Control Plane DSCP Support for RSVP

Table Of Contents

Control Plane DSCP Support for RSVP

Contents

Prerequisites for Control Plane DSCP Support for RSVP

Restrictions for Control Plane DSCP Support for RSVP

Information About Control Plane DSCP Support for RSVP

Feature Overview of Control Plane DSCP Support for RSVP

Benefits of Control Plane DSCP Support for RSVP

How to Configure Control Plane DSCP Support for RSVP

Enabling RSVP on an Interface

Specifying the DSCP

Verifying the Configuration

Examples

Configuration Examples for Control Plane DSCP Support for RSVP

Configuring a DSCP: Example

Verifying Control Plane DSCP Support for RSVP: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

ip rsvp signalling dscp

show ip rsvp interface

Glossary

Control Plane DSCP Support for RSVP

First Published: June 7, 2001

Last Updated: February 19, 2007

The Control Plane DSCP Support for RSVP feature lets you prioritize Resource Reservation Protocol (RSVP) messages to improve delivery by decreasing the likelihood of high priority messages being dropped.

History for the Control Plane DSCP Support for RSVP Feature

Release

Modification

12.2(2)T

This feature was introduced.

12.2(18)SXF2

This feature was integrated into Cisco IOS Release 12.2(18)SXF2.

12.2(33)SRB

This feature was integrated into Cisco IOS Release 12.2(33)SRB.

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

•Prerequisites for Control Plane DSCP Support for RSVP

•Restrictions for Control Plane DSCP Support for RSVP

•Information About Control Plane DSCP Support for RSVP

•How to Configure Control Plane DSCP Support for RSVP

•Configuration Examples for Control Plane DSCP Support for RSVP

•Additional References

•Command Reference

•Glossary

Prerequisites for Control Plane DSCP Support for RSVP

The network must support RSVP before you can enable the Control Plane DSCP Support for RSVP feature.

Restrictions for Control Plane DSCP Support for RSVP

You can configure the Control Plane DSCP Support for RSVP feature on interfaces and subinterfaces only. This feature affects all RSVP messages that are sent out the interface or that are on any logical circuit of the interface, including subinterfaces, permanent virtual circuits (PVCs), and switched virtual circuits (SVCs).

Information About Control Plane DSCP Support for RSVP

To use the Control Plane DSCP Support for RSVP feature, you need to understand the following concepts:

•Feature Overview of Control Plane DSCP Support for RSVP

•Benefits of Control Plane DSCP Support for RSVP

Feature Overview of Control Plane DSCP Support for RSVP

Typically, networks operate on a best-effort delivery basis, which means that all traffic has equal priority and an equal chance of being delivered in a timely manner. When congestion occurs, all traffic has an equal chance of being dropped.

Before traffic can be handled according to its unique requirements, it must be identified or labeled (that is, classified). There are numerous classification techniques for doing this. These include Layer 3 schemes such as IP precedence or the differentiated services code point (DSCP), Layer 2 schemes such as 802.1P, and implicit characteristics of the data itself, such as the traffic type using the Real-Time Transport Protocol (RTP) and a defined port range.

The Control Plane DSCP Support for RSVP feature allows you to set the priority value in the type of service (ToS) byte/differentiated services (DiffServ) field in the Internet Protocol (IP) header for RSVP messages. The IP header functions with resource providers such as weighted fair queueing (WFQ), so that voice frames have priority over data fragments and data frames. When packets arrive in a router's output queue, the voice packets are placed ahead of the data frames.

Figure 1 shows a path message originating from a sender with a DSCP value of 0 (the default) that is changed to 5 to give the message a higher priority and a reservation (resv) message originating from a receiver with a DSCP of 3.

Figure 1 Control Plane DSCP Support for RSVP

Raising the DSCP value reduces the possibility of packets being dropped, thereby improving call setup time in VoIP environments.

Benefits of Control Plane DSCP Support for RSVP

Faster Call Setup Time

The Control Plane DSCP Support for RSVP feature allows you to set the priority for RSVP messages. In a DiffServ QoS environment, higher priority packets get serviced before lower priority packets, thereby improving the call setup time for RSVP sessions.

