DEPI Latency
Measurement
This document 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
- Information about DEPI Latency Measurement
- How to Configure DLM
- Example: DLM Configuration
- Feature Information for DLM
Hardware Compatibility Matrix for Cisco Remote PHY Device
 Note | The hardware components introduced in a given Cisco Remote PHY Device Software Release are supported in all subsequent releases unless otherwise specified. |
Information about 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 DLM
This section describes how to configure DLM on Cisco cBR-8.
Configuring DLM
To configure DLM, complete the following procedure. DLM is disabled by default, only enabled when configured.
configure terminal cable rpd name core-interface interface_name network-delay dlm interval_in_seconds
Verifying DLM Configuration
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)
x------------x------------
0 491
1 496
2 485
3 492
4 499
5 505
6 477
7 474
8 478
9 471
The table below shows descriptions for the fields displayed by this command:
|
Field |
Description |
|---|---|
|
Last Average DLM |
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. |
Example: DLM Configuration
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
Feature 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.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
DEPI Latency Measurement |
Cisco 1x2 RPD Software 1.1 |
This feature was introduced on the Cisco cBR Series Converged Broadband Routers. |
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