QoS: RSVP Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
RSVP Message Authentication
Downloads: This chapterpdf (PDF - 430.0KB) The complete bookPDF (PDF - 1.37MB) | Feedback

RSVP Message Authentication

RSVP Message Authentication

Last Updated: December 10, 2012

The Resource Reservation Protocol (RSVP) Message Authentication feature provides a secure method to control quality of service (QoS) access to a network.

History for the RSVP Message Authentication Feature

Release

Modification

12.2(15)T

This feature was introduced.

12.0(26)S

Restrictions were added for interfaces that use Fast Reroute (FRR) node or link protection and for RSVP hellos for FRR for packet over SONET (POS) interfaces.

12.0(29)S

Support was added for per-neighbor keys.

12.2(33)SRA

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

12.2(33)SXH

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

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 Message Authentication

Ensure that RSVP is configured on one or more interfaces on at least two neighboring devices that share a link within the network.

Restrictions for RSVP Message Authentication

  • The RSVP Message Authentication feature is only for authenticating RSVP neighbors.
  • The RSVP Message Authentication feature cannot discriminate between various QoS applications or users, of which many may exist on an authenticated RSVP neighbor.
  • Different send and accept lifetimes for the same key in a specific key chain are not supported; all RSVP key types are bidirectional.
  • Authentication for graceful restart hello messages is supported for per-neighbor and per-access control list (ACL) keys, but not for per-interface keys.
  • You cannot use the ip rsvp authentication key and the ip rsvp authentication key-chain commands on the same device interface.
  • For a Multiprotocol Label Switching/Traffic Engineering (MPLS/TE) configuration, use per-neighbor keys with physical addresses and device IDs.

Information About RSVP Message Authentication

Feature Design of RSVP Message Authentication

Network administrators need the ability to establish a security domain to control the set of systems that initiate RSVP requests.

The RSVP Message Authentication feature permits neighbors in an RSVP network to use a secure hash to sign all RSVP signaling messages digitally, thus allowing the receiver of an RSVP message to verify the sender of the message without relying solely on the sender's IP address as is done by issuing the ip rsvp neighbor command with an ACL.

The signature is accomplished on a per-RSVP-hop basis with an RSVP integrity object in the RSVP message as defined in RFC 2747. This method provides protection against forgery or message modification. However, the receiver must know the security key used by the sender in order to validate the digital signature in the received RSVP message.

Network administrators manually configure a common key for each RSVP neighbor interface on the shared network. A sample configuration is shown in the figure below.

Figure 1


RSVP Message Authentication Configuration

Global Authentication and Parameter Inheritance

You can configure global defaults for all authentication parameters including key, type, window size, lifetime, and challenge. These defaults are inherited when you enable authentication for each neighbor or interface. However, you can also configure these parameters individually on a per-neighbor or per-interface basis in which case the inherited global defaults are ignored.

Using global authentication and parameter inheritance can simplify configuration because you can enable or disable authentication without having to change each per-neighbor or per-interface attribute. You can activate authentication for all neighbors by using two commands, one to define a global default key and one to enable authentication globally. However, using the same key for all neighbors does not provide the best network security.


Note


RSVP uses the following rules when choosing which authentication parameter to use when that parameter is configured at multiple levels (per-interface, per-neighbor, or global). RSVP goes from the most specific to the least specific; that is, per-neighbor, per-interface, and then global. The rules are slightly different when searching the configuration for the right key to authenticate an RSVP message-- per-neighbor, per-ACL, per-interface, and then global.

Per-Neighbor Keys

In the figure below, to enable authentication between Internet service provider (ISP) Routers A and B, A and C, and A and D, the ISPs must share a common key. However, sharing a common key also enables authentication between ISP Routers B and C, C and D, and B and D. You may not want authentication among all the ISPs because they might be different companies with unique security domains.

Figure 2 RSVP Message Authentication in an Ethernet Configuration


On ISP Router A, you create a different key for ISP Routers B, C, and D and assign them to their respective IP addresses using RSVP commands. On the other devices, create a key to communicate with ISP Router A's IP address.

