Cisco Unified Communications Manager and Interoperability Guide, Cisco IOS Release 12.4T
Configuring RSVP Agent
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Configuring RSVP Agent

Last Updated: December 14, 2011

The RSVP Agent feature implements a Resource Reservation Protocol (RSVP) agent on Cisco IOS voice gateways that support Cisco Unified Communications Manager Version 5.0.1. The RSVP agent enables Cisco Unified Communications Manager to provide resource reservation for voice and video media to ensure QoS and call admission control (CAC). Cisco Unified Communications Manager controls the RSVP agent through Skinny Client Control Protocol (SCCP). This signaling is independent of the signaling protocol used for the call so SCCP, SIP, H.323, and MGCP calls can all use the RSVP agent.

Benefits of this feature include the following:

  • Improves flexibility and scalability of bandwidth management in a meshed network by decentralizing call admission control
  • Provides method of managing unpredictable bandwidth requirements of video media
  • Enables RSVP across WAN for Cisco IP phones and other devices that do not support RSVP

Feature History for RSVP Agent

Release

Modification

12.4(6)T

This feature was introduced.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn . You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

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 www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for RSVP Agent

Cisco IOS Voice Gateway

  • Cisco IOS Release 12.4(4)T or a later release.
  • Transcoder and MTP services must be configured on the voice gateway. See "Configuring Enhanced Conferencing and Transcoding for Voice Gateway Routers" on page 67 .
  • SCCP must be enabled on the local interface that the voice gateway uses to register with Cisco Unified Communications Manager. See the "Enabling SCCP on the Cisco Unified Communications Manager Interface" section on page 81 .
  • The ip rsvp bandwidth command must be enabled on all interfaces.
  • The ip rsvp policy preempt command must be enabled.
  • The sccp ccm command must use the keyword version 5.0.1.

Cisco Unified Communications Manager

  • Cisco Unified Communications Manager 5.0.1 or a later release.
  • Transcoder and MTP services must be configured in Cisco Unified Communications Manager. See the following chapters in the Cisco Unified Communications Manager Administration Guide :
  • RSVP policy level must be configured in Cisco Unified Communications Manager. See the "Service Parameters Configuration" chapter in the Cisco Unified Communications Manager Administration Guide .

Restrictions for RSVP Agent

  • RSVP agent is not supported by conference devices.
  • RSVP agent is not supported by a hardware MTP or transcoder device using the NM-HDV.
  • RSVP agent is supported by a software MTP using the NM-HDV only if the dsp services dspfarm command is not enabled for the voice card.
  • Lip-sync for video calls is not supported.

Information About RSVP Agent

RSVP Agent

Resource Reservation Protocol (RSVP) is the IP service that allows applications to request end-to-end QoS guarantees from the network. Cisco VoIP applications use RSVP for call admission control, limiting the accepted voice load on the IP network to guarantee the QoS levels of calls. In networks that include both voice and video media, bandwidth requirements can vary considerably over any given time. Cisco Unified Communications Manager ensures resource reservation for voice and video media by using RSVP.

The RSVP agent is a transcoding or MTP device on the Cisco IOS gateway that registers with Cisco Unified Communications Manager as RSVP-capable. The RSVP agent is controlled by Cisco Unified Communications Manager which communicates with the RSVP agent using SCCP.

Cisco Unified Communications Manager consults its policy configuration to determine if RSVP is required for a voice or video call. If the configured QoS level for a call is optional or mandatory, and the RSVP agent is enabled on the voice gateway, Cisco Unified Communications Manager inserts a pair of RSVP agents into the media path to provide RSVP support. The RSVP agent on the Cisco IOS gateway creates the RSVP reservation for the two endpoints and bridges the media connection so that resources are reserved for the media path, providing QoS for the call.

The figure below shows where the RSVP agent fits in a Cisco Unified Communications Manager meshed network.

Figure 1RSVP Agent in Cisco Unified Communications Manager Meshed Network


To support video calls, MTP and transcoding resources can process multiple streams in a single session, including audio, video and data, one-way or two-way, using a pass-through mode. In pass-through mode, a SCCP device processes streams using a pure software MTP, regardless of the type of stream, so it can be used for any stream type. Video and data streams are processed using pass-through mode. Audio streams can be processed with or without pass-through mode.

How to Enable the RSVP Agent on the Voice Gateway


Note
This document does not contain details about configuring Cisco Unified Communications Manager. See the documentation and online help for Cisco Unified Communications Manager for configuration instructions.

