Cisco IGX 8400 Series Lines

Cisco IGX 8400 Series Lines
Functional Overview

IMA on the IGX

IGX Line Configuration

Setting Up a Line

IGX Line Management
IGX Line Troubleshooting
Switch Software Commands Related to Lines on the IGX
Where to Go Next

Cisco IGX 8400 Series Lines

This chapter provides information on configuring and managing lines.

For information about the BPX, see Chapter 1, "The BPX Switch: Functional Overview ," in the Cisco BPX 8600 Series Installation and Configuration guide.

Functional Overview

A line is an nxT1, nxE1, T1, T3, E1, E3, or OC3 circuit that carries data, voice, FR or ATM traffic between an IGX node and customer premises equipment (CPE). Each CPE is attached to a node through a circuit line.

See Table 5-1 for the input line formats supported by the IGX. For more information on these line formats, see "General IGX 8410 Switch Specifications" in the Cisco IGX 8400 Series Installation Guide. For more information on the features and types of service supported by each module, see Chapter 2, "Cisco IGX 8400 Series Cards"

Table 5-1 Input Line Formats Supported on the IGX

Type	Electrical Signal Format	Ones Density Enforcement	Multiplexing	Supported On
J1	Coded mark inversion (CMI)	-	31 channels at 64 kbps each	CVM
E1	Alternate mark inversion (AMI)	High density bipolar 3 (HDB3)	31 channels at 64 kbps each	CVM, UFM, UXM, UXM-E
T1	Alternate mark inversion (AMI)	Bipolar zero substitution (B8ZS)	24 channels at 64 kbps each	CVM, UFM, UXM, UXM-E
E3	Physical layer convergence protocol per AT&T publication; ITU I-361 with HEC for E3	HDB3	ITU-T G.804, G.832	UXM, UXM-E
T3	Physical layer convergence protocol per AT&T publication TA-TSY-00772 and 000773 for T3	B32ZS+	-	UXM, UXM-E

IMA on the IGX

IMA groups physical T1 or E1 lines to form logical lines with a higher data rate than a single T1 or E1 line. IMA on the IGX allows you to use the same configuration for all physical lines making up the IMA line group, and provides full support for individual physical line alarms and statistics.

IMA lines on the IGX support the following features:

Support for up to 8 T1/E1 lines.
Support for connections to any CPE that is ATM Forum IMA Standard Version 1.0 compliant.
Support for both IMA and non-IMA lines on the same card.
Support for addition or deletion of physical links while the IMA group remains active, as long as the following rules are followed:

A physical line cannot be deleted from a group if the resulting numbers of physical lines in the IMA group is less than the minimum retained links specified.
The primary link (the first physical line in the IMA group) can not be deleted dynamically.

Configurable differential delay for the IMA line.
Support for the common transmit clock (CTC) mode, meaning that all lines in the IMA use the same clock.
Configurable minimum retained links in the IMA group. For example, if 8 lines compose an IMA line, you specify how many active lines in the group can fail before the IMA line fails.

For information on the port speeds available for IMA line groups, see Table 5-2.

Table 5-2 Available Port Speeds for IMA Trunk or Line Groups

Interface	Port Speed (DS0)	Port Speed (cps)	Description
8xT1	T1/190	28697	LN.1-8
7xT1	T1/166	25056	LN.1-7
7xT1	T1/142	21433	LN.1-6
6xT1	T1/118	17811	LN.1-5
5xT1	T1/95	14339	LN.1-4
4xT1	T1/71	10716	LN.1-3
3xT1	T1/47	7094	LN.1-2
2xT1	T1/23	3471	LN.1
T1	T1/24	3622	Non-IMA
8xE1	E1/238	35924	LN.1-8
7xE1	E1/208	31396	LN.1-7
6xE1	E1/178	26867	LN.1-6
5xE1	E1/148	22339	LN.1-5
4xE1	E1/119	17962	LN.1-4
3xE1	E1/89	13433	LN.1-3
2xE1	E1/59	8905	LN.1-2
1xE1	E1/29	4377	LN.1
E1	E1/30	4528	Non-IMA

For more information on IMA and its applications to trunks, see Chapter 4, "Cisco IGX 8400 Series Trunks"

IGX Line Configuration

This section provides information on setting up and configuring a line on an IGX node.

Setting Up a Line

Before setting up a line, finish setting up the node(s) and network trunks. You must set up lines before provisioning voice, data, FR, or ATM services that use these lines. To set up a circuit line, use the following procedure:

Step 1 Confirm that the desired slot contains the appropriate front and back cards (see "Cisco IGX 8400 Series Cards").

Step 2 Activate a line in the desired slot with the switch software upln command.

Step 3 Configure the line with the switch software cnfln command.

IGX Line Management

Line management tasks are similar to node and trunk management tasks (see "Cisco IGX 8400 Series Nodes" and "Cisco IGX 8400 Series Trunks"). Changes to connections configured onto a line should be carefully planned to avoid over-provisioning a node or exceeding available bandwidth.

To monitor line operation, use the following switch software commands:

dsplns displays all lines on the node.
dspln or dsplncnf displays configuration details for a line.

To make changes to a line configuration, use the following switch software command:

cnfln reconfigures the line.

For information on troubleshooting a line, see the "IGX Line Troubleshooting" section.

IGX Line Troubleshooting

For information on troubleshooting a line on the IGX, see the "Troubleshooting an IGX Node" section in the Cisco IGX 8400 Series Installation Guide.

Switch Software Commands Related to Lines on the IGX

Full command descriptions for the switch software commands listed in Table 5-3 can be accessed at one of the following links:

For commands addad through cpytrkict, see "Alphabetical List of Commands addad through cpytrkict" in the Cisco WAN Switching Command Reference.
For commands dchst through window, see "Alphabetical List of Commands dchst through window" in the Cisco WAN Switching Command Reference.

Table 5-3 Switch Software Commands Related to Lines on the IGX

Command	Description
cnfln	Configures a line.
cnflnstats	Configures logical line statistics.
cnfphyslnstats	Configures physical line statistics.
cnfrsrc	Configures resources.
dnln	Deactivates (downs) a line.
dsplncnf	Displays the line configuration (same as dspln).
dsplns	Displays all lines on the node.
dsplnstathist	Displays line statistics history.
dspphyslnstatcnf	Displays the physical line statistics configuration.
dspphyslnstathist	Displays the physical line statistics history.
dspphyslns	Displays physical line status on the node.
prtlns	Prints line information for all lines on the node.
upln	Activates (ups) the line.

Where to Go Next

For information on IGX data service, refer to Chapter 6, "Cisco IGX 8400 Series Data Service"

For installation and basic configuration information, see the Cisco IGX 8400 Series Installation Guide, Chapter 1, "Cisco IGX 8400 Series Product Overview"

For more information on switch software commands, refer to the Cisco WAN Switching Command Reference, Chapter 1, "Command Line Fundamentals ."

Table of Contents

Cisco IGX 8400 Series Lines

Functional Overview

IMA on the IGX

IGX Line Configuration

Setting Up a Line

IGX Line Management

IGX Line Troubleshooting

Switch Software Commands Related to Lines on the IGX

Where to Go Next