MPLS Traffic Engineering - AutoTunnel Mesh Groups
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MPLS Traffic Engineering—AutoTunnel Mesh Groups

Table Of Contents

MPLS Traffic Engineering—AutoTunnel Mesh Groups

Finding Feature Information

Contents

Prerequisites for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Restrictions for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Information About MPLS Traffic Engineering—AutoTunnel Mesh Groups

AutoTunnel Mesh Groups Description and Benefits

Access Lists for Mesh Tunnel Interfaces

AutoTunnel Template Interfaces

OSPF Flooding of Mesh Group Information

How to Configure MPLS Traffic Engineering—AutoTunnel Mesh Groups

Configuring a Mesh of TE Tunnel LSPs

Enabling Autotunnel Mesh Groups Globally

Creating an Access List Using a Name

Creating an Autotunnel Template Interface

Specifying the Range of Mesh Tunnel Interface Numbers

Displaying Configuration Information About Tunnels

Monitoring the Autotunnel Mesh Network

Troubleshooting Tips

Configuring IGP Flooding for Autotunnel Mesh Groups

Configuration Examples for MPLS Traffic Engineering—Autotunnel Mesh Groups

Configuring a Mesh of TE Tunnel LSPs: Examples

Enabling Autotunnel Mesh Groups Globally: Example

Creating an Access List Using a Name: Example

Creating an AutoTunnel Template Interface: Example

Specifying the Range of Mesh Tunnel Interface Numbers: Example

Configuring IGP Flooding for Autotunnel Mesh Groups: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Glossary


MPLS Traffic Engineering—AutoTunnel Mesh Groups


First Published: January 27, 2004
Last Updated: October 21, 2009

The MPLS Traffic Engineering—AutoTunnel Mesh Groups feature allows a network administrator to configure traffic engineering (TE) label switched paths (LSPs) by using a few command-line interface (CLI) commands.

In a network topology where edge TE label switch routers (LSRs) are connected by core LSRs, the MPLS Traffic Engineering—AutoTunnel Mesh Groups feature automatically constructs a mesh of TE LSPs among the provider edge (PE) routers.

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 for MPLS Traffic Engineering—AutoTunnel Mesh Groups" section.

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 MPLS Traffic Engineering—AutoTunnel Mesh Groups

Restrictions for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Information About MPLS Traffic Engineering—AutoTunnel Mesh Groups

How to Configure MPLS Traffic Engineering—AutoTunnel Mesh Groups

Configuration Examples for MPLS Traffic Engineering—Autotunnel Mesh Groups

Additional References

Feature Information for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Glossary

Prerequisites for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Be knowledgeable about MPLS TE. See the "Additional References" section.

Decide how you will set up autotunnels (that is, identify the tunnel commands that you will include in the template interface).

Identify a block of addresses that you will reserve for mesh tunnel interfaces.

Restrictions for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Mesh groups do not support interarea tunnels because the destinations of those tunnels do not exist in the local area TE database.

You cannot configure a static route to route traffic over autotunnel mesh group TE tunnels. You should use only the autoroute for tunnel selection.

Intermediate System-to-System (IS-IS) does not support Interior Gateway Protocol (IGP) distribution of mesh group information. For IS-IS, only Access Control Lists (ACLs) can be used.

Information About MPLS Traffic Engineering—AutoTunnel Mesh Groups

To configure autotunnel mesh groups, you need to understand the following concepts:

AutoTunnel Mesh Groups Description and Benefits

Access Lists for Mesh Tunnel Interfaces

AutoTunnel Template Interfaces

OSPF Flooding of Mesh Group Information

AutoTunnel Mesh Groups Description and Benefits

An autotunnel mesh group (referred to as a mesh group) is a set of connections between edge LSRs in a network. There are two types of mesh groups:

Full—All the edge LSRs are connected. Each PE router has a tunnel to each of the other PE routers.

Partial—Some of the edge LSRs are not connected to each other by tunnels.

In a network topology where edge TE LSRs are connected by core LSRs, the MPLS Traffic Engineering—AutoTunnel Mesh Groups feature automatically constructs a mesh of TE LSPs among the PE routers.

Initially, you must configure each existing TE LSR to be a member of the mesh by using a minimal set of configuration commands. When the network grows (that is, when one or more TE LSRs are added to the network as PE routers), you do not need to reconfigure the existing TE LSR members of that mesh.

Mesh groups have the following benefits:

Minimize the initial configuration of the network. You configure one template interface per mesh, and it propagates to all mesh tunnel interfaces, as needed.

Minimize future configurations resulting from network growth. The feature eliminates the need to reconfigure each existing TE LSR to establish a full mesh of TE LSPs whenever a new PE router is added to the network.

Enable existing routers to configure TE LSPs to new PE routers.

Enable the construction of a mesh of TE LSPs among the PE routers automatically.

Access Lists for Mesh Tunnel Interfaces

The access list determines the destination addresses for the mesh tunnel interfaces. It is useful if you preallocate a block of related IP addresses. You can use that block of addresses to control the PE routers to which a full or partial mesh of TE tunnel LSPs is established. The access list allows matches for only the addresses that are learned and stored in the TE topology database.

For example, you can create an access list that matches all 10.1.1.1 IP addresses. You configure a template with the access list, then the template creates mesh tunnel interfaces to destinations within the TE topology database that match destinations in that access list.

Whenever the TE topology database is updated (for example, when a new TE LSR is inserted into the Interior Gateway Protocol (IGP), the destination address is stored in the TE topology database of each router in the IGP. At each update, the Mesh Group feature compares the destination address contained in the database to IP addresses in the access list associated with all template interfaces. If there is a match, the Mesh Group feature establishes a mesh tunnel interface to the tunnel destination IP address.

AutoTunnel Template Interfaces

An autotunnel template interface is a logical entity; that is, it is a configuration for a tunnel interface that is not tied to specific tunnel interfaces. It can be applied dynamically, when needed.

Mesh tunnel interfaces are tunnel interfaces that are created, configured dynamically (for example, by the applying [or cloning] of a template interface), used, and then freed when they are no longer needed.

A mesh tunnel interface obtains its configuration information from a template, except for the tunnel's destination address, which it obtains from the TE topology database that matches an access list or from the IGP mesh group advertisement.

The template interface allows you to enter commands once per mesh group. These commands specify how mesh tunnel interfaces are created. Each time a new router is added to the network, a new mesh tunnel interface is created. The configuration of the interface is duplicated from the template. Each mesh tunnel interface has the same path constraints and other parameters configured on the template interface. Only the tunnel destination address is different.

OSPF Flooding of Mesh Group Information

For OSPF to advertise or flood mesh group information, you need to configure a mesh group in OSPF and add that mesh group to an autotemplate interface. When the configuration is complete, OSPF advertises the mesh group IDs to all LSRs. MPLS TE LSPs automatically connect the edge LSRs in each mesh group. For configuration information, see the "Configuring IGP Flooding for Autotunnel Mesh Groups" section.

OSPF can advertise mesh group IDs for an OSPF area. OSPF is the only IGP supported in the Cisco IOS 12.0(29)S, 12.2(33)SRA, 12.2(33)SXH, and 12.4(20)T releases of the MPLS Traffic Engineering—AutoTunnel Mesh Groups feature.

How to Configure MPLS Traffic Engineering—AutoTunnel Mesh Groups

This section contains the following procedures:

Configuring a Mesh of TE Tunnel LSPs (required)

Specifying the Range of Mesh Tunnel Interface Numbers (optional)

Displaying Configuration Information About Tunnels (optional)

Monitoring the Autotunnel Mesh Network (required)

Configuring IGP Flooding for Autotunnel Mesh Groups (optional)

Configuring a Mesh of TE Tunnel LSPs

Perform the following tasks on each PE router in your network to configure a mesh of TE tunnel LSPs:

Enabling Autotunnel Mesh Groups Globally

Creating an Access List Using a Name

Creating an Autotunnel Template Interface


Note You can perform these tasks in any order.


