Setting the Clock Source on an E1 Line

To specify where the clock source is obtained for an E1 line, use the tug-2 tug-2-number e1 e1-line-number clock source {internal | line} TUG-3 configuration command, where:

Setting the National Bits on an E1 Line

To configure the national reserve bit pattern for an E1 line, use the tug-2 tug-2-number e1 e1-line-number national bits pattern TUG-3 configuration command, where:

The following example sets the national bit pattern to 0x0 on the first E1 line in the fourth TUG-2.

Using the ping Command to Verify Network Connectivity

Following is an example of a successful ping command to a remote server with the address 10.0.0.10:

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), then repeat the ping command.

Proceed to the next section, "Using E1 Interface Loopback Modes," to finish checking network connectivity.

Using E1 Interface Loopback Modes

If you have difficulty with the 1-Port CHOC-12 ISE line card configuration or installation, you can troubleshoot the problem using the supported E1 interface loopback modes:

To set one of these loopback modes, use the tug-2 tug-2-number e1 e1-line-number loopback {local | network {line | payload}} TUG-3 configuration command, where:

To disable one of these loopback modes, use the no tug-2 tug-2-number e1 e1-line-number loopback {local | network {line | payload}} TUG-3 configuration command.

Table 9 describes the supported E1 interface loopback modes.

To set a local loopback on an E1 line, use the loopback local TUG-3 configuration command.

To set a network line loopback on an E1 line, use the loopback network line TUG-3 configuration command.

To set a network payload loopback on an E1 line, use the loopback network payload TUG-3 configuration command.

Configuring a BER Test on an E1 Line

For explanations on how to send, display and terminate a BER test on a E-1 line, see the document, Bit Error Rate Testing on Channelized Line Cards in Cisco 12000 Series Internet Routers at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s21/bert.htm

Configuring the Serial Interfaces

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 configuration options available, refer to the appropriate software publications listed in the "Related Documents" section.

A serial interface is automatically created for each T-1and E1 configured. Table 10 lists the command syntax for the selected framing.

Follow these steps to configure the 1-Port CHOC-12 ISE line card interface, beginning in privileged EXEC mode:

Step 2   Specify the 1-Port CHOC-12 ISE line card interface by entering the interface serial global configuration command in the appropriate format (see Table 10).

or

or

or

The prompt changes to interface configuration mode.

Step 3   Use the ip address interface configuration command to specify an interface by an IP address and subnet mask:

Step 4   Add any additional configuration commands required to enable routing protocols and set the interface characteristics.

Step 5   To change the shutdown state to up and enable the interface, use the no shutdown interface command:

Step 6   Repeat Step 2 through Step 5 to configure additional interfaces, as required.

Step 7   Enter exit to exit configuration mode:

Step 8   Write the new configuration to nonvolatile random access memory (NVRAM) by using the copy running-config startup-config command:

Using clear Commands on Serial Interfaces

To reset the hardware logic for a serial interface, use the clear interface serial slot/port.path:channel-group-number EXEC command, where:

The following example clears serial interface 3/0.1/1/1:1, which is configured in the context of SONET framing in vt-15 mode. The number sequence .1/1/1/:1 corresponds to the sts-1-number/vtg-number/t1-line-number:channel-group number sequence.

Note   As long as the serial interface is available, you can enter this command immediately after using the enable command to enter privileged EXEC mode.

To initialize the counters for a serial interface, use the clear counters serial slot/port.path:channel-group-number EXEC command, where:

The following example clears the counters for serial interface 3/0.1/1/1:1, which is configured in the context of SONET framing in vt-15 mode. The number sequence .1/1/1:1 corresponds to the sts-1-number/vtg-number/t1-line-number:channel-group-number sequence.

Note   As long as the serial interface is available, you can enter this command immediately after using the enable command to enter privileged EXEC mode.

Configuring Automatic Protection Switch

On the 1-Port CHOC-12 ISE line card, you configure APS at the SONET controller level, and not at the interface level as in Packet-Over-Sonet.

The minimum configuration tasks to complete for configuring APS are as follows:

Use the aps working and the aps protect controller configuration commands to specify the working and protect channels.