Enabling RSVP in a DSP Farm Profile

Perform this procedure to enable the RSVP agent on an MTP or transcoder device.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    dspfarm profile profile-identifier{mtp | transcode}

4.    codec pass-through

5.    maximum sessions {hardware | software} number

6.    associate application sccp

7.    rsvp

8.    no shutdown

9.    end


DETAILED STEPS
 Command or ActionPurpose
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
dspfarm profile profile-identifier{mtp | transcode}

Example:

Router(config)# dspfarm profile 20 transcode

 

Enters DSP farm profile configuration mode to define a profile for DSP farm services.

Note    The profile-identifier and service type uniquely identifies a profile. If the service type and profile-identifier pair is not unique, you are prompted to choose a different profile-identifier .
 
Step 4
codec pass-through


Example:

Router(config-dspfarm-profile)# codec pass-through

 

Enables codec pass-through mode for the DSP farm profile.

  • Codec pass-through must be enabled for the RSVP agent to support Cisco Unified Communications Manager.
  • Transcoder profiles support multiple codecs. MTP profiles support only one codec in addition to pass-through mode. You must define a separate MTP profile for each additional codec.
 
Step 5
maximum sessions {hardware | software} number


Example:

Router(config-dspfarm-profile)# maximum sessions 4

 

Specifies the maximum number of sessions that are supported by the profile.

  • number --Range is determined by the available registered DSP resources. Default is 0.
Note    The hardware and software keywords apply only to MTP profiles.
 
Step 6
associate application sccp


Example:

Router(config-dspfarm-profile)# associate application sccp

 

Associates the SCCP protocol to the DSP farm profile.

 
Step 7
rsvp


Example:

Router(config-dspfarm-profile)# rsvp

 

Enables RSVP support in the DSP farm profile.

 
Step 8
no shutdown


Example:

Router(config-dspfarm-profile)# no shutdown

 

Enables the profile, allocates DSP farm resources, and associates the application.

 
Step 9
end


Example:

Router(config-dspfarm-profile)# end

 

Exits to privileged EXEC mode.

 

What to Do Next

Assign the DSP-farm profile to the appropriate Cisco Unified Communications Manager group. See the "Associating a DSP Farm Profile to a Cisco Unified Communications Manager Group" section on page 85 .

Verifying RSVP Agent Configuration

Perform this procedure to verify the RSVP Agent configuration on the voice gateway.

SUMMARY STEPS

1.    show running-config

2.    show dspfarm profile profile-number

3.    show sccp ccm group group-number


DETAILED STEPS
Step 1   show running-config

Use the show running-config command to verify that the RSVP agent is enabled on the SCCP device and that the device is assigned to a Cisco Unified Communications Manager group:



Example: 
Router# show running-config
!
sccp ccm group 1
 bind interface FastEthernet0/0
 associate ccm 2 priority 3
 associate ccm 1 priority 2
 associate profile 10 register mtp_A1
 associate profile 120 register xcoder_A2
 associate profile 110 register mtp_A2
 associate profile 20 register xcoder_A1
!
dspfarm profile 20 transcode
 codec g711ulaw
 codec gsmfr
 codec g711alaw
 codec g729r8
 codec g729ar8
 codec g729br8
 codec g729abr8
 codec pass-through
 rsvp
 maximum sessions 5
 associate application SCCP
!
Step 2   show dspfarm profile profile-number

Use the show dspfarm profile command to verify the configuration and status of the resource:



Example: 
Router# show dspfarm profile 20
Dspfarm Profile Configuration
 Profile ID = 20, Service = TRANSCODING, Resource ID = 1
 Profile Description :
 Profile Admin State : UP
 Profile Operation State : ACTIVE
 Application : SCCP   Status : ASSOCIATED
 Resource Provider : FLEX_DSPRM   Status : UP
 Number of Resource Configured : 5
 Number of Resource Available : 5
 Codec Configuration
 Codec : gsmfr, Maximum Packetization Period : 20
 Codec : g729abr8, Maximum Packetization Period : 60
 Codec : g711alaw, Maximum Packetization Period : 30
 Codec : g711ulaw, Maximum Packetization Period : 30
 Codec : g729r8, Maximum Packetization Period : 60
 Codec : g729ar8, Maximum Packetization Period : 60
 Codec : g729br8, Maximum Packetization Period : 60
 Codec : pass-through, Maximum Packetization Period : 0
 RSVP : ENABLED
Step 3   show sccp ccm group group-number

Use the show sccp ccm groupcommand to verify the DSP farm profiles that are assigned to the Cisco Unified Communications Manager group and the registration names of the SCCP devices.



Example: 
Router# show sccp ccm group 1
CCM Group Identifier: 1
 Description: None
 Binded Interface: NONE, IP Address: NONE
 Associated CCM Id: 1, Priority in this CCM Group: 2
 Associated CCM Id: 2, Priority in this CCM Group: 3
 Associated Profile: 10, Registration Name: mtp_A1
 Associated Profile: 20, Registration Name: xcoder_A1
 Associated Profile: 110, Registration Name: mtp_A2
 Associated Profile: 120, Registration Name: xcoder_A2
 Registration Retries: 3, Registration Timeout: 10 sec
 Keepalive Retries: 3, Keepalive Timeout: 30 sec
 CCM Connect Retries: 3, CCM Connect Interval: 10 sec
 Switchover Method: GRACEFUL, Switchback Method: GRACEFUL_GUARD
 Switchback Interval: 10 sec, Switchback Timeout: 7200 sec
 Signaling DSCP value: default, Audio DSCP value: default

Troubleshooting the RSVP Agent

You can troubleshoot the performance of the RSVP agent by performing any of the following steps.

SUMMARY STEPS

1.    show sccp

2.    show sccp connections

3.    show sccp connections details

4.    show sccp connections rsvp

5.    show ip rsvp installed

6.    show sccp statistics

7.    debug sccp all

8.    debug call rsvp-sync {events | func-trace}

9.    debug voip ccapi inout


DETAILED STEPS
Step 1   show sccp

Before the start of a call, use the show sccp command to verify that the MTP or transcoder device is successfully registered with Cisco Unified Communications Manager:



Example: 
Router# show sccp
SCCP Admin State: UP 
Gateway IP Address: 192.168.20.1, Port Number: 0
IP Precedence: 5
User Masked Codec list: None
Call Manager: 192.168.20.11, Port Number: 2000
                Priority: N/A, Version: 5.0.1, Identifier: 3
Call Manager: 192.168.20.12, Port Number: 2000
                Priority: N/A, Version: 5.0.1, Identifier: 1
Call Manager: 192.168.20.13, Port Number: 2000
                Priority: N/A, Version: 5.0.1, Identifier: 2
.....
Software MTP Oper State: ACTIVE - Cause Code: NONE
Active Call Manager: 192.168.20.12, Port Number: 2000
TCP Link Status: CONNECTED, Profile Identifier: 10
Reported Max Streams: 1004, Reported Max OOS Streams: 0
Supported Codec: pass-thru, Maximum Packetization Period: N/A
Supported Codec: g711ulaw, Maximum Packetization Period: 30
Supported Codec: rfc2833 dtmf, Maximum Packetization Period: 30
RSVP : ENABLED
Step 2   show sccp connections

During the call, use the show sccp connectionscommand to display information about the active SCCP connections established for the call, the DSP farm service type (MTP or transcoding), codec (for example, pass-through or g711ulaw), and remote end information:



Example: 
Router# show sccp connections
sess_id    conn_id    stype mode     codec   ripaddr         rport sport
17537646   19438263   mtp   sendrecv pass_th 192.168.20.5    35548 16576
17537646   19438260   mtp   sendrecv pass_th 192.168.22.1    16832 19164
Total number of active session(s) 1, and connection(s) 2
Step 3   show sccp connections details

Use the show sccp connections details command to display details about active SCCP connections, including the internal call leg ID:



Example: 
Router# show sccp connections details
bridge-info(bid, cid) - Normal bridge information(Bridge id, Calleg id)
mmbridge-info(bid, cid) - Mixed mode bridge information(Bridge id, Calleg id)
sess_id    conn_id    call-id    codec   pkt-period type      bridge-info(bid, cid)   mmbridge-info(bid, cid)
17537646   -          326        N/A     N/A        swmtpmsp  All RTPSPI Callegs      N/A                    
17537646   19438263   324        pass_th 20         rtpspi    (221,326)               N/A                    
17537646   -          326        N/A     N/A        swmtpmsp  All RTPSPI Callegs      N/A                    
17537646   19438260   325        pass_th 20         rtpspi    (222,326)               N/A                    
Total number of active session(s) 1, connection(s) 2, and callegs 4
Step 4   show sccp connections rsvp

Use the show sccp connections rsvp command to display information about the active RSVP reservations for the call:



Example: 
Router# show sccp connections rsvp
sess_id    conn_id    rsvp_id    dir  local ip       :port  remote ip      :port 
17537646   19438260   -244       SEND 192.168.20.1   :19164 192.168.22.1   :16832
17537646   19438260   -245       RECV 192.168.20.1   :19164 192.168.22.1   :16832
 Total active sessions 1, connections 2, rsvp sessions 2
Step 5   show ip rsvp installed

Use the show ip rsvp installed command to see that the RSVP reservation is successfully made and to display the reserved bandwidth for the call:



Example: 
Router# show ip rsvp installed
RSVP: Loopback0 has no installed reservations
RSVP: FastEthernet0/0 has no installed reservations
RSVP: Serial0/0
BPS    To              From            Protoc DPort  Sport  Weight Conversation
80K    192.168.22.1    192.168.20.1    UDP    16832  19164  25     265   
RSVP: FastEthernet0/1 has no installed reservations
RSVP: Serial0/1 has no installed reservations
Step 6   show sccp statistics

Use the show sccp statisticscommand to display the SCCP messages exchanged between the RSVP agent and Cisco Unified Communications Manager:



Example: 
Router# show sccp statistics
SCCP Application Service(s) Statistics:
Profile Identifier: 10, Service Type: Software MTP
TCP packets rx 9, tx 6
Unsupported pkts rx 0, Unrecognized pkts rx 0
Register tx 0, successful 0, rejected 0, failed 0
KeepAlive tx 1, successful 1, failed 0
OpenReceiveChannel rx 2, successful 2, failed 0
CloseReceiveChannel rx 0, successful 0, failed 0
StartMediaTransmission rx 2, successful 2, failed 0
StopMediaTransmission rx 0, successful 0, failed 0
PortReq rx 1
PortRes tx 1, successful 1, failed 0
PortClose rx 0
QosListen rx 1
QosPath rx 1
QosTeardown rx 0, send 0, recv 0, sendrecv 0
QosResvNotify tx 2, send 2, recv 0, sendrecv 0
QosErrorNotify tx 0, send 0, recv 0, sendrecv 0
   err0 0, err1 0, err2 0, err3 0, err4 0, err5 0,
   err6 0, err7 0, err8 0, err9 0, err10 0, err11 0,
QosModify rx 1, send 0, recv 1, sendrecv 0
UpdateDscp rx 0
Reset rx 0, successful 0, failed 0
MediaStreamingFailure rx 0
Switchover 0, Switchback 0
Step 7   debug sccp all

Use the debug sccp all command to display the sequence of the SCCP messages. The message sequence may be different if the RSVP policy defined in Cisco Unified Communications Manager is not set to mandatory.



Example: 
Router# show sccp statistics
Router# show log | incl (rcvd | txed)
Feb  4 20:28:41.791: sccp_parse_control_msg: rcvd KeepAliveAckMessage msg
Feb  4 20:28:41.803: sccp_parse_control_msg: rcvd KeepAliveAckMessage msg
Feb  4 20:28:41.815: sccp_parse_control_msg: rcvd KeepAliveAckMessage msg
Feb  4 20:28:55.647: sccp_parse_control_msg: rcvd PortReq msg
: 
Feb  4 20:28:55.647: sccp_send_port_res: PortRes
 msg txed in hex(including header) - len 36
Feb  4 20:28:55.651: sccp_parse_control_msg: rcvd QosPath
 msg: 
Feb  4 20:28:55.651: sccp_parse_control_msg: rcvd QosListen
 msg: 
Feb  4 20:28:55.675: sccp_send_qos_resv_notify: QosResvNotify
 txed in hex(including header) - len 36
Feb  4 20:28:57.706: OpenReceviceChannel
 msg rcvd in hex -
Feb  4 20:28:57.710: sccp_open_receive_chnl_ack: OpenRecvChnlAck
 msg txed in hex(including header) - len 32
Feb  4 20:28:57.714: OpenReceviceChannel
 msg rcvd in hex -
Feb  4 20:28:57.718: StartMediaTrans
 msg rcvd in hex -
Feb  4 20:28:57.726: sccp_open_receive_chnl_ack: OpenRecvChnlAck
 msg txed in hex(including header) - len 32
Feb  4 20:28:57.866: StartMediaTrans
 msg rcvd in hex -
Feb  4 20:28:57.870: sccp_parse_control_msg: rcvd QosModify
 msg: 
Feb  4 20:28:57.878: sccp_send_qos_resv_notify: QosResvNotify
 txed in hex(including header) - len 36
Step 8   debug call rsvp-sync {events | func-trace}

Use the debug call rsvp-sync event and debug call rsvp-sync func-trace with the debug sccp all command to show how SCCP messages and RSVP events trigger each other.

