Cisco ASR 900 Series User manual

1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration
Guide, Cisco IOS XE Everest 16.7.x (Cisco ASR 900 Series)
First Published: 2017-11-17
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©2017 Cisco Systems, Inc. All rights reserved.

CONTENTS
CHAPTER 1 Configuring CEM 1
Overview of Circuit Emulation 1
Restrictions for CEM 1
Structure-Agnostic TDM over Packet 2
Configuring CEM for SAToP 2
Configuring CEM Group for SAToP for T1 Interfaces 2
Configuring CEM Classes 3
Configuring CEM Parameters 3
Configuring Payload Size (Optional) 3
Setting the Dejitter Buffer Size 3
Shutting Down a CEM Channel 4
Configuring DS1 CT3 SAToP Mode 4
Configuring VT DS1 SAToP Mode 4
Configuring STS-Nc CEP 4
Configuring CEP 5
Configuring VT-15 CEP 5
Configuring DS3 SAToP 5
Configuring CEM APS 5
Configuring Unidirectional APS for SAToP 6
Configuring Bi-directional ACR (SONET Framing) for SAToP 6
Verifying CEM Statistics for SAToP 6
Associated Commands 7
Additional References for Configuring CEM 9
CHAPTER 2 CEM over MPLS QoS 11
Finding Feature Information 11
Information About CEM over MPLS QOS 11
Classifying and Marking MPLS EXP Overview 11
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Prerequisites for CEM over MPLS QoS 12
Restrictions for CEM over MPLS QoS 12
How to Classify and Mark MPLS EXP 12
Classifying MPLS Encapsulated Packets 12
Marking MPLS EXP on Imposed Labels 13
Classifying and Marking MPLS EXP 13
Configuration Examples 13
Example: Defining an MPLS EXP Class Map 13
Example: Defining a Policy Map and Applying the Policy Map to an Ingress Interface 14
Example: Defining a Policy Map and Applying the Policy Map to an Egress Interface 14
Example: Defining an MPLS EXP Imposition Policy Map 14
Example: Applying the MPLS EXP Imposition Policy Map to a Main Interface 15
Example: Applying the MPLS EXP Imposition Policy Map to an EVC 15
Example: Defining an MPLS EXP Label Switched Packets Policy Map 15
Example: Applying the MPLS EXP Label Switched Packets Policy Map to a Main
Interface 16
Additional References for CEM over MPLS QoS 16
CHAPTER 3 Configuring SONET 19
Overview of SONET 20
Restrictions for SONET 20
SONET Switching 21
SONET Hierarchy 22
Section 22
Line 22
Path 22
STS-1 and STS-3 Frames 23
SONET Line and Section Configuration Parameters 24
BERT 25
Concatenated SONET Frames 26
SONET Path Level Configuration Parameters 26
Channelized SONET Frames 27
SONET T1 Configuration Parameters 27
SONET T3 Configuration Parameters 27
SONET VT Configuration Parameters 28
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SONET Protection Switching 28
1+1 APS 28
Benefits of APS 29
APS 1+1 for SONET Layer 1 traffic 29
Scenario for Bidirectional APS 1+1 30
Scenario for Unidirectional APS 1+1 31
UPSR Path Protection 31
Configuring UPSR 32
Configuring UPSR Work and Protection Path Configuration 32
Verification of UPSR Configuration 33
Alarms at SONET Layers 33
SONET Alarm Surveillance 33
Section Alarms 33
Line Alarms 34
Path Alarms 34
VT Alarms 34
T1 Alarms 35
T3 Alarms 35
Alarm Indicators 35
How to Configure SONET 35
Prerequisites for Configuring SONET 36
Configuring MediaType Controller 36
Configuring SONET Ports 36
Managing and Monitoring SONET Line 36
Configuring Line and Section Overhead 36
Configuring Line and Section Threshold 37
Configuring Line Loopback 37
Configuring AIS Shut 37
Configuring Shut 37
Configuring Alarm Reporting 38