Improved Message Delivery

During periods of congestion, routers drop lower priority traffic before they drop higher priority traffic. Since RSVP messages can now be marked with higher priority, the likelihood of these messages being dropped is significantly reduced.

Faster Recovery After Failure Conditions

When heavy congestion occurs, many packets are dropped. Network resources attempt to retransmit almost instantaneously resulting in further congestion. This leads to a considerable reduction in throughput.

Previously, RSVP messages were marked best effort and subject to being dropped by congestion avoidance mechanisms such as weighted random early detection (WRED). However, with the Control Plane DSCP Support for RSVP feature, RSVP messages are likely to be dropped later, if at all, thereby providing faster recovery of RSVP reservations.

How to Configure Control Plane DSCP Support for RSVP

This section contains the following procedures:

•Enabling RSVP on an Interface (required)

•Specifying the DSCP (required)

•Verifying the Configuration (optional)

Enabling RSVP on an Interface

Perform this task to enable RSVP on an interface.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number [name-tag]

4. ip rsvp bandwidth [interface-kbps] [single-flow-kbps]

5. end

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

interface type number [name-tag]
Example:

Router(config)# interface Ethernet0/0

Configures the interface type and enters interface configuration mode.

•The optional name-tag argument specifies the logic name to identify the server configuration so that multiple server configurations can be entered.

Note This optional argument is for use with the Redundant Link Manager (RLM) feature.

Step 4

ip rsvp bandwidth [interface-kbps] [single-flow-kbps]
Example:

Router(config-if)# ip rsvp bandwidth 7500 7500

Enables RSVP on an interface.

•The optional interface-kbps and single-flow-kbps arguments specify the amount of bandwidth that can be allocated by RSVP flows or to a single flow, respectively. Values are from 1 to 10,000,000.

Note Repeat this command for each interface that you want to enable.

Step 5

end
Example:

Router(config-if)# end

(Optional) Exits to privileged EXEC mode.

Specifying the DSCP

Perform this task to specify the DSCP.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number [name-tag]

4. ip rsvp signalling dscp value

5. end

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

interface type number [name-tag]
Example:

Router(config)# interface Ethernet0/0

Configures the interface type and enters interface configuration mode.

•The optional name-tag argument specifies the logic name to identify the server configuration so that multiple server configurations can be entered.

Note This optional argument is for use with the Redundant Link Manager (RLM) feature.

Step 4

ip rsvp signalling dscp value
Example:

Router(config-if)# ip rsvp signalling dscp 6

Specifies the DSCP value to be used on all RSVP messages transmitted on an interface.

•Enter a number from 0 to 63.

Step 5

end
Example:

Router(config-if)# end

(Optional) Exits to privileged EXEC mode.

Verifying the Configuration

Perform the following task to verify that the Control Plane DSCP Support for RSVP feature has been configured.

SUMMARY STEPS

1. enable

2. show ip rsvp interface [interface-type interface-number] [detail]

3. exit

DETAILED STEPS

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

show ip rsvp interface [interface-type interface-number] [detail]
Example:

Router# show ip rsvp interface detail

Displays RSVP-related information.

•The optional interface-type specifies the type of the interface.

•The optional interface-number specifies the number of the interface.

•The optional detail keyword displays additional information about interfaces.

Step 3

exit
Example:

Router# exit

(Optional) Exits privileged EXEC mode.

