describes how to configure the DEPI latency measurement on the Cisco cBR Series
Converged Broadband Router.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
Hardware Compatibility Matrix for Cisco Remote PHY Device
The hardware components introduced in a given Cisco Remote PHY Device Software Release are supported in all subsequent releases unless otherwise specified.
Table 1 Hardware Compatibility Matrix for the Cisco Remote PHY Device
Cisco HFC Plaform
Remote PHY Device
Cisco GS7000 Node
Cisco 1x2 RPD Software 1.1 and Later Releases
Cisco Remote PHY Device 1x2
DEPI Latency Measurement
The DEPI Latency
Measurement (DLM) packet is a specific type of data packet used for measuring
the network latency between the CCAP core and the RPD. There are two types of
DLM packets, ingress DLM packet and egress DLM packet. The ingress DLM measures
the latency between the CCAP core and the ingress point in the RPD, and the
egress DLM measures the latency between the CCAP core and the egress point of
the RPD. For now, only the ingress DLM is supported. Egress DLM will be
supported in the future if required.
How to Configure
describes how to configure DLM on Cisco cBR-8.
To configure DLM,
complete the following procedure. DLM is disabled by default, only enabled when
cable rpd name
network-delay dlm interval_in_seconds
To verify the DLM
configuration, use the
show cable rpd
dlm command as shown in the example below:
Router# show cable rpd 0000.bbaa.0002 dlm
Load for five secs: 4%/1%; one minute: 4%; five minutes: 4%
Time source is NTP, 13:12:36.253 CST Sun Jan 1 2017
DEPI Latency Measurement (ticks) for 0000.bbaa.0002
Last Average DLM: 4993
Average DLM (last 10 samples): 4990
Max DLM since system on: 5199
Min DLM since system on: 4800
Sample # Latency (usecs)
The table below
shows descriptions for the fields displayed by this command:
Table 2 show cable rpd
dlm Field Descriptions
It means the
last time average DLM (AD). At first, the Last Average DLM (LAD) is always 0,
when the absolute value of (LAD - AD) exceeds or equal to 75us, LAD will be
updated to be the value of AD, MAP advance triggered to update, AD will keep
updating with the last (latest) 10 samples.
The following example shows how to configure DLM:
Router# configure terminal
Router(config)#cable rpd 1
Router(config-rpd)#core-interface tenGigabitEthernet 3/1/0
Router(config-rpd-core)#network-delay dlm 10
Information for DLM
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 3 Feature
Information for DLM
Cisco 1x2 RPD Software 1.1
feature was introduced on the Cisco cBR Series Converged Broadband Routers.