Cisco ASR 9000 Series User manual

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Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
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Configuring Channelized SONET/SDH on the
Cisco ASR 9000 Series Router
This module describes the configuration of Channelized SONET/SDH on the Cisco ASR 9000 Series
Aggregation Services Routers.
Feature History for Configuring Channelized SONET/SDH on Cisco IOS XR Software
Contents
•Prerequisites for Configuring Channelized SONET/SDH, page 317
•Information About Configuring Channelized SONET/SDH, page 318
•How to Configure Channelized SONET/SDH, page 327
•Configuration Examples for Channelized SONET, page 354
Prerequisites for Configuring Channelized SONET/SDH
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment
is preventing you from using a command, contact your AAA administrator for assistance.
Release Modification
Release 3.9.0 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 2-Port Channelized OC-12/DS0 SPA
Release 4.0.0 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
Support for SDH, E3, E1, and POS channelization was added for the
Cisco 2-Port Channelized OC-12/DS0 and Cisco 1-Port Channelized
OC-48/STM-16 SPAs.
Release 4.0.1 Support for the following SPA was introduced on the
Cisco ASR 9000 Series Router:
•Cisco 1-Port Channelized OC-3/STM-1 SPA

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Before configuring Channelized SONET/SDH, be sure that the following tasks and conditions are met:
•You have at least one of the following SPAs installed in your chassis:
– Cisco 1-Port Channelized OC-3/STM-1 SPA
– Cisco 2-Port Channelized OC-12c/DS0 SPA
– Cisco 1-Port Channelized OC-48/STM-16 SPA
•You should know how to apply and specify the SONET controller name and interface-path-id with
the generalized notation rack/slot/module/port. The SONET controller name and interface-path-id
are required with the controller sonet command.
Information About Configuring Channelized SONET/SDH
To configure Channelized SONET/SDH, you must understand the following concepts:
•Channelized SONET Overview, page 318
•Channelized SDH Overview, page 323
•Default Configuration Values for Channelized SONET/SDH, page 326
•How to Configure Channelized SONET/SDH, page 327
Channelized SONET Overview
Synchronous Optical Network (SONET) is an American National Standards Institute (ANSI)
specification format used in transporting digital telecommunications services over optical fiber.
Synchronous Digital Hierarchy (SDH) is the international equivalent of SONET.
Channelized SONET provides the ability to transport SONET frames across multiplexed T3/E3 and
virtual tributary group (VTG) channels.
Channelized SONET is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12c/DS0 SPA
Channelized SDH is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12c/DS0 SPA
SONET uses Synchronous Transport Signal (STS) framing. An STS is the electrical equivalent to an
optical carrier 1 (OC-1).
SDH uses Synchronous Transport Mode (STM) framing. An STM-1 is the electrical equivalent to 3
optical carrier 1s (OC-1s).
A channelized SONET interface is a composite of STS streams, which are maintained as independent
frames with unique payload pointers. The frames are multiplexed before transmission.

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When a line is channelized, it is logically divided into smaller bandwidth channels called paths. These
paths carry the SONET payload. The sum of the bandwidth on all paths cannot exceed the line
bandwidth.
When a line is not channelized, it is called clear channel, and the full bandwidth of the line is dedicated
to a single channel that carries broadband services.
An STS stream can be channelized into the following types of channels:
•T3/E3
•VT1.5 mapped T1
•Packet over SONET/SDH (POS) (OC12 and OC48 only)
The T3/E3 channels can be channelized further into T1s, and the T1s can be channelized into time slots
(DS0s), except on the 1-Port Channelized OC-48/STM-16 SPA, which does not support T1 or DS0s.
Channelizing a SONET line consists of two primary processes:
•Configuring the controller
•Configuring the interface into channelized paths
You configure the controller first by setting the mode of the STS path. The mode can be set to T3, or
VT1.5-mapped T1, or POS, depending on your hardware support.
Note POS is supported only on the STS-3c and STS-12c paths on the Cisco 1-Port Channelized OC-12/DS0
SPA and on the STS-3c, STS-12c, and STS-48c paths on the Cisco 1-Port Channelized OC-48/STM-16
SPA.
When the mode is specified, the respective controller is created, and the remainder of the configuration
is applied on that controller. For example, mode T3 creates a T3 controller. The T3 controller can then
be configured to a serial channel, or it can be further channelized to carry T1s, and those T1s can be
configured to serial interfaces.
Depending on the support for your installed SPA, each STS path can be independently configured into
T3s, E3s, or VTGs, and so on.