Configuring Clock 38
Configuring STS-1 Modes 38
Configuring DS1/T1 CT3 mode of STS-1 39
Configuring STS-Nc - Contiguous Concatenation 39
Configuring CEM Group for Sonet Mode VT1.5-T1 in CESoPSN 40
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Configuring CEM Group for Sonet Mode CT3-T1 in CESoPSN 40
Configuring APS for SAToP 40
Configuring Bi-directional ACR (SONET Framing) for SAToP 40
Configuring Unidirectional APS for SAToP 40
Verifying ACR Configurations for SAToP 41
Configuring APS for CESoPSN 43
Configuring CEM Group for APS CT3-T1 in CESoPSN 43
Configuring CEM Group for APS VT1.5-T1 in CESoPSN 43
Configuring VT 1.5-T1 Loopback 44
Configuring VT 1.5-T1 BERT 44
Configuring Path Overhead 44
Configuring Path Threshold 45
Verification of SONET Configuration 45
Performance Monitoring Use Cases or Deployment Scenarios 48
ONS Pluggables 51
Configuring ONS Pluggables 51
Verifying the Supported Pluggables 51
Configuring BERT in Sonet for CESoPSN 53
Restrictions for SONET BERT on CESoPSN 54
Configuring VT1.5-T1 BERT for CESoPSN 54
Verifying VT1.5-T1 BERT Configuration for CESoPSN 55
Configuring CT3-T1 mode BERT for CESoPSN 55
Verifying CT3-T1 mode BERT for CESoPSN 55
Clock Recovery System in CESoPSN 55
Adaptive Clock Recovery in CESoPSN 56
Differential Clock Recovery in CESoPSN 56
Benefits of Clock Recovery 57
Prerequisites for Clock Recovery 57
Restrictions for Clock Recovery 57
Configuring ACR in VT 1.5-T1 mode for CESoPSN 58
Verifying ACR in VT 1.5-T1 mode for CESoPSN 58
Configuring DCR in VT 1.5-T1 mode for CESoPSN 58
Verifying DCR in VT 1.5-T1 mode for CESoPSN 59
Configuring ACR in CT3-T1 mode for CESoPSN 59
Verifying ACR in CT3-T1 mode for CESoPSN 59
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Configuring DCR in CT3-T1 mode for CESoPSN 60
Verifying DCR in CT3-T1 mode for CESoPSN 60
Configuring Clocking for ACR and DCR on APS for CESoPSN 60
Configuring Clocking for ACR on APS CT3-T1 in CESoPSN 60
Verifying Clocking for ACR on APS CT3-T1 in CESoPSN 61
Configuring Clocking for DCR on APS CT3-T1 in CESoPSN 61
Verifying Clocking for DCR on APS CT3-T1 in CESoPSN 62
Configuring Clocking for ACR on APS VT 1.5-T1 in CESoPSN 62
Verifying Clocking for ACR on APS VT 1.5-T1 in CESoPSN 63
Configuring Clocking for DCR on APS VT 1.5-T1 in CESoPSN 63
Verifying Clocking for DCR on APS VT 1.5-T1 in CESoPSN 64
Associated Commands 64
Additional References for Configuring SONET on 1-Port OC192/STM-64 or 8-Port
OC3/12/48/STM-1/-4/-16 Interface Module 67
CHAPTER 4 Configuring SDH on 1-Port OC-192/STM-64 or 8-Port OC-3/12/48/STM-1/-4/-16 Module 69
Overview of SDH 70
Basic SDH Signal 70
SDH Hierarchy 70
SDH Frame Structure 70
VC 72
CEM Overview 72
Services Provided by SDH Configuration 73
SDH Multiplexing 75
Modes of SDH 76
Configuring AUG Mapping 77
Configuring AU-3 or AU-4 Mapping 77
Configuring Mixed AU-3 and AU-4 Mapping 77
Verifying AUG Mapping Configuration 77
Configuring Modes under AU-4 Mapping 78
Configuring Mode VC4 CEP 78
Verifying Mode VC-4 Configuration 78
Configuring Mode TUG-3 79
Configuring AU-4 —TUG-3 —VC-3 —DS3 79
Verifying DS3 Configuration 79
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Configuring AU-4 —TUG-3 —VC-3 —E3 80
Verifying E3 Configuration 80
Configuring Mode VC-1x 80
Configuring AU-4 —TUG-3 —TUG-2 —VC-11 —T1 81
Configuring AU-4 —TUG-3 —TUG-2 —VC-12 81
Configuring AU-4 —TUG-3 —TUG-2 —VC-11 —VC 82