Key Chains

For each RSVP neighbor, you can configure a list of keys with specific IDs that are unique and have different lifetimes so that keys can be changed at predetermined intervals automatically without any disruption of service. Automatic key rotation enhances network security by minimizing the problems that could result if an untrusted source obtained, deduced, or guessed the current key.


Note


If you use overlapping time windows for your key lifetimes, RSVP asks the Cisco software key manager component for the next live key starting at time T. The key manager walks the keys in the chain until it finds the first one with start time S and end time E such that S <= T <= E. Therefore, the key with the smallest value (E-T) may not be used next.

Benefits of RSVP Message Authentication

Improved Security

The RSVP Message Authentication feature greatly reduces the chance of an RSVP-based spoofing attack and provides a secure method to control QoS access to a network.

Multiple Environments

The RSVP Message Authentication feature can be used in traffic engineering (TE) and non-TE environments as well as with the subnetwork bandwidth manager (SBM).

Multiple Platforms and Interfaces

The RSVP Message Authentication feature can be used on any supported RSVP platform or interface.

How to Configure RSVP Message Authentication

The following configuration parameters instruct RSVP on how to generate and verify integrity objects in various RSVP messages.


Note


There are two configuration procedures: full and minimal. There are also two types of authentication procedures: interface and neighbor.

Per-Interface Authentication--Full Configuration

Perform the following procedures for a full configuration for per-interface authentication:

Per-Interface Authentication--Minimal Configuration

Perform the following tasks for a minimal configuration for per-interface authentication:

Per-Neighbor Authentication--Full Configuration

Perform the following procedures for a full configuration for per-neighbor authentication:

Per-Neighbor Authentication--Minimal Configuration

Perform the following tasks for a minimal configuration for per-neighbor authentication:

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

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

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
 
Step 4
ip rsvp bandwidth [interface-kbps [single-flow-kbps]]

Example:

Device(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:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Configuring an RSVP Authentication Type

Perform this task to configure an RSVP authentication type.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.   Do one of the following:

  • ip rsvp authentication type {md5 | sha-1

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
Note    Omit this step if you are configuring an authentication type for a neighbor or setting a global default.
 
Step 4
Do one of the following:
  • ip rsvp authentication type {md5 | sha-1


Example:

For interface authentication:



Example:

Device(config-if)# ip rsvp authentication type sha-1



Example:



Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1 type sha-1



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1 type sha-1



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication type sha-1

 

Specifies the algorithm used to generate cryptographic signatures in RSVP messages on an interface or globally.

  • The algorithms are md5, the default, and sha-1, which is newer and more secure than md5.
Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 5
end


Example:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Configuring an RSVP Authentication Key

Perform this task to configure an RSVP authentication key.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.    ip rsvp authentication key passphrase

5.    exit

6.   Do one of the following:

  • ip rsvp authentication key-chain chain

7.    end


DETAILED STEPS
  Command or Action Purpose
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.

Note    If you want to configure a key, proceed to Step 3; if you want to configure a key chain, proceed to Step 6.
 
Step 3
interface type number


Example:

Device(config)# interface Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
Note    Omit this step and go to Step 6 if you want to configure only a key chain.
 
Step 4
ip rsvp authentication key passphrase


Example:

Device(config-if)# ip rsvp authentication key 11223344



Example:

 

Specifies the data string (key) for the authentication algorithm.

  • The key consists of 8 to 40 characters. It can include spaces and multiple words. It can also be encrypted or appear in clear text when displayed.
Note    Omit this step if you want to configure a key chain.
 
Step 5
exit


Example:

Device(config-if)# exit

 

Exits to global configuration mode.

 
Step 6
Do one of the following:
  • ip rsvp authentication key-chain chain


Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1 key-chain xzy



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1 key-chain xzy



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication key-chain xzy

 

Specifies the data string (key chain) for the authentication algorithm.

  • The key chain must have at least one key, but can have up to 2,147,483647 keys.
Note    You cannot use the ip rsvp authentication key and the ip rsvp authentication key-chain commands on the same device interface. The commands supersede each other; however, no error message is generated.
Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 7
end


Example:

Device(config)# end

 

Returns to privileged EXEC mode.

 

Enabling RSVP Key Encryption

Perform this task to enable RSVP key encryption when the key is stored in the configuration. (This prevents anyone from seeing the clear text key in the configuration file.)

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    key config-key 1 string

4.    end


DETAILED STEPS
  Command or Action Purpose
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
key config-key 1 string


Example:

Device(config)# key config-key 1 11223344

 

Enables key encryption in the configuration file.

Note    The string argument can contain up to eight alphanumeric characters.
 
Step 4
end


Example:

Device(config)# end

 

Returns to privileged EXEC mode.

 

Enabling RSVP Authentication Challenge

Perform this task to enable RSVP authentication challenge.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.   Do one of the following:

  • ip rsvp authentication challenge

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
Note    Omit this step if you are configuring an authentication challenge for a neighbor or setting a global default.
 
Step 4
Do one of the following:
  • ip rsvp authentication challenge


Example:

For interface authentication:



Example:

Device(config-if)# ip rsvp authentication challenge



Example:



Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1 challenge



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1 challenge



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication challenge

 

Makes RSVP perform a challenge-response handshake on an interface or globally when RSVP learns about any new challenge-capable neighbors on a network.

Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 5
end


Example:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Configuring RSVP Authentication Lifetime

Perform this task to configure the lifetimes of security associations between RSVP neighbors.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.   Do one of the following:

  • ip rsvp authentication lifetime hh : mm : ss

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

Note    Omit this step if you are configuring an authentication lifetime for a neighbor or setting a global default.
  • The type numberargument identifies the interface to be configured.
 
Step 4
Do one of the following:
  • ip rsvp authentication lifetime hh : mm : ss


Example:

For interface authentication:



Example:

Device(config-if)# ip rsvp authentication lifetime 00:05:00



Example:



Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1 lifetime 00:05:00



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1 lifetime 00:05:00



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication 00:05:00

 

Controls how long RSVP maintains security associations with RSVP neighbors on an interface or globally.

  • The default security association for hh:mm:ss is 30 minutes; the range is 1 second to 24 hours.
Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 5
end


Example:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Configuring RSVP Authentication Window Size

Perform this task to configure the RSVP authentication window size.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.   Do one of the following:

  • ip rsvp authentication window-size n

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
Note    Omit this step if you are configuring a window size for a neighbor or setting a global default.
 
Step 4
Do one of the following:
  • ip rsvp authentication window-size n


Example:

For interface authentication:



Example:

Device(config-if)# ip rsvp authentication window-size 2



Example:



Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1 window-size 2



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1 window-size



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication window-size 2

 

Specifies the maximum number of authenticated messages that can be received out of order on an interface or globally.

  • The default value is one message; the range is 1 to 64 messages.
Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 5
end


Example:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Activating RSVP Authentication

Perform this task to activate RSVP authentication.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.   Do one of the following:

  • ip rsvp authentication

5.    end


DETAILED STEPS
  Command or Action Purpose
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 Ethernet0/0

 

Enters interface configuration mode.

  • The type numberargument identifies the interface to be configured.
Note    Omit this step if you are configuring authentication for a neighbor or setting a global default.
 
Step 4
Do one of the following:
  • ip rsvp authentication


Example:

For interface authentication:



Example:

Device(config-if)# ip rsvp authentication



Example:



Example:

For neighbor authentication:



Example:

Device(config)# ip rsvp authentication neighbor address 10.1.1.1



Example:



Example:

Device(config)# ip rsvp authentication neighbor access-list 1



Example:



Example:

For a global default:



Example:

Device(config)# ip rsvp authentication

 

Activates RSVP cryptographic authentication on an interface or globally.

Note    Omit the neighbor address addressor the neighbor access-list acl-nameor acl-numberto set the global default.
 
Step 5
end


Example:

Device(config-if)# end

 

Returns to privileged EXEC mode.

 

Verifying RSVP Message Authentication

Perform this task to verify that the RSVP Message Authentication feature is functioning.

SUMMARY STEPS

1.    enable

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

3.    show ip rsvp authentication [detail] [from{ip-address | hostname}] [to {ip-address | hostname}]

4.    show ip rsvp counters [authentication | interface interface-unit | neighbor | summary]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show ip rsvp interface [detail] [interface-type interface-number]


Example:

Device# show ip rsvp interface detail

 

Displays information about interfaces on which RSVP is enabled, including the current allocation budget and maximum available bandwidth.

  • The optional detail keyword displays the bandwidth, signaling, and authentication parameters.
 
Step 3
show ip rsvp authentication [detail] [from{ip-address | hostname}] [to {ip-address | hostname}]


Example:

Device# show ip rsvp authentication detail

 

Displays the security associations that RSVP has established with other RSVP neighbors.

  • The optional detail keyword displays state information that includes IP addresses, interfaces enabled, and configured cryptographic authentication parameters about security associations that RSVP has established with neighbors.
 
Step 4
show ip rsvp counters [authentication | interface interface-unit | neighbor | summary]


Example:

Device# show ip rsvp counters summary



Example:



Example:

Device# show ip rsvp counters authentication

 

Displays all RSVP counters.

Note    The errors counter increments whenever an authentication error occurs, but can also increment for errors not related to authentication.
  • The optional authentication keyword shows a list of RSVP authentication counters.
  • The optional interface interface-unit keyword argument combination shows the number of RSVP messages sent and received by the specific interface.
  • The optional neighborkeyword shows the number of RSVP messages sent and received by the specific neighbor.
  • The optional summarykeyword shows the cumulative number of RSVP messages sent and received by the device. It does not print per-interface counters.
 

Configuring a Key Chain

Perform this task to configure a key chain for neighbor authentication.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    key chain name-of-chain

4.    {key [key-ID] | key-string [text] | accept-lifetime [start-time {infinite | end-time | duration seconds}] | send-lifetime [start-time {infinite | end-time | duration seconds}]

5.    end


DETAILED STEPS
  Command or Action Purpose
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
key chain name-of-chain


Example:

Device(config)# key chain neighbor_V

 

Enters key-chain mode.

 
Step 4
{key [key-ID] | key-string [text] | accept-lifetime [start-time {infinite | end-time | duration seconds}] | send-lifetime [start-time {infinite | end-time | duration seconds}]

Example:

Device(config-keychain)# key 1



Example:



Example:

Device(config-keychain)# key-string ABcXyz

 

Selects the parameters for the key chain. (These are submodes.)

Note    For details on these parameters, see the Cisco IOS IP Command Reference, Volume 2 of 4, Routing Protocols, Release 12.3T.
Note    accept-lifetime is ignored when a key chain is assigned to RSVP.
 
Step 5
end


Example:

Device(config-keychain)# end

 

Returns to privileged EXEC mode.

 

Binding a Key Chain to an RSVP Neighbor

Perform this task to bind a key chain to an RSVP neighbor for neighbor authentication.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.   Do one of the following:

  • ip rsvp authentication neighbor address address key-chain key-chain-name
  • ip rsvp authentication neighbor access-list acl-name or acl-number key-chain key-chain-name

4.    end


DETAILED STEPS
  Command or Action Purpose
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
Do one of the following:
  • ip rsvp authentication neighbor address address key-chain key-chain-name
  • ip rsvp authentication neighbor access-list acl-name or acl-number key-chain key-chain-name


Example:

Device(config)# ip rsvp authentication neighbor access-list 1 key-chain neighbor_V

 

Binds a key chain to an IP address or to an ACL and enters key-chain mode.

Note    If you are using an ACL, you must create it before you bind it to a key chain. See the ip rsvp authentication command in the Glossary section for examples.
 
Step 4
end


Example:

Device(config-keychain)# end

 

Returns to privileged EXEC mode.

 

Troubleshooting Tips

After you enable RSVP authentication, RSVP logs system error events whenever an authentication check fails. These events are logged instead of just being displayed when debugging is enabled because they may indicate potential security attacks. The events are generated when:

  • RSVP receives a message that does not contain the correct cryptographic signature. This could be due to misconfiguration of the authentication key or algorithm on one or more RSVP neighbors, but it may also indicate an (unsuccessful) attack.
  • RSVP receives a message with the correct cryptographic signature, but with a duplicate authentication sequence number. This may indicate an (unsuccessful) message replay attack.
  • RSVP receives a message with the correct cryptographic signature, but with an authentication sequence number that is outside the receive window. This could be due to a reordered burst of valid RSVP messages, but it may also indicate an (unsuccessful) message replay attack.
  • Failed challenges result from timeouts or bad challenge responses.

To troubleshoot the RSVP Message Authentication feature, use the following commands in privileged EXEC mode.

Command

Purpose

Device# debug ip rsvp authentication

Displays output related to RSVP authentication.

Device# debug ip rsvp dump signalling

Displays brief information about signaling (Path and Resv) messages.

Device# debug ip rsvp errors

Displays error events including authentication errors.

Configuration Examples for RSVP Message Authentication

Example RSVP Message Authentication Per-Interface

In the following example, the cryptographic authentication parameters, including type, key, challenge, lifetime, and window size are configured; and authentication is activated:

Device# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Device(config)# interface e0/0
Device(config-if)# ip rsvp bandwidth 7500 7500
Device(config-if)# ip rsvp authentication type sha-1
Device(config-if)# ip rsvp authentication key 11223344
Device(config-if)# ip rsvp authentication challenge
Device(config-if)# ip rsvp authentication lifetime 00:30:05
Device(config-if)# ip rsvp authentication window-size 2
Device(config-if)# ip rsvp authentication

In the following output from the show ip rsvp interface detail command, notice the cryptographic authentication parameters that you configured for the Ethernet0/0 interface:

Device# 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 

In the preceding example, the authentication key appears in clear text. If you enter the key-config-key 1 string command, the key appears encrypted, as in the following example:

Device# 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:         <encrypted>
     Type:        sha-1
     Window size: 2
     Challenge:   enabled

In the following output, notice that the authentication key changes from encrypted to clear text after the no key config-key 1 command is issued:

Device# show running-config interface e0/0
Building configuration...
Current configuration :247 bytes
!
interface Ethernet0/0
 ip address 192.168.101.2 255.255.255.0
 no ip directed-broadcast
 ip pim dense-mode
 no ip mroute-cache
 no cdp enable
 ip rsvp bandwidth 7500 7500
 ip rsvp authentication key 7>70>9:7<872>?74
 ip rsvp authentication
end
Device# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Device(config)# no key config-key 1
 
Device(config)# end

Device# show running-config
*Jan 30  08:02:09.559:%SYS-5-CONFIG_I:Configured from console by console
int e0/0
Building configuration...
Current configuration :239 bytes
!
interface Ethernet0/0
 ip address 192.168.101.2 255.255.255.0
 no ip directed-broadcast
 ip pim dense-mode
 no ip mroute-cache
 no cdp enable
 ip rsvp bandwidth 7500 7500
 ip rsvp authentication key 11223344
 ip rsvp authentication
end

Example RSVP Message Authentication Per-Neighbor

In the following example, a key chain with two keys for each neighbor is defined, then an access list and a key chain are created for neighbors V, Y, and Z and authentication is explicitly enabled for each neighbor and globally. However, only the neighbors specified will have their messages accepted; messages from other sources will be rejected. This enhances network security.

For security reasons, you should change keys on a regular basis. When the first key expires, the second key automatically takes over. At that point, you should change the first key's key-string to a new value and then set the send lifetimes to take over after the second key expires. The device will log an event when a key expires to remind you to update it.

The lifetimes of the first and second keys for each neighbor overlap. This allows for any clock synchronization problems that might cause the neighbors not to switch keys at the right time. You can avoid these overlaps by configuring the neighbors to use Network Time Protocol (NTP) to synchronize their clocks to a time server.

For an MPLS/TE configuration, physical addresses and device IDs are given.

Device# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Device(config)# key chain neighbor_V
Device(config-keychain)# key 1
Device(config-keychain-key)# key-string R72*UiAXy
Device(config-keychain-key)# send-life 02:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# key 2
Device(config-keychain-key)# key-string Pl349&DaQ
Device(config-keychain-key)# send-life 01:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# exit
Device(config)# key chain neighbor_Y
Device(config-keychain)# key 3
Device(config-keychain-key)# key-string *ZXFwR!03
Device(config-keychain-key)# send-life 02:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# key 4
Device(config-keychain-key)# key-string UnGR8f&lOmY
Device(config-keychain-key)# send-life 01:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# exit
Device(config)# key chain neighbor_Z
Device(config-keychain)# key 5
Device(config-keychain-key)# key-string P+T=77&/M
Device(config-keychain-key)# send-life 02:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# key 6
Device(config-keychain-key)# key-string payattention2me
Device(config-keychain-key)# send-life 01:00:00 1 jun 2003 02:00:00 1 aug 2003
Device(config-keychain-key)# exit
Device(config-keychain)# exit
Device(config)# end

Note


You can use the key-config-key 1 string command to encrypt key chains for an interface, a neighbor, or globally.
Device# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Device(config)# ip access-list standard neighbor_V
Device(config-std-nacl)# permit 10.0.0.1 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.2 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.3 
<------- router ID
Device(config-std-nacl)# exit
Device(config)# ip access-list standard neighbor_Y
Device(config-std-nacl)# permit 10.0.0.4 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.5 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.6 
<------- router ID
Device(config-std-nacl)# exit
Device(config)# ip access-list standard neighbor_Z
Device(config-std-nacl)# permit 10.0.0.7 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.8 
<------- physical address
Device(config-std-nacl)# permit 10.0.0.9 
<------- router ID
Device(config-std-nacl)# exit
Device(config)# ip rsvp authentication neighbor access-list neighbor_V key-chain neighbor_V
Device(config)# ip rsvp authentication neighbor access-list neighbor_Y key-chain neighbor_Y
Device(config)# ip rsvp authentication neighbor access-list neighbor_Z key-chain neighbor_Z
Device(config)# ip rsvp authentication
Device(config)# end

Additional References

The following sections provide references related to the RSVP Message Authentication feature.

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

RSVP commands: complete command syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS Quality of Service Solutions Command Reference

QoS features including signaling, classification, and congestion management

"Quality of Service Overview" module

Inter-AS features including local policy support and per-neighbor keys authentication

"MPLS Traffic Engineering--Inter-AS-TE" module

Standards

Standards

Title

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

--

MIBs

MIBs

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

RFCs

Title

RFC 1321

The MD5 Message Digest Algorithm

RFC 2104

HMAC: Keyed-Hashing for Messaging Authentication

RFC 2205

Resource Reservation Protocol

RFC 2209

RSVP--Version 1 Message Processing Rules

RFC 2401

Security Architecture for the Internet Protocol

RFC 2747

RSVP Cryptographic Authentication

RFC 3097

RSVP Crytographic Authentication--Updated Message Type Value

RFC 3174

US Secure Hash Algorithm 1 (SHA1)

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 Message Authentication

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 Message Authentication
Feature Name Releases Feature Information

RSVP Message Authentication

Cisco IOS XE Release 3.8S

In Cisco IOS XE Release 3.8S, support was added for the Cisco ASR 903 Router.

Glossary

bandwidth --The difference between the highest and lowest frequencies available for network signals. The term also is used to describe the rated throughput capacity of a given network medium or protocol.

DMZ--demilitarized zone. The neutral zone between public and corporate networks.

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.

key --A data string that is combined with source data according to an algorithm to produce output that is unreadable until decrypted.

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

router --A network layer device that uses one or more metrics to determine the optimal path along which network traffic should be forwarded. Routers forward packets from one network to another based on network layer information.

RSVP --Resource Reservation Protocol. A protocol that supports the reservation of resources across an IP network. Applications running on IP end systems can use RSVP to indicate to other nodes the nature (bandwidth, jitter, maximum burst, and so on) of the packet streams they want to receive.

security association --A block of memory used to hold all the information RSVP needs to authenticate RSVP signaling messages from a specific RSVP neighbor.

spoofing --The act of a packet illegally claiming to be from an address from which it was not actually sent. Spoofing is designed to foil network security mechanisms, such as filters and access lists.

TE --traffic engineering. The techniques and processes used to cause routed traffic to travel through the network on a path other than the one that would have been chosen if standard routing methods had been used.

trusted neighbor --A device with authorized access to information.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

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

© 2012 Cisco Systems, Inc. All rights reserved.