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Figure 22 shows an example of three STS paths for a SONET controller. However, the 2-Port
Channelized OC-12/DS0 SPA supports up to 12 STS paths, and the 1-Port Channelized OC-48/STM-16
SPA supports up to 48 STS paths, but the 1-Port Channelized OC-48/STM-16 SPA does not support
VTGs.
Figure 22 SONET Controller STS Paths
STS 3
SONET
Controller
. . . can be configured as T3s or VTGs
STS 2 . . . can be configured as T3s or VTGs
STS 1 . . . can be configured as T3s or VTGs
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Figure 23 shows an example of some SONET controller configuration combinations.
Note The 1-Port Channelized OC-48/STM-16 SPA on the Cisco ASR 9000 Series Router does not support
VTGs.
Figure 23 SONET Controller Configuration Combinations
STS 3
SONET
Controller
STS 2
STS 1
Clear Channel
T3
210873
VTG 1
VTG 2
VTG 3
VTG 4
VTG 5
VTG 6
VTG 7

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Figure 24 shows the T3 paths that can be configured.
Note Channelized T3 paths are only supported on the 1-Port Channelized OC-3/STM-1 SPA and 2-Port
Channelized OC-12c/DS0 SPA.
Figure 24 SONET T3 Channelized Paths
STS 3
SONET
Controller
. . . same possibilities as STS 1
STS 2 . . . same possibilities as STS 1
STS 1
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DS0
DS0
DS0
DS0
DS0
DS0
DS0
DS0
DS0
. . . up to 24 DS0s
T1
T1
T1
T1
T1
T1
T1
T1
T1
T3
T3
T3
. . . up to 28 T1s
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .

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Figure 25 shows the VTG paths that can be configured.
Note VTG paths are only supported on the Cisco 1-Port Channelized OC-3/STM-1 SPA and Cisco 2-Port
Channelized OC-12c/DS0 SPA on the Cisco ASR 9000 Series Router.
Figure 25 SONET VTG Channelized Paths
Channelized SDH Overview
Synchronous Digital Hierarchy (SDH) is the international equivalent of SONET.
Channelized SDH is supported on the following SPAs:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12/DS0 SPA
A Synchronous Transport Module (STM) signal is the Synchronous Digital Hierarchy (SDH) equivalent
of the SONET STS, but the numbers are different for each bandwidth. In this guide, the STM term refers
to both path widths and optical line rates. The paths within an STM signals are called administrative
units (AUs).
A summary of the basic terminology differences between SONET and SDH is as follows:
•SONET STS is equivalent to SDH administrative unit (AU)
•SONET VT is equivalent to SDH tributary unit (TU)
•SDH basic building blocks are STM-1 (equivalent to STS-3) and STM-0 (equivalent to STS-1)
STS 3
SONET
Controller
. . . same configuration possibilities as STS 1
STS 2 . . . same configuration possibilities as STS 1
STS 1
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VTG 1
VTG 2
VTG 3
VTG 4
VTG 5
VTG 6
VTG 7
T1
T1
T1
T1
Each STS
can be channelized
into 7 VTGs.
Each VTG
can be channelized
into 4 T1s.

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An administrative unit (AU) is the information structure that provides adaptation between the
higher-order path layer and the multiplex section layer. It consists of an information payload (the
higher-order virtual container) and an administrative unit pointer, which indicates the offset of the
payload frame start relative to the multiplex section frame start.
An AU can be channelized into tributary units (TUs) and tributary unit groups (TUGs).
An administrative unit 4 (AU-4) consists of three STM-1s or an STM-3.
An administrative unit 3 (AU-3) consists of one STM-1.
An administrative unit group (AUG) consists of one or more administrative units occupying fixed,
defined positions in an STM payload.
On the Cisco ASR 9000 Series Router, the following levels of SDH channelization are supported:
•1-Port Channelized OC-3/STM-1 SPA
– AU4 to TUG-3 to TUG-2 to VC-12 to E1 to NxDS0
– AU4 to TUG-3 to VC-3 to DS3 (Clear Channel)
– AU4 to TUG-3 to VC-3 to E3 (Clear Channel)
– AU3 to TUG-2 to VC-11 to DS1 to NxDS0
•2-Port Channelized OC-12/DS0 SPA
– AU-4-4c (VC-4-4c)
– AU-4 (VC-4)
– AU-4 to TUG-3 to VC-3 to DS3
– AU-4 to TUG-3 to VC-3 to E3
– AU-4 to TUG-3 to TUG-2 to VC-11 to T1 to NxDS0
– AU-4 to TUG-3 to TUG-2 to VC-12 to E1to NxDS0
– AU-3 to VC-3 to DS3
– AU-3 to TUG-2 to VC-11 to T1 to NxDS0
– AU-3 to TUG-2 to VC-12 to E1to NxDS0
– AU-3 to VC-3 to E3
– AU-3 to VC-3 to DS3 to T1 to NxDS0
Table 2 SONET and SDH Terminology Equivalencies
SONET Term SDH Term
SONET SDH
STS-3c AU-4
STS-1 AU-3
VT TU
SPE VC
Section Regenerator Section
Line Multiplex Section
Path Path