Step 9   debug voip ccapi inout

Use the debug voip ccapi inoutcommand to trace the execution path through the call control application programming interface (API).

Configuration Examples for RSVP Agent

RSVP Agent Example

version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
logging buffered 5000000 debugging
no logging console
enable password lab
!
no network-clock-participate slot 2 
no network-clock-participate aim 0 
no network-clock-participate aim 1 
no aaa new-model
ip subnet-zero
ip cef
!
!
no ip domain lookup
no ftp-server write-enable
voice-card 2
 dspfarm
 dsp services dspfarm
!
!
!
interface Loopback0
 ip address 192.168.26.1 255.255.255.255
 max-reserved-bandwidth 100
 ip rsvp bandwidth
!
interface FastEthernet0/0
 ip address 192.168.20.1 255.255.255.0
 max-reserved-bandwidth 100
 duplex auto
 speed auto
 fair-queue 64 256 1000
 ip rsvp bandwidth
!
interface Serial0/0
 ip address 192.168.25.2 255.255.255.252
 max-reserved-bandwidth 100
 fair-queue 64 256 37
 ip rsvp bandwidth
!
interface FastEthernet0/1
 ip address 192.168.24.1 255.255.255.0
 max-reserved-bandwidth 100
 shutdown
 duplex auto
 speed auto
 fair-queue 64 256 1000
 ip rsvp bandwidth
!
interface Serial0/1
 ip address 192.168.25.69 255.255.255.252
 max-reserved-bandwidth 100
 shutdown
 fair-queue 64 256 37
 ip rsvp bandwidth
!
router ospf 10
 log-adjacency-changes
 network 192.168.0.0 0.0.255.255 area 0
!
ip classless
ip http server
ip rsvp policy preempt
!
!
!
control-plane
!
!
!
voice-port 2/0/0
!
voice-port 2/0/1
!
!
sccp local FastEthernet0/0
sccp ccm 192.168.20.11 identifier 3 version 4.0 
sccp ccm 192.168.20.13 identifier 2 version 5.1 
sccp ccm 192.168.20.12 identifier 1 version 5.1 
sccp
!
sccp ccm group 1
 bind interface FastEthernet0/0
 associate ccm 2 priority 3
 associate ccm 1 priority 2
 associate profile 10 register mtp_A1
 associate profile 120 register xcoder_A2
 associate profile 110 register mtp_A2
 associate profile 20 register xcoder_A1
!
dspfarm profile 20 transcode
 codec g711ulaw
 codec gsmfr
 codec pass-through
 codec g711alaw
 codec g729r8
 codec g729ar8
 codec g729br8
 codec g729abr8
 rsvp
 maximum sessions 5
 associate application SCCP
!
dspfarm profile 120 transcode
 codec g729abr8
 codec gsmfr
 codec g711alaw
 codec g711ulaw
 codec g729r8
 codec g729ar8
 codec g729br8
 codec pass-through
 rsvp
 maximum sessions 5
 associate application SCCP
!
dspfarm profile 30 conference
 codec g711ulaw
 codec g711alaw
 codec g729ar8
 codec g729abr8
 codec g729r8
 codec g729br8
!
dspfarm profile 10 mtp
 codec g711ulaw
 codec pass-through
 rsvp
 maximum sessions hardware 2
 maximum sessions software 10
 associate application SCCP
!
dspfarm profile 110 mtp
 codec pass-through
 codec g711ulaw
 rsvp
 maximum sessions hardware 2
 maximum sessions software 10
 associate application SCCP
!
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
 exec-timeout 0 0
 no login
!
ntp clock-period 17175018
ntp server 192.168.20.12
end

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© 2011 Cisco Systems, Inc. All rights reserved.

© 2011 Cisco Systems, Inc. All rights reserved.