RSVP over UDP

The Resource Reservation Protocol (RSVP) over UDP feature provides the capability for routers to enable neighbor routers to process and send RSVP control packets over UDP. With the implementation of the RSVP over UDP feature, the RSVP protocol stack is enhanced to support processing of RSVP control messages over UDP and raw IP.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 module.

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 Over UDP

  • You must enable RSVP before you enable the RSVP over UDP feature.

  • The RSVP stack running on the client host must support sending and receiving the RSVP control messages with the first hop routers they are connected to.

Information About RSVP over UDP

RSVP over UDP

The RSVP over UDP feature addresses the following scenarios:

  • A router intends to communicate to the first hop router over UDP but not raw IP.

  • A firewall that is located in between two routers drops raw IP packets due to security concerns, but allows UDP packets.

How to Configure RSVP over UDP

Enabling RSVP

This task starts RSVP and sets the bandwidth and single-flow limits. By default, RSVP is disabled so that it is backward compatible with systems that do not implement RSVP. To enable RSVP for IP on an interface, perform the following task.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    ip rsvp bandwidth [interface-bandwidth [percent percent-bandwidth | [single-flow-bandwidth] [sub-pool bandwidth]]]

    5.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 interface type number


    Example:
    Device(config)# interface fastethernet 0/1
     

    Configures the specified interface and enters interface configuration mode.

     
    Step 4 ip rsvp bandwidth [interface-bandwidth [percent percent-bandwidth | [single-flow-bandwidth] [sub-pool bandwidth]]]


    Example:
    Device(config-if)# ip rsvp bandwidth 23 54
     

    Enables RSVP for IP on an interface.

     
    Step 5 end


    Example:
    Device(config-if)# end
     

    Exits interface configuration mode and returns to privileged EXEC mode.

     

    Configuring RSVP over UDP

    To enable RSVP over UDP, perform the following task:

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    ip rsvp udp neighbor neighbor-IP-address router [vrf vrf-name]

      4.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2configure terminal


      Example:
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3ip rsvp udp neighbor neighbor-IP-address router [vrf vrf-name]


      Example:
      Device(config)# ip rsvp udp neighbor 10.1.1.1 router vrf vrf-1
       

      Configures the RSVP over UDP feature for the neighbor router.

       
      Step 4 end


      Example:
      Device(config)# end
       

      Returns to privileged EXEC mode.

       

      Configuration examples for RSVP over UDP

      Example: Enabling RSVP

      The following example shows how to enable RSVP for IP on an interface: 

      enable
 configure terminal
 interface  fastethernet 0/1
  ip rsvp bandwidth 23 54
  end

      Example: Configuring RSVP over UDP

      The following example shows how to configure the RSVP over UDP feature on a neighbor router: 

      enable
 configure terminal
 ip rsvp udp neighbor 10.1.1.1 router vrf vrf-1 
 end

      Additional References

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Master Command List, All Releases

      RSVP commands

      Quality of Service Solutions Command Reference

      Overview on RSVP

      Signaling Overview

      Standards and RFCs

      Standard/RFC

      Title

      RFC 2205

      RSVP—Version 1 Function Specification

      RFC 2209

      RSVP—Version 1 Message Processing Rules

      Technical Assistance

      Description

      Link

      The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

      http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

      Feature Information for RSVP over UDP

      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 1 Feature Information for RSVP over UDP

      Feature Name

      Releases

      Feature Information

      RSVP over UDP

      15.2(4)M

      15.4(1)S

      XE 3.11.0 S

      The RSVP over UDP feature allows a router to enable a neighbor router to process and send RSVP control packets over UDP.

      The following commands were introduced or modified: ip rsvp udp neighbor.