Enabling Autotunnel Mesh Groups Globally

Perform this task on all PE routers in your network that you want to be part of an autotunnel mesh group.

SUMMARY STEPS

1. enable

2. configure terminal

3. mpls traffic-eng auto-tunnel mesh

4. 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 

mpls traffic-eng auto-tunnel mesh

Example:

Router(config)# mpls traffic-eng auto-tunnel mesh

Enables autotunnel mesh groups globally.

Step 4 

end

Example:

Router(config)# end

Exits to privileged EXEC mode.


Creating an Access List Using a Name

The access list determines the destination addresses for the mesh tunnel interfaces. You can use an access list to control the PE routers to which a full or partial mesh of TE tunnel LSPs is established. The access list allows matches for only the addresses that are learned and stored in the TE topology database.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip access-list {standard | extended} access-list-name

4. permit source [source-wildcard]

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 

ip access-list {standard | extended} access-list-name

Example:

Router(config)# ip access-list standard a1

Defines an IP access list using a name and enters standard named access list configuration mode.

The standard keyword specifies a standard IP access list.

The extended keyword specifies an extended IP access list.

The access-list-name argument is the name of the access list. A name cannot contain a space or quotation mark and must begin with an alphabetic character. This prevents confusion with numbered access lists.

Step 4 

permit source [source-wildcard]

Example:

Router(config-std-nacl)# permit 10.0.0.0 0.255.255.255

Sets conditions to allow a packet to pass a named IP access list.

The source argument is the number of the network or host from which the packet is being sent. There are three alternative ways to specify the source:

Use a 32-bit quantity in four-part dotted decimal format.

Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.

Use host source as an abbreviation for a source and source-wildcard of source 0.0.0.0.

The source-wildcard argument is the wildcard bits to be applied to source. There are three alternative ways to specify the source wildcard:

Use a 32-bit quantity in four-part dotted decimal format. Place 1s in the bit positions you want to ignore.

Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.

Use host source as an abbreviation for a source and source-wildcard of source 0.0.0.0.

Step 5 

end

Example:

Router(config-std-nacl)# end

Exits to privileged EXEC mode.

Creating an Autotunnel Template Interface

Creating an autotunnel template interface helps minimize the initial configuration of the network. You configure one template interface per mesh, which propagates to all mesh tunnel interfaces, as needed.


Note You can use the following commands to create a minimal configuration.


SUMMARY STEPS

1. enable

2. configure terminal

3. interface auto-template interface-num

4. ip unnumbered interface-type interface-number

5. tunnel mode {aurp | cayman | dvmrp | eon | gre | ipip | iptalk | mpls | nos}

6. tunnel mpls traffic-eng autoroute announce

7. tunnel mpls traffic-eng priority setup-priority [hold-priority]

8. tunnel mpls traffic-eng auto-bw [collect-bw] [frequency seconds] [max-bw kbps] [min-bw kbps]

9. tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}} [lockdown]

10. tunnel destination access-list num

11. 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 auto-template interface-num

Example:

Router(config)# interface auto-template 1

Creates a template interface and enters interface configuration mode.

The interface-num argument is the interface number. Valid values are from 1 to 25.

Step 4 

ip unnumbered interface-type interface-number

Example:

Router(config-if)# ip unnumbered Loopback 0

Enables IP processing on an interface without assigning an explicit IP address to the interface.

The type and number arguments name the type and number of another interface on which the router has an assigned IP address. It cannot be another unnumbered interface.

Step 5 

tunnel mode {aurp | cayman | dvmrp | eon | gre | ipip | iptalk | mpls | nos}

Example:

Router(config-if)# tunnel mode mpls

Sets the encapsulation mode for the tunnel interface.

Step 6 

tunnel mpls traffic-eng autoroute announce

Example:

Router(config-if)# tunnel mpls traffic-eng autoroute announce

Specifies that the IGP should use the tunnel (if the tunnel is up) in its enhanced shortest path first algorithm (SPF) calculation.

Step 7 

tunnel mpls traffic-eng priority setup-priority [hold-priority]

Example:

Router(config-if)# tunnel mpls traffic-eng priority 1 1

Configures the setup and reservation priority for an MPLS TE tunnel.

The setup-priority argument is the priority used when an LSP is signaled for this tunnel and determines which existing tunnels can be preempted. Valid values are from 0 to 7, where a lower number indicates a higher priority. Therefore, an LSP with a setup priority of 0 can preempt any LSP with a non-0 priority.

The hold-priority argument is the priority associated with an LSP for this tunnel and determines if it should be preempted by other LSPs that are being signaled. Valid values are from 0 to 7, where a lower number indicates a higher priority.

Step 8 

tunnel mpls traffic-eng auto-bw [collect-bw] [frequency seconds] [max-bw kbps] [min-bw kbps]

Example:

Router(config-if)# tunnel mpls traffic-eng auto-bw

Configures a tunnel for automatic bandwidth adjustment and for control of the manner in which the bandwidth for a tunnel is adjusted.

The collect-bw keyword collects output rate information for the tunnel, but does not adjust the tunnel's bandwidth.

The frequency seconds keyword-argument pair is the interval between bandwidth adjustments. The specified interval can be from 300 to 604800 seconds. Do not specify a value lower than the output rate sampling interval specified in the mpls traffic-eng auto-bw command in global configuration mode.

The max-bw kbps keyword-argument pair is the maximum automatic bandwidth, in kbps, for this tunnel. The value can be from 0 to 4294967295.

The min-bw kbps keyword-argument pair is the minimum automatic bandwidth, in kbps, for this tunnel. The value can be from 0 to 4294967295.

Step 9 

tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}} [lockdown]

Example:

Router(config-if)# tunnel mpls traffic-eng path-option 1 dynamic

Configures a path option for an MPLS TE tunnel.

The number argument is the number of the path option. When multiple path options are configured, lower numbered options are preferred.

The dynamic keyword specifies that the path of the LSP is dynamically calculated.

The explicit keyword specifies that the path of the LSP is an IP explicit path.

The name path-name keyword-argument pair is the path name of the IP explicit path that the tunnel uses with this option.

The path-number argument is the path number of the IP explicit path that the tunnel uses with this option.

The lockdown keyword specifies that the LSP cannot be reoptimized.

Step 10 

tunnel destination access-list num

Example:

Router(config-if)# tunnel destination access-list 1

Specifies the access list that the template interface uses for obtaining the mesh tunnel interface destination address.

The num argument is the number of the access list.

Step 11 

end

Example:

Router(config)# end

Exits to privileged EXEC mode.

Specifying the Range of Mesh Tunnel Interface Numbers

SUMMARY STEPS

1. enable

2. configure terminal

3. mpls traffic-eng auto-tunnel mesh tunnel-num min num max num

4. 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 

mpls traffic-eng auto-tunnel mesh tunnel-num min num max num

Example:

Router(config)# mpls traffic-eng auto-tunnel mesh tunnel-num min 1000 max 2000

Specifies the range of mesh tunnel interface numbers.

The min num keyword-argument pair specifies the beginning number of the range of mesh tunnel interface numbers. Valid values are from 1 to 65535.

The max num keyword-argument pair specifies the ending number of the range of mesh tunnel interface numbers. Valid values are from 1 to 65535.

Step 4 

end

Example:

Router(config)# end

Exits to privileged EXEC mode.

Displaying Configuration Information About Tunnels

SUMMARY STEPS

1. enable

2. show running interface auto-template num

3. show interface tunnel num configuration

4. exit

DETAILED STEPS


Step 1 enable

Use this command to enable privileged EXEC mode. Enter your password if prompted. For example:

Router> enable
Router#
 
   

Step 2 show running interface auto-template num

Use this command to display interface configuration information for a tunnel interface. For example:

Router# show running interface auto-template 1 
 
   
interface auto-template1 
 ip unnumbered Loopback0 
 no ip directed-broadcast 
 no keepalive 
 tunnel destination access-list 1 
 tunnel mode mpls traffic-eng 
 tunnel mpls traffic-eng autoroute announce 
 tunnel mpls traffic-eng path-option 1 dynamic
 
   

This output shows that autotunnel template interface auto-template1 uses an access list (access-list 1) to determine the destination addresses for the mesh tunnel interfaces.

Step 3 show interface tunnel num configuration

Use this command to display the configuration of the mesh tunnel interface. For example:

Router# show interface tunnel 5 configuration 
 
   
interface tunnel 5
 ip unnumbered Loopback0 
 no ip directed-broadcast 
 no keepalive 
 tunnel destination access-list 1 
 tunnel mode mpls traffic-eng 
 tunnel mpls traffic-eng autoroute announce 
 tunnel mpls traffic-eng path-option 1 dynamic
 
   

Step 4 exit

Use this command to exit to user EXEC mode. For example:

Router# exit
Router>
 
   

Monitoring the Autotunnel Mesh Network

SUMMARY STEPS

1. enable

2. show mpls traffic-eng tunnels property auto-tunnel mesh [brief]

3. show mpls traffic-eng auto-tunnel mesh

4. exit

DETAILED STEPS


Step 1 enable

Use this command to enable privileged EXEC mode. Enter your password if prompted. For example:

Router> enable
Router#
 
   

Step 2 show mpls traffic-eng tunnels property auto-tunnel mesh [brief]

Use this command to monitor mesh tunnel interfaces. This command restricts the output of the show mpls traffic-eng tunnels command to display only mesh tunnel interfaces. For example:

Router# show mpls traffic-eng tunnels property auto-tunnel mesh brief
 
   
Signalling Summary:
 LSP Tunnels Process:            running
 RSVP Process:                   running
 Forwarding:                     enabled
 Periodic reoptimization:        every 3600 seconds, next in 491 seconds
 Periodic FRR Promotion:         Not Running
 Periodic auto-bw collection:    disabled
TUNNEL NAME                      DESTINATION    UP IF     DOWN IF
STATE/PROT
router_t64336                    10.2.2.2        -        Se2/0
up/up
router_t64337                    10.3.3.3        -        Se2/0
up/up
Displayed 2 (of 2) heads, 0 (of 0) midpoints, 0 (of 0) tails
 
   

Step 3 show mpls traffic-eng auto-tunnel mesh

Use this command to display the cloned mesh tunnel interfaces of each autotemplate interface and the current range of mesh tunnel interface numbers. For example:

Router# show mpls traffic-eng auto-tunnel mesh
 
   
Auto-Template1:
 
   
 Using access-list 1 to clone the following tunnel interfaces:
 
   
  Destination  Interface
  -----------  ---------
  10.2.2.2     Tunnel64336
  10.3.3.3     Tunnel64337
 
   
Mesh tunnel interface numbers: min 64336 max 65337
 
   

Step 4 exit

Use this command to exit to user EXEC mode. For example:

Router# exit
Router>
 
   

Troubleshooting Tips

You can configure mesh tunnel interfaces directly. However, you cannot delete them manually, and manual configuration is not permanent. The configuration is overwritten when the template changes or the mesh tunnel interface is deleted and re-created. If you attempt to manually delete a mesh tunnel interface, an error message appears.

You can enter the show mpls traffic-eng tunnels destination address command to display information about tunnels that are destined for a specified IP address.

Enter the show mpls traffic-eng tunnels property auto-tunnel mesh command to display information about mesh tunnel interfaces.

Configuring IGP Flooding for Autotunnel Mesh Groups

Perform the following task to configure IGP flooding for autotunnel mesh groups. Use this task to configure an OSPF-based discovery for identifying mesh group members and advertising the mesh group IDs to all LSRs.

SUMMARY STEPS

1. enable

2. configure terminal

3. mpls traffic-eng auto-tunnel mesh

4. router ospf process-id

5. mpls traffic-eng mesh-group mesh-group-id interface-type interface-number area area-id

6. exit

7. Repeat steps 4 and 5 at other LSRs to advertise the mesh group numbers to which they belong.

8. interface auto-template interface-num

9. tunnel destination mesh-group mesh-group-id

10. 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 

mpls traffic-eng auto-tunnel mesh

Example:

Router(config)# mpls traffic-eng auto-tunnel mesh

Enables autotunnel mesh groups globally.

Step 4 

router ospf process-id

Example:

Router(config)# router ospf 100

Enters router configuration mode and configures an OSPF routing process.

The process-id argument is an internally used identification parameter for an OSPF routing process. It is locally assigned and can be any positive integer. A unique value is assigned for each OSPF routing process.

Step 5 

mpls traffic-eng mesh-group mesh-group-id interface-type interface-number area area-id

Example:

Router(config-router)# mpls traffic-eng mesh-group 10 loopback 0 area 100

Advertises the autotunnel mesh group number of an LSR.

The mesh-group-id is a number that identifies a specific mesh group.

The interface-type and interface-number arguments specify a type of interface and an interface number.

The area area-id keyword-argument pair identifies the area.

Step 6 

exit

Example:

Router(config-router)# exit

Exits to global configuration mode.

Step 7 

Repeat steps 4 and 5 at other LSRs to advertise the mesh group numbers to which they belong.

Step 8 

interface auto-template interface-num

Example:

Router(config)# interface auto-template 1

Creates a template interface and enters interface configuration mode.

The interface-num argument identifies the interface number. Valid values are from 1 to 25.

Step 9 

tunnel destination mesh-group mesh-group-id

Example:

Router(config-if)# tunnel destination mesh-group 10

Specifies a mesh group that a template interface uses to signal tunnels for all mesh group members.

The mesh-group-id is a number that identifies a specific mesh group.

Step 10 

end

Example:

Router(config-if)# end

Exits to privileged EXEC mode.

Configuration Examples for MPLS Traffic Engineering—Autotunnel Mesh Groups

This section contains the following configuration examples:

Configuring a Mesh of TE Tunnel LSPs: Examples

Specifying the Range of Mesh Tunnel Interface Numbers: Example

Configuring IGP Flooding for Autotunnel Mesh Groups: Example

Configuring a Mesh of TE Tunnel LSPs: Examples

This section contains the following configuration examples for configuring a mesh of TE tunnel LSP:

Enabling Autotunnel Mesh Groups Globally: Example

Creating an Access List Using a Name: Example

Creating an AutoTunnel Template Interface: Example

Enabling Autotunnel Mesh Groups Globally: Example

The following example shows how to enable autotunnel mesh groups globally:

configure terminal
!
 
   
mpls traffic-eng auto-tunnel mesh
end

Creating an Access List Using a Name: Example

The following examples shows how to create an access list using a name to determine the destination addresses for the mesh tunnel interfaces:

configure terminal
!
ip access-list standard a1
 permit 10.0.0.0 0.255.255.255
end
 
   

In this example, any IP address in the TE topology database that matches access list a1 causes the creation of a mesh tunnel interface with that destination address.

Creating an AutoTunnel Template Interface: Example

This example shows how to create an AutoTunnel template template interface. In the following example, an AutoTunnel template is created and configured with a typical set of TE commands. The mesh group created from the template consists of mesh tunnel interfaces with destination addresses that match access list a1.


Note The following example shows a typical configuration.


configure terminal
!
interface auto-template 1
 ip unnumbered Loopback0
 tunnel mode mpls 
 tunnel mpls traffic-eng autoroute announce
 tunnel mpls traffic-eng priority 1 1
 tunnel mpls traffic-eng auto-bw
 tunnel mpls traffic-eng path-option 1 dynamic
 tunnel destination access-list a1
 end

Specifying the Range of Mesh Tunnel Interface Numbers: Example

In the following example, the lowest mesh tunnel interface number can be 1000, and the highest mesh tunnel interface number can be 2000:

configure terminal
!
mpls traffic-eng auto-tunnel mesh tunnel-num min 1000 max 2000
end

Configuring IGP Flooding for Autotunnel Mesh Groups: Example

In the following example, OSPF is configured to advertise the router membership in mesh group 10:

configure terminal
!
mpls traffic-eng auto-tunnel mesh
router ospf 100
 mpls traffic-eng mesh-group 10 loopback 0 area 100
 exit
!
interface auto-template 1
 tunnel destination mesh-group 10
 end

Additional References

Related Documents

Related Topic
Document Title

MPLS traffic engineering command descriptions

Cisco IOS Multiprotocol Label Switching Command Reference


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

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


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport


Feature Information for MPLS Traffic Engineering—AutoTunnel Mesh Groups

Table 1 lists the release history for this feature.

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

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


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


Table 1 Feature Information for MPLS Traffic Engineering—AutoTunnel Mesh Groups 

Feature Name
Releases
Feature Information

MPLS Traffic Engineering—AutoTunnel Mesh Groups

12.0(27)S
12.0(29)S
12.2(33)SRA
12.2(33)SXH
12.4(20)T
12.2(33)SRE

The MPLS Traffic Engineering—AutoTunnel Mesh Groups feature allows a network administrator to configure TE LSPs.

In Cisco IOS Release 12.2(27)S, this feature was introduced.

In Cisco IOS Release 12.0(29)S, this feature was updated to include Interior Gateway Protocol (IGP) flooding of autotunnel mesh groups.

In Cisco IOS Release 12.2(33)SRA, this feature was integrated.

In Cisco IOS Release 12.2(33)SXH, support was added.

In Cisco IOS Release 12.4(20)T, this feature was integrated.

In Cisco IOS Release 12.2(33)SRE, this feature was integrated. A router with autotunnel mesh groups can be configured with stateful switchover (SSO) redundancy.


Glossary

CE router—customer edge router. A router that is part of a customer's network and interfaces to a provider edge (PE) router.

customer network—A network that is under the control of an end customer. Private addresses can be used in a customer network. Customer networks are logically isolated from each other and from the service provider's network.

edge router—A router at the edge of the network that receives and transmits packets. It can define the boundaries of the Multiprotocol Label Switching (MPLS) network.

headend—The label switch router (LSR) where a tunnel originates. The tunnel's "head" or tunnel interface resides at this LSR as well.

label—A short, fixed-length data construct that tells switching nodes how to forward data (packets).

label switched path (LSP) tunnel—A configured connection between two routers in which label switching is used to carry the packets.

LSP—label switched path. A path that a labeled packet follows over several hops, starting at an ingress LSR and ending at an egress LSR.

LSR—label switch router. A Layer 3 router that forwards a packet based on the value of a label encapsulated in the packet.

mesh group—A set of label switch routers (LSRs) that are members of a full or partial network of traffic engineering (TE) label switched paths (LSPs).

P router—provider core router.

PE router—provider edge router. A router at the edge of the service provider's network that interfaces to customer edge (CE) routers.

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.

tailend—The downstream, receive end of a tunnel.

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.

tunnel—A secure communication path between two peers, such as two routers. A traffic engineering tunnel is a label switched tunnel that is used for traffic engineering. Such a tunnel is set up through means other than normal Layer 3 routing.