Other APS features include the following:

Use the show aps, show controllers sonet, and show interfaces EXEC commands to monitor APS configurations.

For procedures on how to configure automatic protection switching on the 1-Port CHOC-12 ISE line card, see the document, Automatic Protection Switching of Packet-over-SONET Circuits, at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/gsr/posapsgs.htm

Two SONET connections are required to utilize APS and, in a Telco environment, the SONET circuits must be provisioned for APS. At the time of provisioning, the operation (ie. 1+1), mode (ie. bidirectional) and revert operation (that is, no revert) need to be specified. If the SONET connections are homed on two separate routers (the normal configuration), then a communications channel between the two routers (NOT utilizing the working and protect SONET circuits) needs to be set up for APS communication.

In enabling APS operation, it is recommended to configure the working channel first. Normal operation with 1+1 operation is to configure it as working channel 1.

Configuration on the router hosting the working channel:

Configuration on the router hosting the protect channel:

How to Configure Layer 2 Features

This section contains the following procedures:

Configuring Distributed Multilink Point-to-Point Protocol

Configuring Multilink Frame-Relay

Configuring Distributed Multilink Point-to-Point Protocol

Configuring Distributed Multilink Point-to-Point Protocol (MLPPP) is presented in the following sections:

MLPPP allows you to increase the bandwidth of your network links beyond that of a single T1/E1 line without having to purchase a T-3/E3 line. You can combine T1/E1 lines in a 1-Port CHOC-12 ISE line card on a Cisco 12000 Series Router into a bundle that has the combined bandwidth of multiple T1/E1 lines. This is done by using an MLPPP link. You choose the number of bundles and the number of T1/E1 lines in each bundle.

An individual MLPPP bundle can span across multiple T1/E1s on the same line card, but bundles cannot span across multiple line cards.

Note   Distributed Multilink PPP is not supported across multiple Cisco 12000 series line cards.

A bundle can be composed of the following:

For additional information, refer to the document, Configuring Media-Independent PPP and Multilink PPP at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/dial_c/dcppp.htm.

Create a Multilink Bundle

A multilink bundle consists of a maximum of 8 T1/E1s. To create a multilink bundle, use the following commands beginning in global configuration mode:

Step 2   Assign an IP address to the multilink interface:

Step 3   Enable PPP encapsulation:

Step 4   Enable Multilink PPP:

Step 5   Assign the multilink interface to a multilink bundle:

Step 6   Optional. Enable Challenge Handshake Authentication Protocol (CHAP) authentication:

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Note    If more than one bundle is configured on the Cisco 12000 series Internet Router, you must add the ppp chap hostname group command to both the bundle and link configurations.

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Assign a Serial Interface to a Multilink Bundle

To assign a serial interface to a multilink bundle, use the following commands in interface configuration mode:

Step 2   Remove any specified IP address.

Step 3   Set the frequency of keepalive packets.

Step 4   Enable PPP encapsulation.

Step 5   Enable Multilink PPP.

Step 6   Disable CDP on the serial link.

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Note    CDP should be disabled on serial links belonging to an MLPPP bundle because CDP packets cannot be encapsulated on these links. CDP can be enabled on the MLPPP bundle, but not on individual serial links.

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Step 7   Assign the interface to a multilink bundle.

Step 8   Optional. Enable Challenge Handshake Authentication Protocol (CHAP) authentication.

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Note    If more than one bundle is configured on the Cisco 12000 series Internet Router, you must add the ppp chap hostname group command to both the bundle and link configurations.

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Disable PPP Multilink Fragmentation

By default, PPP multilink fragmentation is enabled. To disable PPP multilink fragmentation, use the following command in interface configuration mode:

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Note    Enabling fragmentation reduces the delay latency among bundle links, but adds some load to the CPU. Disabling fragmentation can result in better throughput. If your data traffic is consistently of a similar size, Cisco recommends that you disable fragmentation. In this case, the benefits of fragmentation might be outweighed by the added load on the CPU.