Examples

This section provides the following example output:

Sample Output for the show ip rsvp interface detail Command

In the following sample output from the show ip rsvp interface detail command, only the serial interface 2/0 has DSCP configured. Interfaces that are not configured for DSCP do not show the DSCP value, which is 0 by default.
Router# show ip rsvp interface detail
Et1/1:
   Bandwidth:
     Curr allocated:0M bits/sec
     Max. allowed (total):7500K bits/sec
     Max. allowed (per flow):7500K bits/sec
   Neighbors:
     Using IP enacp:1.  Using UDP encaps:0
 Et1/2:
   Bandwidth:
     Curr allocated:0M bits/sec
     Max. allowed (total):7500K bits/sec
     Max. allowed (per flow):7500K bits/sec
   Neighbors:
     Using IP enacp:0.  Using UDP encaps:0
Se2/0:
   Bandwidth:
     Curr allocated:10K bits/sec
     Max. allowed (total):1536K bits/sec
     Max. allowed (per flow):1536K bits/sec
   Neighbors:
     Using IP enacp:1.  Using UDP encaps:0
   DSCP value used in Path/Resv msgs:0x6
   Burst Police Factor:300%
   RSVP:Data Packet Classification provided by: none
Configuration Examples for Control Plane DSCP Support for RSVP

This section provides the following configuration examples:

•Configuring a DSCP: Example

•Verifying Control Plane DSCP Support for RSVP: Example

Configuring a DSCP: Example

The following example configures a DSCP value on an interface:
Router# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# interface Serial2/0
Router(config-if)# ip rsvp signalling dscp 48
Verifying Control Plane DSCP Support for RSVP: Example

The following example verifies that the Control Plane DSCP Support for RSVP feature has been configured:
Router# show running-config interface Serial2/0
 interface Serial2/0
 ip address 10.1.1.1 255.255.255.0
 fair-queue 64 256 235
 ip rsvp signalling dscp 48
 ip rsvp bandwidth 7500 7500
Additional References

The following sections provide references related to the Control Plane DSCP Support for RSVP Scalability feature.

Related Documents

Related Topic

Document Title

QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples.

•Cisco IOS Quality of Service Solutions Command Reference, Release 12.4T

•Cisco IOS Quality of Service Solutions Command Reference, Release 12.2SR

QoS features including signaling, classification, and congestion management

Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.4T

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

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

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

RFC 2205

Resource Reservation Protocol

RFC 2206

RSVP Management Information Base Using SMIv

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register on Cisco.com.

http://www.cisco.com/techsupport

Command Reference

This section documents only commands that are modified.

•ip rsvp signalling dscp

•show ip rsvp interface

ip rsvp signalling dscp

To specify the differentiated services code point (DSCP) value to be used on all Resource Reservation Protocol (RSVP) messages transmitted on an interface, use the ip rsvp signalling dscp command in interface configuration mode. To disable this function, use the no form of this command.

ip rsvp signalling dscp value
no ip rsvp signalling dscp
Syntax Description

value

A number for the DSCP. Range is from 0 to 63. Default is 0.

Defaults

The default value is 0.

Command Modes

Interface configuration.

Command History

Release

Modification

12.1

This command was introduced

12.2(18)SXF2

This command was integrated into Cisco IOS Release 12.2(18)SXF2.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

You configure the DSCP per interface, not per flow. The DSCP determines the priority that a packet receives from various hops as it travels to its destination.

The DSCP applies to all RSVP flows installed on a specific interface. You can configure each interface independently for DSCP.

Examples

Here is an example of the ip rsvp signalling dscp command with a DSCP value of 6
Router(config-if)# ip rsvp signalling dscp 6
Router(config-if)# end
To verify the DSCP value, enter the show ip rsvp interface detail command:
Router# show ip rsvp interface serial2/0 detail
Se2/0:
   Bandwidth:
     Curr allocated:10K bits/sec
     Max. allowed (total):1536K bits/sec
     Max. allowed (per flow):1536K bits/sec
   Neighbors:
     Using IP enacp:1.  Using UDP encaps:0
   DSCP value used in Path/Resv msgs:0x6
   Burst Police Factor:300%
   RSVP:Data Packet Classification provided by: none
show ip rsvp interface

To display Resource Reservation Protocol (RSVP)-related information, use the show ip rsvp interface command in privileged EXEC mode.

show ip rsvp interface [interface-type interface-number] [detail]
Syntax Description

interface-type

(Optional) Type of the interface.

interface-number

(Optional) Number of the interface.

detail

(Optional) Additional information about interfaces.

