Cisco IOS IP SLAs Configuration Guide, Release 12.4T - IP SLAs -- Analyzing VoIP Service Levels Using the Gatekeeper Registration Delay Operation [Cisco IOS Software Releases 12.4 T]

Table Of Contents

IP SLAs—Analyzing VoIP Service Levels Using the Gatekeeper Registration Delay Operation

Contents

Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation

Information About the IP SLAs VoIP Gatekeeper Registration Delay Operation

H.323, Gatekeepers, and Gateways

Gateway-to-Gatekeeper Registration Delay Time Monitoring

How to Configure the IP SLAs VoIP Gatekeeper Registration Delay Operation

Configuring the VoIP H.323 Gateway

Prerequisites

Examples

Troubleshooting Tips

What to Do Next

Configuring and Scheduling the IP SLAs VoIP Gatekeeper Registration Delay Operation

Prerequisites

Troubleshooting Tips

What to Do Next

Configuration Examples for the IP SLAs VoIP Gatekeeper Registration Delay Operation

Configuring the IP SLAs VoIP gatekeeper registration delay operation: Example

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Glossary

Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation

IP SLAs—Analyzing VoIP Service Levels Using the Gatekeeper Registration Delay Operation

First Published: August 14, 2006

Last Updated: July 31, 2008

This document describes how to use the Cisco IOS IP Service Level Agreements (SLAs) VoIP gatekeeper registration delay operation to determine the average, median, or aggregated response time (delay) of registration attempts from a Voice over IP (VoIP) gateway to a VoIP gatekeeper device.

To measure VoIP gatekeeper registration response time, the gatekeeper registration delay operation functions by sending a lightweight Registration Request (RRQ) from an H.323 gateway (GW) to an H.323 gatekeeper (GK), and recording the amount of time taken to receive the Registration Confirmation (RCF) back from the gatekeeper.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation

•Information About the IP SLAs VoIP Gatekeeper Registration Delay Operation

•How to Configure the IP SLAs VoIP Gatekeeper Registration Delay Operation

•Configuration Examples for the IP SLAs VoIP Gatekeeper Registration Delay Operation

•Where to Go Next

•Additional References

•Glossary

•Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation

Restrictions for the IP SLAs VoIP Gatekeeper Registration Delay Operation

You cannot configure the IP SLAs VoIP gatekeeper registration delay operation if the gatekeeper has already been registered with the gateway.

Information About the IP SLAs VoIP Gatekeeper Registration Delay Operation

To configure the IP SLAs VoIP gateway registration delay operation, you should understand the following concepts:

•H.323, Gatekeepers, and Gateways

•Gateway-to-Gatekeeper Registration Delay Time Monitoring

H.323, Gatekeepers, and Gateways

H.232 is the ITU-T protocol standard used for managing and facilitating packetized voice and video over local-area networks (LANs, particularly intranets) and over the Internet. H.323 consists of several component standards; see the "Glossary" section for details on these standardized protocols.

H.323 is considered an "umbrella protocol" because it defines all aspects of call transmission, from call establishment to capabilities exchange to network resource availability. H.323 defines Registration, Admission, and Status (RAS) protocols for call routing, H.225 protocols for call setup, and H.245 protocols for capabilities exchange. The IP SLAs VoIP Gatekeeper Registration Delay Monitoring feature focuses on the function of the call control H.323 stack.

For an in-depth discussion of H.323, including gatekeeper and gateway functionality, see the "H.323 Applications" chapter (part of the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2) [ http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fvvfax_c/index.htm ].

Gateway-to-Gatekeeper Registration Delay Time Monitoring

The IP SLAs VoIP gatekeeper registration delay operation provides statistical data on the amount of time taken to register a gateway to a gatekeeper. IP SLAs was designed to gather information over time, at intervals you specify, so that statistics can be provided on key metrics often used in Service Level Agreements (SLAs). Aggregated totals, median, or average data can be viewed using the Cisco IOS command-line interface (CLI) on the device running IP SLAs, or retrieved from the device by external applications using SNMP.

Cisco IOS IP SLAs also provides notification options based on performance thresholds and reaction triggering. These notification options allow for proactive monitoring in an environment where IT departments can be alerted to potential network problems, rather than having to manually examine data.

For further information on these functions, see the Cisco IOS IP SLAs Monitoring Technology Configuration Guide.

This operation will measure time from when the RRQ message is sent and when RCF message is received. A timeout may be required if a response is not received in a certain timeframe.

How to Configure the IP SLAs VoIP Gatekeeper Registration Delay Operation

This section contains the following procedures:

•Configuring the VoIP H.323 Gateway

•Configuring and Scheduling the IP SLAs VoIP Gatekeeper Registration Delay Operation

Configuring the VoIP H.323 Gateway

Check the registration status of the gateway to a gatekeeper using the show gateway command. If the gateway is not registered, perform the task described in this section.