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– AU-3 to VC-3 to DS3 to E1 to NxDS0
•1-Port Channelized OC-48/STM-16 SPA
– DS3
– E3
– AU-3 (VC-3)
– AU-4 (VC-4)
– AU-4-4c (VC-4-4c)
– AU-4-16c (VC-4-16c)
Figure 26 shows an example of SDH AU-3 paths that can be configured on certain supported SPAs.
Note The 1-Port Channelized OC-48/STM-16 SPA does not support further channelization of AU-3 paths into
T1s.
Figure 26 SDH AU3 Paths
SONET
Controller
210874
C11-T1
T1
AU-3
C11-T1
T1
AU-3
C11-T1
T1
AU-3
STM-1

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Figure 27 shows the SDH AU4 paths that can be configured on supported SPAs.
Note The 1-Port Channelized OC-48/STM-16 SPA only supports channelization to the T3 or E3 level. Further
channelization of AU-4 paths is not supported.
Figure 27 SDH AU4 Paths
Default Configuration Values for Channelized SONET/SDH
Table 3 describes the default configuration parameters that are present on the Channelized SONET/SDH.
SONET
Controller
210875
TUG-3
T3
or C12
AU-4
STM-1
E1
E1
E1
E1
E1
E1
E1
E1
E1
E1
Up to 21 E1s
Table 3 SONET/SDH Controller Default Cit onfiguration Values
Parameter Default Value Configuration File Entry
Clock source line clock source {internal | line}
SONET framing sonet framing {sdh | sonet}

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How to Configure Channelized SONET/SDH
This section contains the following procedures:
•Configuring SONET T3 and VT1.5-Mapped T1 Channels, page 327
•Configuring Packet over SONET Channels, page 332
•Configuring a Clear Channel SONET Controller for T3, page 335
•Configuring Channelized SONET APS, page 338
•Configuring SDH AU-3, page 341
•Configuring SDH AU-4, page 349
Configuring SONET T3 and VT1.5-Mapped T1 Channels
This task explains how to configure a SONET line into T3 and VT-mapped T1 Channels.
Prerequisites
•You should know how to configure the SONET controller as specified in the “How to Configure
Clear Channel SONET Controllers” section of the Configuring Clear Channel SONET Controllers
on the Cisco ASR 9000 Series Router module.
•STS paths can be channelized into T3s on the following SPAs:
– Cisco 1-Port Channelized OC-48/STM-16 SPA
– Cisco 1-Port Channelized OC-3/STM-1 SPA
– Cisco 2-Port Channelized OC-12/DS0 SPA
•STS paths can be channelized into VTG mapped T1s on the following SPA:
– Cisco 1-Port Channelized OC-3/STM-1 SPA
– Cisco 2-Port Channelized OC-12/DS0 SPA
•T3 paths can be channelized into T1s or E1s on the following SPA:
– Cisco 1-Port Channelized OC-3/STM-1 SPA
– Cisco 2-Port Channelized OC-12/DS0 SPA
•T1 paths can be channelized into NxDS0s on the Cisco 2-Port Channelized OC-12/DS0 SPA.
Restrictions
T1s and E1s are not supported on the Cisco 1-Port Channelized OC-48/STM-16 SPA.
SUMMARY STEPS
1. configure
2. controller sonet interface-path-id
3. clock source {internal | line}
4. framing sonet

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5. sts number
6. mode mode
7. width number
8. root
9. controller controllerName instance
10. mode mode
11. root
12. controller t1 interface-path-id
13. channel-group number
14. timeslots num1:num2:num3:num4
or
timeslots range1-range2
15. show configuration
16. root
17. interface serial interface-path-id
18. encapsulation {frame-relay | hdlc | ppp}
19. ipv4 ip-address mask
20. no shutdown
21. end
or
commit
22. show
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller sonet interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller
sonet 0/1/1/0
Enters SONET controller configuration submode and specifies the
SONET controller name and interface-path-id with the
rack/slot/module/port notation.