Command Modes

Privileged EXEC

Command History

Release

Modification

11.2

This command was introduced.

12.2(2)T

The optional detail keyword was added.

12.2(4)T

This command was implemented on the Cisco 7500 series and the ATM-permanent virtual circuit (PVC) interface.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.2(13)T

The following modifications were made to this command:

•Rate-limiting and refresh-reduction information were added to the output display.

•This command was modified to display RSVP global settings when no keywords or arguments are entered.

12.2(15)T

The following modifications were made to this command:

•The command output was modified to display the effects of compression on admission control and the RSVP bandwidth limit counter.

•Cryptographic authentication parameters were added to the display.

12.2(18)SFX2

This command was integrated into Cisco IOS Release 12.2(18)SFX2.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Use the show ip rsvp interface command to display information about interfaces on which RSVP is enabled, including the current allocation budget and maximum available bandwidth. Enter the optional detail keyword for additional information, including bandwidth and signaling parameters and blockade state.

Use the show ip rsvp interface detail command to display information about the RSVP parameters associated with an interface. These parameters include the following:

•Total RSVP bandwidth

•RSVP bandwidth allocated to existing flows

•Maximum RSVP bandwidth that can be allocated to a single flow

•The type of admission control supported (header compression methods)

•The compression methods supported by RSVP compression prediction

Examples

The following command shows information for each interface on which RSVP is enabled:
Router# show ip rsvp interface
interface    allocated  i/f max  flow max sub max 
PO0/0        0          200M     200M     0   
PO1/0        0          50M      50M      0   
PO1/1        0          50M      50M      0   
PO1/2        0          50M      50M      0   
PO1/3        0          50M      50M      0   
Lo0          0          200M     200M     0   
Table 1 describes the fields shown in the display.

Table 1 show ip rsvp interface Field Descriptions

Field

Description

interface

Interface name.

allocated

Current allocation budget.

i/f max

Maximum allocatable bandwidth.

flow max

Largest single flow allocatable on this interface.

sub max

Largest sub-pool value allowed on this interface.

Detailed RSVP Information Example

The following command shows detailed RSVP information for each interface on which RSVP is enabled:
Router# show ip rsvp interface detail
PO0/0:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):200M bits/sec
     Max. allowed (per flow):200M bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
 PO1/0:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):50M bits/sec
     Max. allowed (per flow):50M bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
PO1/1:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):50M bits/sec
     Max. allowed (per flow):50M bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
 PO1/2:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):50M bits/sec
     Max. allowed (per flow):50M bits/secMax. allowed for LSP tunnels using sub-pools:0 
bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
 PO1/3:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):50M bits/sec
     Max. allowed (per flow):50M bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
 Lo0:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):200M bits/sec
     Max. allowed (per flow):200M bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Signalling:
     DSCP value used in RSVP msgs:0x3F
     Number of refresh intervals to enforce blockade state:4
     Number of missed refresh messages:4
     Refresh interval:30
Table 2 describes the significant fields shown in the detailed display for interface PO0/0. The fields for the other interfaces are similar.

Table 2 show ip rsvp interface detail Field Descriptions—Detailed RSVP Information Example

Field

Description

PO0/0

Interface name.

Bandwidth

The RSVP bandwidth parameters in effect including the following:

•Curr allocated = amount of bandwidth currently allocated in bits per second.

•Max. allowed (total) = maximum amount of bandwidth allowed in bits per second.

•Max. allowed (per flow) = maximum amount of bandwidth allowed per flow in bits per second.

•Max. allowed for LSP tunnels using sub-pools = maximum amount of bandwidth allowed for label switched path (LSP) tunnels in bits per second.

•Set aside by policy (total) = the amount of bandwidth set aside by the local policy in bits per second.

Signalling

The RSVP signalling parameters in effect including the following:

•DSCP value used in RSVP msgs = differentiated services code point (DSCP) used in RSVP messages.

•Number of refresh intervals to enforce blockade state = how long in milliseconds before the blockade takes effect.

