Configuration Tasks

The following sections describe how to configure the layers on cOCx/STMx interfaces.

SONET/SDH Configuration Tasks

To configure SONET/SDH on a cOCx/STMx interface:

  1. Select an interface.
  2. Specify a clock source for the interface.
  3. Specify that the mode be SDH, or accept the default mode, SONET.
  4. (Optional) Assign a text description or an alias to the interface.
  5. (Optional) Disable processing of SNMP link status information for the section and line layers of the interface.
  6. Configure the path for the interface.
  7. (Optional—not recommended) Overwrite the automatic setting for the path signal label (C2) byte.
  8. (Optional) Enable processing of SNMP link status information for the path layer of the interface.
  9. (Optional) Configure the router to use remote defect indications (RDIs) at the path layer to determine the operational status of a path.
  10. (MPLS fast reroute over SONET/SDH interfaces) Specify the time duration after which the router sets an alarm when it records a defect at the path layer.
  11. (MPLS fast reroute over SONET/SDH interfaces) Specify the time duration after which the router sets an alarm when it records a defect at the line or section layer.
  12. Configure APS/MSP for the interface.

    For information about configuring APS/MSP, see Configuring APS/MSP in Configuring Unchannelized OCx/STMx Interfaces .

You must now configure the next layer on the interface: E1, T1, or E3. See T1/E1 Configuration Tasks or T3 Configuration Tasks.

clock source

controller sonet

description

path

path description

path overhead c2

path shutdown

path snmp trap link-status

path trigger alarm prdi

path trigger delay

sdh

snmp trap link-status

trigger delay

Configuring Higher Layers

You must now configure the next layer on the interface: E1, T1, or T3. See T1/E1 Configuration Tasks or T3 Configuration Tasks.

T1/E1 Configuration Tasks

Before you configure T1 or E1 on an interface, you must configure SONET or SDH. See SONET/SDH Configuration Tasks.

To configure a T1 or an E1 over SONET or SDH on a cOCx/STMx interface:

  1. Configure a tributary for the path.
  2. (Optional) Assign a text description or an alias to the interface.
  3. Configure one of the following:

For detailed examples, see Configuration Examples.

path ds1|e1

path ds1|e1 description

Configuring an Unframed E1 Line

Use the following command to configure an unframed E1 line.

path e1 unframed

Configuring T1 and E1 Lines

You can configure T1 and E1 interfaces on paths and tributaries. To do so, complete the following steps:

  1. Configure the clock source. You must coordinate this setting with the other end of the line to establish which end is the transmit (internal) clock and which is the receive (line) clock.
  2. (Optional) Configure the framing format.
  3. (Optional) Enable processing of SNMP link status information about an interface and its associated tributary.
  4. Configure the T1 or E1 line parameters.
  5. (Optional) Enable processing of SNMP link status information about a channel group.
  6. (Optional—T1 only) Configure FDL messages.
  7. (Optional) Assign a text description or an alias to the interface.

path ds1|e1 channel-group description

path ds1|e1 channel-group shutdown

path ds1|e1 channel-group snmp trap link-status

path ds1|e1 channel-group timeslots

path ds1|e1 clock source

path ds1|e1 framing

path ds1|e1 snmp trap link-status

Configuring T1 Interfaces to Send FDL Messages

You can configure a T1 interface to send FDL messages. To configure FDL:

  1. Specify a SONET interface.
    host1(config)#controller sonet 8/0
  2. Specify the standard for transmission of FDL messages on both ends of the T1 connection.
    host1(config-controll)#path 2 ds1 1/1/1 fdl ansi
  3. (Optional) Configure the interface to operate in an FDL carrier environment.
    host1(config-controll)#path 2 ds1 1/1/1 fdl carrier
  4. (Optional) Specify the FDL messages.
    host1(config-controll)#path 2 ds1 1/1/1 fdl string eic "ERX1410" host1(config-controll)#path 2 ds1 1/1/1 fdl string lic "Bldg 10" host1(config-controll)#path 2 ds1 1/1/1 fdl string fic "GY788" host1(config-controll)#path 2 ds1 1/1/1 fdl string unit 080001
  5. Enable transmission of FDL messages.
    host1(config-controll)#path 2 ds1 1/1/1 fdl transmit idle-signal

path ds1 fdl

path ds1 fdl carrier

path ds1 fdl string

path ds1 fdl transmit

Disabling Interfaces and Channel Groups

To disable interfaces and channel groups, use the following commands.

path ds1|e1 shutdown

Configuring Higher Layers

You must configure HDLC over the top layer of the T1/E1 interface. See HDLC Channel Configuration Tasks.

T3 Configuration Tasks

Before you configure T3 on an interface, you must configure SONET or SDH on the interface. See SONET/SDH Configuration Tasks.

To configure T3 over SONET or SDH on a cOCx/STMx interface, complete the following actions:

  1. Configure a T3 path over the SONET and SDH interfaces.
  2. Configure T3 line parameters (for both clear channel T3 lines and multiplexed T3 lines composed of fractional T1 lines).
  3. (Optional) Configure T1 or fractional T1 line parameters.