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Step 3 clock source {internal | line}
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
clock source internal
Configures the SONET port transmit clock source, where the
internal keyword sets the internal clock and the line keyword sets
the clock recovered from the line.
•Use the line keyword whenever clocking is derived from the
network. Use the internal keyword when two routers are
connected back to back or over fiber for which no clocking is
available.
•line is the default keyword.
Note Internal clocking is required for SRP interfaces.
Step 4 framing sonet
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
framing sonet
Configures the controller for SONET framing.
SONET framing (sonet)is the default.
Step 5 sts number
Example:
RP/0/RSP0/CPU0:router(config-sonet)# sts
1
Configures the STS stream specified by number. The ranges are:
•1 to 48—1 Port Channelized OC-48/STM-16 SPA
•1 to 3—1-Port Channelized OC-3/STM-1 SPA
•1 to 12—2-Port Channelized OC-12/DS0 SPA
Step 6 mode mode
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
mode t3
Sets the mode of interface at the STS level. The possible modes are:
•t3—SONET path carrying T3
•vt15-t1—SONET path carrying virtual tributary 1.5 T1s
(VT15 T1) (1-Port Channelized OC-3/STM-1 SPA and 2-Port
Channelized OC-12c/DS0 SPA only)
•pos—Packet over SONET
Step 7 width number
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
width 3
Configures the number of the STS streams that are concatenated.
The possible values for number are:
•1—Indicating one STS stream
•3—Indicating three STS streams (STS-3c)
•12—Indicating concatenation of 12 STS streams (STS-12c)
•48—Indicating concatenation of 48 STS streams (STS-48c).
This is the default on the 1-Port Channelized OC-48/STM-16
SPA.
Widths 3, and 12, and 48 are configured on STS paths at natural
boundaries, which coincide with the following path numbers:
•1, 4, 7, 10, and so on, for STS-3c
•1, 13, 25, and 37 for STS-12c
•1 for STS-48c
Step 8 root
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
root
Exits to global configuration mode.
Command or Action Purpose

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Step 9 controller controllerName instance
Example:
RP/0/RSP0/CPU0:router(config)# controller
t3 0/1/1/0/0
Enters controller configuration submode and specifies the
controller name and instance identifier with the
rack/slot/module/port/controllerName notation. The controller
names are:
•t3—SONET path carrying T3
•vt15-t1—SONET path carrying virtual tributary 1.5 T1s
(VT15 T1) (1-Port Channelized OC-3/STM-1 SPA and 2-Port
Channelized OC-12c/DS0 SPA only)
Step 10 mode mode
Example:
RP/0/RSP0/CPU0:router(config-t3)# mode t1
Sets the mode of interface at this level. The possible modes are:
•t1—Channelized into 28 T1s (1-Port Channelized
OC-3/STM-1 SPA and 2-Port Channelized OC-12c/DS0 SPA
only)
•e1—Channelized into 21 E1s (1-Port Channelized
OC-3/STM-1 SPA and 2-Port Channelized OC-12c/DS0 SPA
only)
•serial—Clear channel carrying an HDLC-like payload
Step 11 root
Example:
RP/0/RSP0/CPU0:router(config-t3)# root
Exits to global configuration mode.
Step 12 controller t1 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller
t1 0/1/1/0/0/0
Enters T1 controller configuration submode and specifies the T1
controller name and interface-path-id with the
rack/slot/module/port/T3Num/T1num notation.
(1-Port Channelized OC-3/STM-1 SPA and 2-Port Channelized
OC-12c/DS0 SPA only)
Step 13 channel-group number
Example:
RP/0/RSP0/CPU0:router(config-t1)#
channel-group 1
Sets the channel group number to which time slots are assigned.
The range is from 1 to 24.
Step 14 timeslots num1:num2:num3:num4
or
timeslots range1-range2
Example:
RP/0/0/CPU0:router(config-t1-channel_grou
p)# timeslots 1:3:7:9
RP/0/0/CPU0:router(config-t1-channel_grou
p)# timeslots 1-24
Specifies the time slots for the interface by number with the
num1:num2:num3:num4 notation, or by range with the
range1-range2 notation.
Step 15 show configuration
Example:
RP/0/RSP0/CPU0:router(config-t1-channel_g
roup)# show configuration
Displays the contents of uncommitted configuration.
Command or Action Purpose

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Step 16 root
Example:
RP/0/RSP0/CPU0:router(config-t3)# root
Exits to global configuration mode.
Step 17 interface serial interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# interface
serial 0/1/1/0/0/0:0
Specifies the complete interface number with the
rack/slot/module/port/T3Num/T1num:instance notation.
Step 18 encapsulation {frame-relay | hdlc | ppp}
Example:
RP/0/RSP0/CPU0:router(config-if)#
encapsulation ppp
Specifies the encapsulation type with the one of the following
keywords:
•frame-relay—Frame Relay network protocol
•hdlc—High-level Data Link Control (HDLC) synchronous
protocol
•ppp—Point-to-Point Protocol
Step 19 ipv4 ip-address mask
Example:
RP/0/RSP0/CPU0:router(config-if)# ip
address 10.10.10.10 255.255.255.255
Assigns an IP address and subnet mask to the interface.
Step 20 no shutdown
Example:
RP/0/RSP0/CPU0:router(config-if)# no
shutdown
Removes the shutdown configuration.
Note Removal of the shutdown configuration eliminates the
forced administrative down on the interface, enabling it to
move to an up or down state (assuming that the parent
SONET layer is not configured administratively down).
Command or Action Purpose

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Configuring Packet over SONET Channels
This task explains how to configure Packet over SONET (POS) channels on SPAs supporting
channelized SONET.
Prerequisites
You have one of the following SPAs installed:
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 2-Port Channelized OC-12/DS0 SPA
SUMMARY STEPS
1. configure
2. controller sonet interface-path-id
3. clock source {internal | line}
4. framing {sdh | sonet}
5. sts number
6. width number
Step 21 end
or
commit
Example:
RP/0/0RSP0/CPU0:router(config-sonet)# end
or
RP/0/RSP0/CPU0:router(config-sonet)#
commit
Saves configuration changes.
•When you issue the end command, the system prompts you to
commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the running
configuration file, exits the configuration session, and
returns the router to EXEC mode.
– Entering no exits the configuration session and returns the
router to EXEC mode without committing the
configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or committing the
configuration changes.
•Use the commit command to save the configuration changes to
the running configuration file and remain within the
configuration session.
Step 22 show controllers sonet interface-path-id
Example:
RP/0/RSP0/CPU0:router# show controllers
sonet 0/1/1/0
Verifies the SONET controller configuration.
Command or Action Purpose

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7. mode mode scramble
8. root
9. interface pos interface-path-id
10. encapsulation [hdlc | ppp | frame-relay [IETF]]
11. pos crc {16 | 32}
12. mtu value
13. no shutdown
14. end
or
commit
15. show interfaces pos interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller sonet interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller
sonet 0/1/1/0
Enters SONET controller configuration submode and specifies the
SONET controller name and interface-path-id with the
rack/slot/module/port notation.
Step 3 clock source {internal | line}
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
clock source internal
Configures the SONET port transmit clock source, where the
internal keyword sets the internal clock and the line keyword sets
the clock recovered from the line.
•Use the line keyword whenever clocking is derived from the
network. Use the internal keyword when two routers are
connected back to back or over fiber for which no clocking is
available.
•line is the default keyword.
Note Internal clocking is required for SRP interfaces.
Step 4 framing {sdh | sonet}
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
framing sonet
(Optional) Configures the controller framing with either the sdh
keyword for Synchronous Digital Hierarchy (SDH) framing or the
sonet keyword for SONET framing.
SONET framing (sonet)is the default.
Step 5 sts number
Example:
RP/0/RSP0/CPU0:router(config-sonet)# sts
1
Configures the STS stream specified by number. The ranges are:
•1 to 12 on the 2-Port Channelized OC12c/DS0 SPA
•1 to 48 on the 1 Port Channelized OC48/DS3 SPA

Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
How to Configure Channelized SONET/SDH
HC-334
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
Step 6 width number
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
width 3
Configures the number of the STS streams that are concatenated.
The possible values for number are:
•3—Indicating three STS streams (STS-3c)
•12—Indicating concatenation of 12 STS streams (STS-12c)
•48—Indicating concatenation of 48 STS streams (STS-48c)
Widths 3, 12, and 48 are configured on STS paths at natural
boundaries, which coincide with the following path numbers:
•1, 4, 7, 10, and so on, for STS-3c
•1, 13, 25, and 37 for STS-12c
•1 for STS-48c
Note POS interfaces are not supported when width is 1.
Step 7 mode mode scramble
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
mode pos scramble
Sets the mode of interface at the STS level. Set the mode to pos to
create POS interface (OC12 and OC48 only).
Step 8 root
Example:
RP/0/RSP0/CPU0:router(config-stsPath)#
root
Exits to global configuration mode.
Step 9 interface pos interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# interface
POS 0/1/1/0
Specifies the POS interface name and notation
rack/slot/module/port, and enters interface configuration mode.
Step 10 encapsulation [hdlc | ppp | frame-relay
[IETF]]
Example:
RP/0/RSP0/CPU0:router(config-if)#
encapsulation hdlc
(Optional) Configures the interface encapsulation parameters and
details such as HDLC or PPP. The default is HDLC.
Step 11 pos crc {16 | 32}
Example:
RP/0/RSP0/CPU0:router(config-if)# pos crc
32
(Optional) Configures the CRC value for the interface. Enter the 16
keyword to specify 16-bit CRC mode, or enter the 32 keyword to
specify 32-bit CRC mode.
The default CRC is 32.
Step 12 mtu value
Example:
RP/0/RSP0/CPU0:router(config-if)# mtu
4474
(Optional) Configures the POS MTU value.
The range is 64–65535.
Command or Action Purpose

Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
How to Configure Channelized SONET/SDH
HC-335
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
Configuring a Clear Channel SONET Controller for T3
This task explains how to configure a SONET line into a single T3 serial channel called clear channel.
Clear channel is established by setting the T3 controller mode to serial.
Prerequisites
•You should know how to configure the SONET controller as specified in the “How to Configure
Clear Channel SONET Controllers” section of the Configuring Clear Channel SONET Controllers
on the Cisco ASR 9000 Series Router module.
SUMMARY STEPS
1. configure
2. controller sonet interface-path-id
3. clock source {internal | line}
Step 13 no shutdown
Example:
RP/0/RSP0/CPU0:router (config-if)# no
shutdown
Removes the shutdown configuration.
Note Removal of the shutdown configuration eliminates the
forced administrative down on the interface, enabling it to
move to an up or down state (assuming that the parent
SONET layer is not configured administratively down).
Step 14 end
or
commit
Example:
RP/0/RSP0/CPU0:router(config-sonet)# end
or
RP/0/RSP0/CPU0:router(config-sonet)#
commit
Saves configuration changes.
•When you issue the end command, the system prompts you to
commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the running
configuration file, exits the configuration session, and
returns the router to EXEC mode.
– Entering no exits the configuration session and returns the
router to EXEC mode without committing the
configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or committing the
configuration changes.
•Use the commit command to save the configuration changes to
the running configuration file and remain within the
configuration session.
Step 15 show interfaces pos interface-path-id
Example:
RP/0/0/CPU0:router# show interfaces pos
0/1/1/0
(Optional) Displays the interface configuration.
Command or Action Purpose

Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router
How to Configure Channelized SONET/SDH
HC-336
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
4. framing sonet
5. sts number
6. mode t3
7. root
8. controller t3 interface-path-id
9. mode serial
10. root
11. interface serial interface-path-id
12. encapsulation {frame-relay | hdlc | ppp}
13. ipv4 ip-address mask
14. no shutdown
15. end
or
commit
16. show controllers sonet interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller sonet interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller
sonet 0/1/1/0
Enters SONET controller configuration submode and specifies the
SONET controller name and interface-path-id with the
rack/slot/module/port notation.
Step 3 clock source {internal | line}
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
clock source internal
Configures the SONET port transmit clock source, where the
internal keyword sets the internal clock and the line keyword sets
the clock recovered from the line.
•Use the line keyword whenever clocking is derived from the
network. Use the internal keyword when two routers are
connected back to back or over fiber for which no clocking is
available.
•line is the default keyword.
Note Internal clocking is required for SRP interfaces.
Step 4 framing sonet
Example:
RP/0/RSP0/CPU0:router(config-sonet)#
framing sonet
Configures the controller for SONET framing. SONET framing
(sonet)is the default.