Configuring AU-4 —TUG-3 —TUG-2 —VC-12 —VC 82
Verifying Mode VC-1x Configuration 82
Configuring Mode VC-4 Nc 83
Verifying Mode VC-4 Nc Configuration 83
Configuring AU-3 —VC-3 —DS3 83
Configuring AU-3 —VC-3 —E3 84
Configuring Modes under AU-3 Mapping 84
Configuring Mode VC-1x 84
Configuring AU-3 —TUG-2 —VC-11 —VC 84
Configuring AU-3 —TUG-2 —VC-12 —VC 84
Configuring AU-3 —TUG-2 —VC-11 —T1 85
Configuring AU-3 —TUG-2 —VC-12 —E1 85
Verifying Mode VC-1x Configuration 85
Restrictions for SDH in SAToP 86
Restrictions for SDH in CESoPSN 87
Configuring Mediatype Controller 88
Configuring Rate on SDH Ports 88
SDH Line and Section Configuration Parameters 89
Overhead 89
Configuring Line and Section Overhead 89
Threshold 89
Configuring Line and Section Threshold 90
Loopback 90
Configuring Line Loopback 90
AIS-Shut 90
Configuring AIS Shut 91
Shutdown 91
Configuring Shut 91
Alarm Reporting 91
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Configuring Alarm Reporting 92
Clock Source 92
Configuring Clock 92
Verifying SDH Line and Section Parameters Configuration 93
Configuring SDH Path Parameters 93
Path Overhead 93
C2 Flag 94
J1 Flag 94
Path Threshold 94
Configuring Path Threshold 95
Path Loopback 95
Configuring Path Loopback 95
Configuring Path BERT 95
Verifying Path Parameters Configuration 95
Configuring BERT in SDH for SAToP 96
Configuring BERT in Modes VC-4 and VC Nc 97
Verifying BERT Configuration in Modes VC-4 and VC Nc 97
Configuring T1 Bert 97
Configuring E1 Bert 98
Configuring BERT in Mode T3/E3 98
Verifying BERT Configuration in Mode T3/E3 98
Configuring BERT in Mode VC-1x 99
Verifying BERT Configuration in Mode VC-1x 99
Configuring BERT in SDH for CESoPSN 99
Restrictions for SDH BERT on CESoPSN 100
Configuring BERT in AUG mapping AU-3 VC1x T1 for CESoPSN 100
Configuring BERT in AUG mapping AU-4 VC1x E1 for CESoPSN 101
Verifying BERT Configuration in AUG mapping AU-3 VC1x T1 or AU-4 VC1x E1 for
CESoPSN 101
SDH T1/E1 Configuration Parameters for SAToP 101
Configuring T1/E1 Parameters 102
Verifying T1/E1 Parameters Configuration 102
SDH T3/E3 Configuration Parameters for SAToP 102
Configuring SDH T3/E3 Parameters Configuration 103
Verifying SDH T3/E3 Parameters Configurations 103
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SDH VC Configuration Parameters for SAToP 103
Configuring VC Parameters 104
Verifying VC Configuration Parameters Configurations 104
Configuring CEM Group for CESoPSN 105
Configuring CEM Group for AU3-T1 on SDH for CESoPSN 105
Verifying CEM Group for AU3-T1 on SDH for CESoPSN 105
Configuring CEM Group for AU4-E1 on SDH for CESoPSN 106
Verifying CEM Group for AU4-E1 on SDH for CESoPSN 106
Configuring ACR and DCR for SAToP 107
Configuring ACR for SAToP 107
Verifying ACR Configuration 108
Configuring DCR for SAToP 108
Verifying DCR Configuration 109
Configuring ACR and DCR for CESoPSN 109
Configuring ACR for CESoPSN 109
Verifying ACR Configuration for CESoPSN 110
Configuring DCR for CESoPSN 110
Verifying DCR Configuration for CESoPSN 111
CHAPTER 5 Configuring MSP on 1-Port OC192/STM-64 or 8-Port OC3/12/48/STM-1/-4/-16 Module 113
1+1 MSP 114
Benefits of MSP 114
Restrictions for MSP 114
MSP 1+1 for SDH Layer 1 traffic 115
Scenario for Bidirectional MSP 1+1 115
Scenario for Unidirectional MSP 1+1 116
Configuring MSP for SAToP 116
Verifying MSP Configuration for SAToP 118
Configuring MSP for CESoPSN 119
Configuring CEM Group for MSP on Virtual ACR AU3-T1 in CESoPSN 119
Verifying CEM Group for MSP on Virtual ACR AU3-T1 in CESoPSN 119
Configuring CEM Group for MSP on Virtual ACR AU4-E1 in CESoPSN 120
Verifying CEM Group for MSP on Virtual ACR AU4-E1 in CESoPSN 120
Configuring Clocking ACR for MSP AU3-T1 in CESoPSN 121
Verifying Clocking ACR for MSP AU3-T1 in CESoPSN 122
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Configuring Clocking DCR for MSP AU3-T1 in CESoPSN 122
Verifying Clocking DCR for MSP AU3-T1 in CESoPSN 123
Configuring Clocking ACR for MSP AU4-E1 in CESoPSN 123
Verifying Clocking ACR for MSP AU4-E1 in CESoPSN 123
Configuring Clocking DCR for MSP AU4-E1 in CESoPSN 124
Verifying Clocking DCR for MSP AU4-E1 in CESoPSN 124
CHAPTER 6 Configuring SNCP on 1-Port OC192/STM-64 or 8-Port OC3/12/48/STM-1/-4/-16 Module 125
Restrictions for SNCP 125
SNCP Path Protection 125
Configuring SNCP 126
Verification of SNCP Configuration 127
CHAPTER 7 Alarm History 129
Alarm History Restrictions 129
Configuring Alarm History 130
Verification of Alarm History Configuration 130
Associated Commands 131
Additional References for Alarm History 131
CHAPTER 8 Clock Recovery System for SAToP 133
Prerequisites for Clock Recovery 133
Restrictions for Clock Recovery 133
Finding Feature Information 134
Adaptive Clock Recovery (ACR) 134
Benefits of ACR for 8 T1/E1 Interface Module 134
Restrictions for ACR on 8 T1/E1 Interface Module 134
Prerequisites for ACR Configuration in 8 T1/E1 Interface Module 135
Configuring ACR for T1 Interfaces for SAToP 135
Verifying the ACR Configuration of T1 Interfaces for SAToP 136
Associated Commands 137
Configuring ACR for OCn 137
Configuring ACR in Mode VT15 for SAToP 137
Verifying ACR in Mode VT15 for SAToP 138
Configuring ACR in mode T3 for SAToP 138
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Verifying ACR in Mode T3 for SAToP 139
Configuring ACR in Mode CT3 for SAToP 139
Verifying ACR in Mode CT3 for SAToP 140
Differential Clock Recovery (DCR) 140
Explicit Pointer Adjustment Relay (EPAR) 141
Restrictions for EPAR 141
Benefits of Clock Recovery 142
Configuring DCR for OCn 142
Configuring DCR in Mode VT15 for SAToP 142
Verifying DCR in Mode VT15 for SAToP 142
Configuring DCR in Mode CT3 for SAToP 143
Verifying DCR in Mode CT3 for SAToP 143
Configuring DCR in Mode T3 for SAToP 144
Verifying DCR in Mode T3 for SAToP 144
Configuring ACR in Mode CT3 for CESoPSN 145
Verification of EPAR Configuration 145
Recovering a Clock 146
Example: Adaptive Clock Recovery (ACR) for SAToP 146
Example: Differential Clock Recovery (DCR) for SAToP 147
Additional References for Clock Recovery 147
CHAPTER 9 Configuring 5G Mode on 1-Port OC-192/STM-64 or 8-Port OC-3/12/48/STM-1/-4/-16 Interface
Module 149
Supported Traffic Combinations 152
Restrictions for Configuring 1-Port OC-192/STM-64 or 8-Port OC-3/12/48/STM-1/-4/-16
Interface Module 152
Important Notes on Configuration 152
Configuring 5G Mode from 10G Mode 153
Configuring 10G Mode from 5G Mode 153
Verification of 5G Traffic Configuration 153
Associated Commands 153
CHAPTER 10 Configuring Data Communication Channel 155
Restrictions of DCC 156
Configuring PPP 157
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Configuring CLNS or LAPD 157
Verification of DCC Configiration 157
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CHAPTER 1
Configuring CEM
This module describes how to configure Circuit Emulation (CEM).
•Overview of Circuit Emulation, page 1
•Configuring CEM for SAToP, page 2
•Verifying CEM Statistics for SAToP, page 6
•Associated Commands, page 7
•Additional References for Configuring CEM, page 9
Overview of Circuit Emulation
Circuit Emulation (CEM) is a technology that provides a protocol-independent transport over IP/MPLS
networks. It enables proprietary or legacy applications to be carried transparently to the destination, similar
to a leased line.
CEM provides a bridge between a Time-Division Multiplexing (TDM) network and Multiprotocol Label
Switching (MPLS) network. The chassis encapsulates the TDM data in the MPLS packets and sends the data
over a CEM pseudowire to the remote Provider Edge (PE) chassis. As a result, CEM functions as a physical
communication link across the packet network.
The chassis supports the pseudowire type that utilizes CEM transport: Structure-Agnostic TDM over Packet
(SAToP).
L2VPN over IP/MPLS is also supported on the interface modules.
Restrictions for CEM
The framed command is not supported.
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
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Structure-Agnostic TDM over Packet
Structure-Agnostic TDM over Packet (SAToP) encapsulates Time Division Multiplexing (TDM) bit-streams
as pseudowires over public switched networks. It disregards any structure that may be imposed on streams,
in particular the structure imposed by the standard TDM framing.
The protocol used for emulation of these services does not depend on the method in which attachment circuits
are delivered to the Provider Edge (PE) chassis. For example, a T1 attachment circuit is treated the same way
for all delivery methods, including copper, multiplex in a T3 circuit, a virtual tributary of a SONET circuit,
or unstructured Circuit Emulation Service (CES).
In SAToP mode, the interface is considered as a continuous framed bit stream. The packetization of the stream
is done according to IETF RFC 4553. All signaling is carried out transparently as a part of a bit stream.
Configuring CEM for SAToP
This section provides information about how to configure CEM. CEM provides a bridge between a Time
Division Multiplexing (TDM) network and a packet network, MPLS. The chassis encapsulates the TDM data
in the MPLS packets and sends the data over a CEM pseudowire to the remote Provider Edge (PE) chassis.
The following sections describe how to configure CEM.
Configuring CEM Restriction
•Not all combinations of payload size and dejitter buffer size are supported. If you apply an incompatible
payload size or dejitter buffer size configuration, the chassis rejects it and reverts to the previous
configuration.
•The dummy-pattern command is not supported.
CEM interface does not support idle-cas parameter.
Note
Configuring CEM Group for SAToP for T1 Interfaces
The following section describes how to configure a CEM group for SAToP.
enable
configure terminal
controller t1 0/4/0
cem-group 0 unframed
end
You need metroaggrservice license to configure CEM group on the Interface Module.Note
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Configuring CEM
Structure-Agnostic TDM over Packet

Configuring CEM Classes
A CEM class allows you to create a single configuration template for multiple CEM pseudowires. Follow
these steps to configure a CEM class:
Note •The CEM parameters can be configured either by using CEM class or on CEM interface directly.
•The CEM parameters at the local and remote ends of a CEM circuit must match; otherwise, the
pseudowire between the local and remote PE chassis does not come up.
enable
configure terminal
class cem mycemclass
payload-size 512
dejitter-buffer 12
exit
interface cem 0/0/1
cem 0
cem class mycemclass
xconnect 10.10.10.10 200 encapsulation mpls
exit
Configuring CEM Parameters
The following sections describe the parameters you can configure for CEM circuits.
Configuring Payload Size (Optional)
To specify the number of bytes encapsulated into a single IP packet, use the pay-load size command. The size
argument specifies the number of bytes in the payload of each packet. The range is from 32 to 1312 bytes.
Default payload sizes for an unstructured CEM channel are as follows:
•E1 = 256 bytes
•T1 = 192 bytes
Default payload sizes for a structured CEM channel depend on the number of time slots that constitute the
channel. Payload size (L in bytes), number of time slots (N), and packetization delay (D in milliseconds) have
the following relationship: L = 8*N*D. The default payload size is selected in such a way that the packetization
delay is always 1 millisecond.
The payload size must be an integer of the multiple of the number of time slots for structured CEM channels.
Setting the Dejitter Buffer Size
To specify the size of the dejitter-buffer used to compensate for the network filter, use the dejitter-buffer
command. The configured dejitter-buffer size is converted from milliseconds to packets and rounded up to
the next integral number of packets. Use the size argument to specify the size of the buffer, in milliseconds.
The range is from 1 to 32; the default is 5.
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Configuring CEM
Configuring CEM Classes

Shutting Down a CEM Channel
To shut down a CEM channel, use the shutdown command in CEM configuration mode. The shutdown
command is supported only under CEM mode and not under the CEM class.
Configuring DS1 CT3 SAToP Mode
To configure DS1 CT3 SAToP mode, use the following commands:
enable
configure terminal
controller MediaType 0/4/11
mode sonet
controller sonet 0/5/0
rate oc12
sts-1 1
mode ct3
t1 1cem-group 100 unframed
t1 1framing unframed
interface cem 0/5/0
cem 100
xconnect 2.2.2.2 10 encapsulation mpls
end
Configuring VT DS1 SAToP Mode
To configure VT DS1 SAToP mode, use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
rate oc12
sts-1 1
mode vt-15
vtg 1t1 1framing unframed
vtg 1t1 1cem-group 0 unframed
end
Configuring STS-Nc CEP
To configure STS-Nc CEP, use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
rate oc12
sts-1 1-3mode sts-3c
cem-group 100 cep
interface cem 0/5/0
cem 100
xconnect 2.2.2.2 10 encapsulation mpls
end
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Configuring CEM
Configuring DS1 CT3 SAToP Mode

Configuring CEP
To configure CEP, use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
sts-1 1
mode unframed
cem-group 100 cep
end
Configuring VT-15 CEP
To configure VT-15 CEP, use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
rate oc12
sts-1 1
mode vt-15
vtg 1vt 1cem-group 100 cep
end
Configuring DS3 SAToP
To configure DS3 SAToP, the STS-1 needs to be configured in mode T3. Use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
rate oc12
sts-1 1
mode t3
cem-group 100 unframed
interface cem 0/5/0
cem 100
xconnect 2.2.2.2 10 encapsulation mpls
end
Configuring CEM APS
To configure CEM APS, use the following commands:
enable
configure terminal
controller MediaType 0/5/0
mode sonet
controller sonet 0/5/0
controller sonet-acr acr_no
sts-1 1
vtg 1 t1 1cem-group 100 unframed
end
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Configuring CEM
Configuring CEP

Configuring Unidirectional APS for SAToP
To configure unidirectional ACR (SONET Framing), use the following commands:
enable
configure terminal
controller sonet 0/5/0
clock source internal
aps group acr 1
aps working 1
aps unidirectional
exit
controller sonet 0/5/0
aps group acr 1
aps protect 1 10.7.7.7
aps revert 3
aps adm
end
To restore the system to its default condition, use the no form of the command.Note
Configuring Bi-directional ACR (SONET Framing) for SAToP
To configure bi-directional ACR (SONET Framing), use the following commands:
enable
configure terminal
controller sonet 0/5/0
clock source internal
aps group acr 1
aps working 1
exit
controller sonet 0/4/0
aps group acr 1
aps protect 1 10.7.7.7
end
To restore the system to its default condition, use the no form of the command.Note
Verifying CEM Statistics for SAToP
Use the following commands to verify the pseudowire configuration for SAToP:
•show cem circuit—Displays information about the circuit state, administrative state, the CEM ID of
the circuit, and the interface on which it is configured. If cross connect is configured under the circuit,
the command output also includes information about the attachment circuit status.
Router# show cem circuit
<0-32000> CEM ID
detail Detailed information of cem ckt(s)
interface CEM Interface
summary Display summary of CEM ckts
| Output modifiers
Router# show cem circuit
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Configuring CEM
Verifying CEM Statistics for SAToP