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Configuring Multilink Frame-Relay

For additional configuration information on Multilink Frame-Relay and the Cisco 12000 Series Router, see the document, Multilink Frame Relay (FRF.16) at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s17/17s _mfr.htm

Create an MFR Bundle

A multilink bundle consists of a maximum of 8 T-1s or E1s. To create a multilink bundle, complete the following steps:

Step 2   Assign an IP address to the MFR interface:

Step 3   Assign a bundle ID

Step 4   Remaining frame-relay configuration is the same as for non-multilink interfaces

Assign an Interface to an MFR Bundle

To assign an interface to a multilink bundle, use the following commands in interface configuration mode:

Step 2   Associate a serial interface with the MFR bundle:

Link Fragmentation Reassembly Configuration

Link Fragmentation Reassembly (LFI) allows the router to send large, low priority packets and small, high priority packets on the same DLCI while minimizing the latency of high priority packets. The low priority packets are fragmented and high-priority packets are inserted between the fragments of the low priority packets. The configuration must include the following steps:

Step 2   Mark high priority traffic

Step 3   Specify the fragmentation and policy:

Step 4   Create frame-relay interface/sub-interface:

How to Configure Layer 3 Features

The 1-Port CHOC-12 ISE line card supports all Cisco 12000 Series Router Internet Service Engine 3 (ISE 3) software features. Additional information can be found in the following documents:

Cross-Platform Release Notes for Cisco IOS Release 12.0 S, Part 2: New Features and Important Notes
/en/US/docs/ios/12_0s/release/ntes/120SNEWF.html#32 390

Cisco IOS Release 12.0S Features for Cisco 12000 Series Internet Router
http://www.cisco.com/univercd/cc/td/doc/product/core/cis12000/12_0s/index.htm

Verifying and Monitoring Configurations with Show Commands

After installing the 1-Port CHOC-12 ISE line card, use show commands to display the status of the SONET controller, T1 channel-groups, and the 1-Port CHOC-12 ISE line card serial interfaces. Following are descriptions and examples of the show commands you can use to check the configuration. Descriptions are limited to fields that are relevant for verifying the configuration of the 1-Port CHOC-12 ISE line card.

Discovering the Slot Number of the Line Cards—show gsr

To ascertain the correct slot number with which to configure the SONET controller, use the show gsr EXEC command. The following example indicates that the 1-Port CHOC-12 ISE line card is in slot 2:

Discovering the Version of the Current Software and Hardware—show version

The show version command displays the configuration of the system hardware (the channel of each line card installed), the software release currently operating, the names and sources of configuration files, and the boot images. The following example lists the 1-Port CHOC-12 ISE line card interface as an active line card.

Discovering Current Status of the SONET Controller—show controllers sonet

To display information about the SONET port, including information on all of the configured channels, use the following form of the show controllers sonet command:

show controllers sonet slot/port [brief | tabular]

When framing is SDH and AUG mapping is AU-4, the form of the show controllers command is as follows:

show controllers sonet slot/port.au-4-number/tug-3-number/tug-2-number/e1-line-number [brief | tabular]

When framing is SDH and AUG mapping is au-3, the form of the show controllers command is as follows:

show controllers sonet slot/port.au-3-number/tug-2-number/t1-number [brief | tabular]

When framing is SONET and the mode is ct3, the form of the show controllers command is as follows:

show controllers sonet slot/port.sts1-number/t1-number [brief | tabular]

When framing is SONET and the mode is vt-15, the form of the show controllers command is as follows:

show controllers sonet slot/port.sts1-number/vtg-number/t1-number [brief | tabular]

where:

(Additional display text is not shown.)

The show controllers sonet slot/port brief command shows limited information for a SONET port.

(Additional display text is not shown.)

By adding specific T1 or E1 line information to the preceding show controllers sonet slot/port brief command, you can show limited output for the specific line that you specify.

By adding specific T1 or E1 line information to the show controllers sonet slot/port tabular command, you can show output for the specific line that you specify in tabular format.

Discovering the Operational Status of Line Protocols on All Interfaces—show protocols

The show protocols EXEC command displays the protocols configured for the entire system and specific interfaces. If necessary, return to configuration mode to add or remove protocol routing on the system or specific interfaces.

Discovering Multilink Bundle and Group Status—show ppp multilink

Use the show ppp multilink command to display information about the newly created multilink bundle: