Configuring Cem Classes - Cisco ASR 900 Series Configuration Manual

Configuring CEM

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
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.
pseudowire between the local and remote PE chassis does not come up.
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
Configuring CEM Classes
ASR 900 Series)
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