•Number of missed refresh messages = how many refresh messages until the router state expires.

•Refresh interval = how long in milliseconds until a refresh message is sent.

RSVP Compression Method Prediction Example

The following example from the show ip rsvp interface detail command shows the RSVP compression method prediction configuration for each interface on which RSVP is configured:
Router# show ip rsvp interface detail
 Et2/1:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):1158K bits/sec
     Max. allowed (per flow):128K bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Admission Control:
     Header Compression methods supported:
       rtp (36 bytes-saved), udp (20 bytes-saved)
   Neighbors:
     Using IP encap:0.  Using UDP encap:0
   Signalling:
     Refresh reduction:disabled
   Authentication:disabled 
 Se3/0:
   Bandwidth:
     Curr allocated:0 bits/sec
     Max. allowed (total):1158K bits/sec
     Max. allowed (per flow):128K bits/sec
     Max. allowed for LSP tunnels using sub-pools:0 bits/sec
     Set aside by policy (total):0 bits/sec
   Admission Control:
     Header Compression methods supported:
       rtp (36 bytes-saved), udp (20 bytes-saved)
   Neighbors:
     Using IP encap:1.  Using UDP encap:0
   Signalling:
     Refresh reduction:disabled
   Authentication:disabled 
Table 3 describes the significant fields shown in the display for Ethernet interface 2/1. The fields for serial interface 3/0 are similar.

Table 3 show ip rsvp interface detail Field Descriptions—RSVP Compression Method Prediction Example

Field

Description

Et2/1: Se3/0

Interface name.

Bandwidth

The RSVP bandwidth parameters in effect including the following:

•Curr allocated = amount of bandwidth currently allocated in bits per second.

•Max. allowed (total) = maximum amount of bandwidth allowed in bits per second.

•Max. allowed (per flow) = maximum amount of bandwidth allowed per flow in bits per second.

•Max. allowed for LSP tunnels using sub-pools = maximum amount of bandwidth allowed for LSP tunnels in bits per second.

•Set aside by policy (total) = the amount of bandwidth set aside by the local policy in bits per second.

Admission Control

The type of admission control in effect including the following:

•Header Compression methods supported:

–Real-Time Transport Protocol (RTP) or User Data Protocol (UDP) compression schemes and the number of bytes saved per packet.

Neighbors

The number of neighbors using IP and UDP encapsulation.

Signalling

The type of signaling in effect; Refresh reduction is either enabled (active) or disabled (inactive).

Authentication

Authentication is either enabled (active) or disabled (inactive).

Cryptographic Authentication Example

The following example of the show ip rsvp interface detail command displays detailed information, including the cryptographic authentication parameters, for all RSVP-configured interfaces on the router:
Router# show ip rsvp interface detail
 Et0/0:
   Bandwidth:
    Curr allocated: 0 bits/sec
    Max. allowed (total): 7500K bits/sec
    Max. allowed (per flow): 7500K bits/sec
    Max. allowed for LSP tunnels using sub-pools: 0 bits/sec
    Set aside by policy (total):0 bits/sec
   Neighbors:
    Using IP encap: 0.  Using UDP encap: 0
   Signalling:
    Refresh reduction: disabled
   Authentication: enabled
    Key:           11223344
    Type:          sha-1
    Window size:   2
    Challenge:     enabled
Table 4 describes the significant fields shown in the display.

Table 4 show ip rsvp interface detail Field Descriptions—Cryptographic
Authentication Example

Field

Description

Et0/0

Interface name.

Bandwidth

The RSVP bandwidth parameters in effect including the following:

•Curr allocated = amount of bandwidth currently allocated in bits per second.

•Max. allowed (total) = maximum amount of bandwidth allowed in bits per second.

•Max. allowed (per flow) = maximum amount of bandwidth allowed per flow in bits per second.

•Max. allowed for LSP tunnels using sub-pools = maximum amount of bandwidth allowed for LSP tunnels in bits per second.

•Set aside by policy (total) = the amount of bandwidth set aside by the local policy in bits per second.