Prerequisites

Prior to configuring the IP SLAs VoIP gatekeeper registration delay operation, the gatekeeper must be enabled and the gateway must be preregistered. As a best practice, you should confirm the gatekeeper and gateway status first.

If the gateway is not registered, select an interface and configure the gatekeeper in the gateway.

SUMMARY STEPS

1. enable

2. configure terminal

3. gateway

4. exit

5. interface interface-id

6. ip address ip-address subnet-mask

7. h323-gateway voip interface

8. h323-gateway voip id gatekeeper-id {ipaddr ip-address [port-number] | multicast}[priority number]

9. h323-gateway voip h323-id interface-id

10. exit

DETAILED STEPS

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

gateway
Example:

Router(config)# gateway

Enables the H.323 VoIP gateway and enters gateway configuration mode.

Step 4

exit
Example:

Router(config-gateway)# exit

Exits gateway configuration mode and returns to global configuration mode.

Step 5

interface interface-id
Example:

Router(config)# interface Ethernet1/1

Specifies an interface and enters interface configuration mode.

Step 6

ip address ip-address subnet-mask
Example:

Router(config-if)# ip address 172.29.129.123 255.255.255.0

Configures the IP address of the interface.

Step 7

h323-gateway voip interface
Example:

Router(config-if)# h323-gateway voip interface

Configures the interface as an H.323 gateway interface.

Step 8

h323-gateway voip id gatekeeper-id {ipaddr ip-address [port-number] | multicast}
[priority number]
Example:

Router(config-if)# h323-gateway voip id zone1 ipaddr 172.29.129.124 1719
Router(config-if)# h323-gateway voip id saagk ipaddr 172.29.129.28 1719

Defines the name and location of the gatekeeper for a specific gateway.

•Repeat as needed for multiple IDs (see example).

Step 9

h323-gateway voip h323-id interface-id
Example:

Router(config-if)# h323-gateway voip h323-id GWZ

Configures the H.323 name of the gateway that identifies this gateway to its associated gatekeeper.

Step 10

exit
Example:

Router(config-if)# exit

(Optional) Exits interface configuration mode and returns to privileged EXEC mode.

Examples

Use the show gateway command to verify the registration status of the gateway to a gatekeeper.

The following example shows sample output from the show gateway command if the gateway (named GW3) is registered to a gatekeeper (named slagk):
Router# show gateway
H.323 ITU-T Version: 4.0   H323 Stack Version: 0.1 
 H.323 service is up
 Gateway  GW3 is registered to Gatekeeper slagk
Alias list (CLI configured) 
 E164-ID 2073418
 E164-ID 5251212
 H323-ID GW3
Alias list (last RCF) 
 E164-ID 2073418
 E164-ID 5251212
 H323-ID GW3
    H323 resource thresholding is Disabled
The following example shows sample output for the show gateway command if the gateway is not registered to a gatekeeper:
Router# show gateway
 Gateway gw3 is not registered to any gatekeeper
Alias list (CLI configured) 
 E164-ID 2073418
 E164-ID 5251212
 H323-ID gw3/ww
Alias list (last RCF) 
    H323 resource thresholding is Disabled
Use the show gatekeeper endpoint command to verify the endpoint's registration status to the gatekeeper. The following example shows the common output of this command if an endpoint is registered:
Router# show gatekeeper endpoint
            GATEKEEPER ENDPOINT REGISTRATION
            ================================
CallSignalAddr   Port   RASSignalAddr   Port   Zone Name   Type   Flags 
--------------   -----  -------------   ----   ---------   ----   ----- 
172.16.13.35     1720   172.16.13.35    50890  gk          VOIP-GW 
    E164-ID: 2073418
    E164-ID: 5251212
    H323-ID: gw3
   Total number of active registrations = 1
The following example shows the common output of the show gatekeeper endpoint command if an endpoint is not registered:
Router# show gatekeeper endpoint
            GATEKEEPER ENDPOINT REGISTRATION
            ================================
CallSignalAddr   Port   RASSignalAddr   Port   Zone Name   Type   Flags 
--------------   -----  -------------   ----   ---------   ----   ----- 
   Total number of active registrations = 0
The following configuration example shows a properly configured gateway:
gateway
interface Ethernet1/1
 ip address 172.29.129.123 255.255.255.0
 h323-gateway voip interface
 h323-gateway voip id zone1 ipaddr 172.29.129.124 1719
 h323-gateway voip id saagk ipaddr 172.29.129.28 1719
 h323-gateway voip h323-id GWZ
Troubleshooting Tips

If there appears to be registration issues, see the Troubleshooting Gatekeeper Registration Issues technical assistance document for suggestions on resolving the issue.

http://www.cisco.com/warp/public/788/voip/gk-reg-issues.html

What to Do Next

Configure and schedule the IP SLAs VoIP gatekeeper registration delay operation.

Configuring and Scheduling the IP SLAs VoIP Gatekeeper Registration Delay Operation

Perform this task to begin gathering IP SLAs VoIP gatekeeper registration delay data.

Prerequisites

Prior to configuring the IP SLAs VoIP gatekeeper registration delay operation, the gatekeeper must be enabled and the gateway must be preregistered. As a best practice, you should confirm the gatekeeper and gateway status first.

If the gateway is not registered, select an interface and configure the gatekeeper in the gateway.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip sla operation-number

4. voip delay gatekeeper-registration

5. history buckets-kept size

6. history distributions-of-statistics-kept size

7. history enhanced [interval seconds] [buckets number-of-buckets]

8. history filter {none | all | overThreshold | failures}

9. frequency seconds

10. history hours-of-statistics-kept hours

11. history lives-kept lives

12. owner owner-id

13. history statistics-distribution-interval milliseconds

14. tag text

15. threshold milliseconds

16. timeout milliseconds

17. verify-data

18. exit

19. ip sla schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss] [ageout seconds] [recurring]

20. exit

21. show ip sla configuration [operation-number]

DETAILED STEPS
Command or Action

Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.

•Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
ip sla operation-number
Example:
Router(config)# ip sla 10
Begins configuration for an IP SLAs operation and enters IP SLA configuration mode.
Step 4

voip delay gatekeeper-registration
Example:

Router(config-ip-sla)# voip delay gatekeeper-registration

Configures the IP SLAs operation as a VoIP gatekeeper registration delay operation and enters IP SLA VoIP configuration mode.

•If the gatekeeper has not been registered with the gateway prior to entering this command, the following error message will be displayed:

No gatekeeper has been registered!

Step 5

history buckets-kept size
Example:

Router(config-ip-sla-voip)# history buckets-kept 25

(Optional) Sets the number of history buckets that are kept during the lifetime of an IP SLAs operation.

Step 6

history distributions-of-statistics-kept size
Example:

Router(config-ip-sla-voip)# history distributions-of-statistics-kept 5

(Optional) Sets the number of statistics distributions kept per hop during an IP SLAs operation.

Step 7

history enhanced [interval seconds] [buckets number-of-buckets]
Example:

Router(config-ip-sla-voip)# history enhanced interval 900 buckets 100

(Optional) Enables enhanced history gathering for an IP SLAs operation.

Step 8

history filter {none | all | overThreshold | failures}
Example:

Router(config-ip-sla-voip)# history filter failures

(Optional) Defines the type of information kept in the history table for an IP SLAs operation.

Step 9

frequency seconds
Example:

Router(config-ip-sla-voip)# frequency 30

(Optional) Sets the rate at which a specified IP SLAs operation repeats.

Step 10

history hours-of-statistics-kept hours
Example:

Router(config-ip-sla-voip)# history hours-of-statistics-kept 4

(Optional) Sets the number of hours for which statistics are maintained for an IP SLAs operation.

Step 11

history lives-kept lives
Example:

Router(config-ip-sla-voip)# history lives-kept 5

(Optional) Sets the number of lives maintained in the history table for an IP SLAs operation.

Step 12

owner owner-id
Example:

Router(config-ip-sla-voip)# owner admin

(Optional) Configures the Simple Network Management Protocol (SNMP) owner of an IP SLAs operation.

Step 13

history statistics-distribution-interval milliseconds
Example:

Router(config-ip-sla-voip)# history statistics-distribution-interval 10

(Optional) Sets the time interval for each statistics distribution kept for an IP SLAs operation.

Step 14

tag text
Example:

Router(config-ip-sla-voip)# tag TelnetPollServer1

(Optional) Creates a user-specified identifier for an IP SLAs operation.

Step 15

threshold milliseconds
Example:

Router(config-ip-sla-voip)# threshold 10000

(Optional) Sets the upper threshold value for calculating network monitoring statistics created by an IP SLAs operation.

Step 16

timeout milliseconds
Example:

Router(config-ip-sla-voip)# timeout 10000

(Optional) Sets the amount of time an IP SLAs operation waits for a response from its request packet.

Step 17

verify-data
Example:

Router(config-ip-sla-voip)# verify-data

(Optional) Causes an IP SLAs operation to check each reply packet for data corruption.

Step 18

exit
Example:

Router(config-ip-sla-voip)# exit

Exits VoIP configuration submode and returns to global configuration mode.
Step 19
ip sla schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss] [ageout seconds] [recurring]
Router(config)# ip sla schedule 5 start-time now life forever
Configures the scheduling parameters for an individual IP SLAs operation.
Step 20

exit
Example:

Router(config)# exit

(Optional) Exits global configuration mode and returns to privileged EXEC mode.

Step 21

show ip sla configuration [operation-number]
Example:

Router# show ip sla configuration 10

(Optional) Displays configuration values including all defaults for all IP SLAs operations or a specified operation.
Troubleshooting Tips

•If the IP SLAs operation is not running and generating statistics, add the verify-data command to the configuration of the operation (while configuring in IP SLA configuration mode) to enable data verification. When enabled, each operation response is checked for corruption. Use the verify-data command with caution during normal operations because it generates unnecessary overhead.

•Use the debug ip sla trace and debug ip sla error commands to help troubleshoot issues with an IP SLAs operation.

What to Do Next

To view and interpret the results of an IP SLAs operation use the show ip sla statistics command. Checking the output for fields that correspond to criteria in your service level agreement will help you determine whether the service metrics are acceptable.

Configuration Examples for the IP SLAs VoIP Gatekeeper Registration Delay Operation

This section contains the following configuration example:

•Configuring the IP SLAs VoIP gatekeeper registration delay operation: Example

Configuring the IP SLAs VoIP gatekeeper registration delay operation: Example

In the following example, a VoIP gatekeeper registration delay operation is configured and scheduled to start immediately. This example assumes the gateway to gatekeeper relationship has already been configured.
Router# configure terminal
Router(config)# ip sla 1
Router(config-ip-sla)# voip delay gatekeeper-registration
Router(config-ip-sla-voip)# exit
Router(config)# ip sla schedule 1 start-time now life forever
Where to Go Next

For information about other types of IP SLAs operations and IP SLAs features, see the Cisco IOS IP SLAs Features Roadmap.

Additional References

The following sections provide references related to the IP SLAs VoIP gatekeeper registration delay operation.

Related Documents

Related Topic

Document Title

Cisco IOS IP SLAs command-line interface enhancements

Cisco IOS IP Service Level Agreements Command Line Interface, Cisco white paper

Cisco IOS IP SLAs commands

Cisco IOS IP SLAs Command Reference

Gateway and gatekeeper configuration using Cisco IOS Release 12.3 and later releases

Cisco IOS Voice Configuration Library

http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/cisco_ios_voice_configuration_library_glossary/vcl.htm

Troubleshooting gatekeeper configurations

Troubleshooting Gatekeeper Registration Issues (Tech Note document)

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a008011221e.shtml

Standards

Standard

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—

MIBs

MIB

MIBs Link

CISCO-RTTMON-MIB

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—

Technical Assistance

Description

Link

The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport

Glossary

Gatekeepers—Network devices that help to facilitate and control H.323-based voice and video communications across networks. Gatekeepers are responsible for providing address translation between LAN aliases and IP addresses, call control and routing services to H.323 endpoints, system management, and security policies. These services provided by the gatekeeper in communicating between H.323 endpoints are defined in RAS.

Gateways—Network devices that provide translation between circuit-switched networks (particularly, H.320 ISDN) and packet-based networks (for example, H.323 LANs), allowing endpoints in networks with different transmission formats, codecs, and protocols to communicate.

H.225.0—Protocol standard that defines the establishment and disconnection of H.323 calls.

H.225.0 RAS—H.225.0 Registration/Admission/Status. Standard that facilitates communication between H.323 gateways (endpoints) and H.323 gatekeepers.

H.235—Protocol standard that defines security solutions for H.323 protocols (Q.931, H.245, RAS, Streams). H.235 was formerly called H.SECURE.

H.245—Protocol standard that defines connection management and negotiation capabilities between H.323 devices on the network once the call is established by Q.931.

H.323—An ITU protocol standard for the transmission of real-time audio (Voice/VoIP), video (for example, videoconferencing), and data information over packet switching-based networks. Such networks include IP-based (including the Internet) networks, Internet packet exchange-based local-area networks (LANs), enterprise networks and metropolitan and wide-area networks (WANs). H.323 can also be applied to multipoint multimedia communications. H.323 defines a distributed architecture for IP telephony applications, including multimedia, video conferencing, video over the Internet, and VoIP.

Q.931—Protocol standard that defines the establishment and disconnection of H.323 calls.

RTP/RTCP—Real-time Protocol/Real-Time Control Protocol serves as the standardized means for transmitting and receiving audio and video streams across the network once the call is established.

VoIP—Voice or Video over Internet Protocol. Sometimes used to refer to all IP telephony applications.

Note See Internetworking Terms and Acronyms for terms not included in this glossary.

Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for the IP SLAs VoIP Gatekeeper Registration Delay Operation

Feature Name

Releases

Feature Information

IP SLAs VoIP Gatekeeper Delay Monitoring

12.3(14)T

The Cisco IOS IP SLAs Voice over IP (VoIP) gatekeeper registration delay operation allows you to measure the average, median, or aggregated network response time of registration attempts from a VoIP gateway to a VoIP gatekeeper device.

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