For detailed examples, see Configuration Examples.

path ds3

Configuring T3 Line Parameters

Complete the following steps to configure T3 line parameters. Configure these parameters for both clear channel and multiplexed T3 lines.

  1. Configure the clock source. You must coordinate this setting with the other end of the line to establish which end is the transmit (internal) clock and which is the receive (line) clock.
  2. (Optional) Assign a text description or an alias to the interface.
  3. (Optional) Configure the framing format.
  4. (Optional) Enable processing of SNMP link status information about an interface.
  5. (Optional) Configure MDL settings.
  6. (Optional) Configure T1 channels.

path ds3 clock source

path ds3 description

path ds3 framing

path ds3 shutdown

path ds3 snmp trap link-status

Configuring T3 Interfaces to Send MDL Messages

You can configure a T3 interface to send MDL messages. MDL messages are supported only when the T3 framing is set for C-bit parity, the default setting.

To configure a T3 interface to send MDL messages:

  1. Specify a SONET interface.
    host1(config)#controller sonet 8/0
  2. (Optional) Configure the interface to operate in an MDL carrier environment.
    host1(config-controll)#path 12 ds3 1 mdl carrier
  3. Specify the MDL messages.
    host1(config-controll)#path 12 ds3 1 mdl string eic "ERX1410" host1(config-controll)#path 12 ds3 1 mdl string fic "FG786" host1(config-controll)#path 12 ds3 1 mdl string lic "Bldg 2" host1(config-controll)#path 12 ds3 1 mdl string pfi "Site 1" host1(config-controll)#path 12 ds3 1 mdl string port 0800 host1(config-controll)#path 12 ds3 1 mdl string unit 080001
  4. Enable transmissions of MDL messages.
    host1(config-controll)#path 12 ds3 1 mdl transmit path-id host1(config-controll)#path 12 ds3 1 mdl transmit idle-signal host1(config-controll)#path 12 ds3 1 mdl transmit test-signal

path ds3 mdl carrier

path ds3 mdl string

path ds3 mdl transmit

Configuring T1 Channels on T3 Interfaces

To configure T1 and fractional T1 channels over T3 interfaces:

  1. Configure the T1 path.
  2. Configure the clock source.

    You must coordinate this setting with the other end of the line to establish which end is the transmit (internal) clock and which is the receive (line) clock.

  3. (Optional) Assign a text description or an alias to the interface.
  4. (Optional) Configure the framing format.
  5. (Optional) Enable processing of SNMP link status information about an interface.
  6. Configure the T1 line parameters.

    You can specify parameters for a single channel, multiple individual channels, ranges of channels, or any combination of the three types of specifications. For example:

    host1(config-controll)#path 12 ds3 1 t1 25-28
  7. (Optional) Enable processing of SNMP link status information about a channel group.

path ds3 t1

path ds3 t1 clock source

path ds3 t1 description

path ds3 t1 framing

path ds3 t1 shutdown

path ds3 snmp trap link-status

path ds3 t1 timeslots

Configuring T1 Channels to Send FDL Messages

To configure T1 channels to send FDL messages:

  1. Specify a SONET interface.
    host1(config)#controller sonet 8/0
  2. Specify the standard for transmission of FDL messages on both ends of the T1 connection.
    host1(config-controll)#path 2 ds3 1 t1 28 fdl ansi
  3. (Optional) Configure the interface to operate in an FDL carrier environment.
    host1(config-controll)#path 2 ds3 1 t1 28 fdl carrier
  4. (ANSI signals) Specify the FDL messages.
    host1(config-controll)#path 2 ds3 1 t1 28 fdl string eic "ERX1410" host1(config-controll)#path 2 ds3 1 t1 28 fdl string lic "Bldg 10" host1(config-controll)#path 2 ds3 1 t1 28 fdl string fic "GY788" host1(config-controll)#path 2 ds3 1 t1 28 fdl string unit 080001
  5. Enable transmission of FDL messages.
    host1(config-controll)#path 2 ds3 1 t1 28 fdl transmit idle-signal

path ds3 t1 fdl

path ds3 t1 fdl carrier

path ds3 t1 fdl string

path ds3 t1 fdl transmit

Configuring Higher Layers

You must configure HDLC over the top layer of the T3 interface. See HDLC Channel Configuration Tasks.

HDLC Channel Configuration Tasks

You must configure HDLC over the T3, T1, unframed E1, or fractional T1/E1 line that you configure on an interface. As Figure 8 shows, HDLC must be the top layer of the interface stack.

To configure an HDLC channel, specify a serial interface. For example:

host1(config)#interface serial 4/0:1/1/1/1

Optional Tasks

The following configuration tasks are optional when you configure an HDLC channel on a channelized T3 interface:

crc

idle-character

interface serial

invert data

mru

mtu

serial description