Neighbors

The number of neighbors using IP and UDP encapsulation.

Signalling

The type of signaling in effect; Refresh reduction is either enabled (active) or disabled (inactive).

Authentication

Authentication is either enabled (active) or disabled (inactive). The parameters include the following:

•Key = The key (string) for the RSVP authentication algorithm displayed in clear text (for example, 11223344) or encrypted <encrypted>.

•Type = The algorithm to generate cryptographic signatures in RSVP messages; possible values are md5 and sha-1.

•Window size = Maximum number of RSVP authenticated messages that can be received out of order.

•Challenge = The challenge-response handshake performed with any new RSVP neighbors that are discovered on a network; possible values are enabled (active) or disabled (inactive).

Related Commands

Command

Description

show ip rsvp installed

Displays RSVP-related installed filters and corresponding bandwidth information.

show ip rsvp neighbor

Displays current RSVP neighbors.

Glossary

admission control—The process in which an RSVP reservation is accepted or rejected based on end-to-end available network resources.

aggregate—A collection of packets with the same DSCP.

bandwidth—The difference between the highest and lowest frequencies available for network signals. This term also describes the rated throughput capacity of a given network medium or protocol.

CBWFQ—class-based weighted fair queueing. A queueing mechanism that extends the standard WFQ functionality to provide support for user-defined traffic classes.

DiffServ—An architecture based on a simple model where traffic entering a network is classified and possibly conditioned at the boundaries of the network. The class of traffic is then identified with a DS code point or bit marking in the IP header. Within the core of the network, packets are forwarded according to the per-hop behavior associated with the DS code point.

DSCP—differentiated services code point. The six most significant bits of the 1-byte IP type of service (ToS) field. The per-hop behavior represented by a particular DSCP value is configurable. DSCP values range between 0 and 63.

enterprise network—A large and diverse network connecting most major points in a company or other organization.

flow—A stream of data traveling between two endpoints across a network (for example, from one LAN station to another). Multiple flows can be transmitted on a single circuit.

packet—A logical grouping of information that includes a header containing control information and (usually) user data. Packets most often refer to network layer units of data.

PBX—private branch exchange. A digital or analog telephone switchboard located on the subscriber premises and used to connect private and public telephone networks.

PHB—per-hop behavior. A DiffServ concept that specifies how specifically marked packets are to be treated by each DiffServ router.

QoS—quality of service. A measure of performance for a transmission system that reflects its transmission quality and service availability.

RSVP—Resource Reservation Protocol. A protocol for reserving network resources to provide quality of service guarantees to application flows.

VoIP—Voice over IP. The ability to carry normal telephony-style voice over an IP-based internet maintaining telephone-like functionality, reliability, and voice quality.

WFQ—weighted fair queueing. A queue management algorithm that provides a certain fraction of link bandwidth to each of several queues, based on relative bandwidth applied to each of the queues.

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

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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

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Cisco IOS Software Releases 12.2 T

Control Plane DSCP Support for RSVP

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Table Of Contents

Control Plane DSCP Support for RSVP

Contents

Prerequisites for Control Plane DSCP Support for RSVP

Restrictions for Control Plane DSCP Support for RSVP

Information About Control Plane DSCP Support for RSVP

Feature Overview of Control Plane DSCP Support for RSVP

Benefits of Control Plane DSCP Support for RSVP

How to Configure Control Plane DSCP Support for RSVP

Enabling RSVP on an Interface

SUMMARY STEPS

DETAILED STEPS

Specifying the DSCP

SUMMARY STEPS

DETAILED STEPS

Verifying the Configuration

SUMMARY STEPS

DETAILED STEPS

Examples

Configuration Examples for Control Plane DSCP Support for RSVP

Configuring a DSCP: Example

Verifying Control Plane DSCP Support for RSVP: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

ip rsvp signalling dscp

Syntax Description

Defaults

Command Modes

Command History

Usage Guidelines

Examples

show ip rsvp interface

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples

Related Commands

Glossary