- Read Me First
- MPLS Traffic Engineering and Enhancements
- MPLS Traffic Engineering Configurable Path Calculation Metric for Tunnels
- MPLS Traffic Engineering--Scalability Enhancements
- MPLS Traffic Engineering--LSP Attributes
- MPLS Traffic Engineering AutoTunnel Mesh Groups
- MPLS Traffic Engineering Verbatim Path Support
- MPLS Traffic Engineering--RSVP Hello State Timer
- MPLS Traffic Engineering Forwarding Adjacency
- MPLS Traffic Engineering Class-based Tunnel Selection
- MPLS Traffic Engineering Interarea Tunnels
- MPLS Traffic Engineering Static IPv6 Routes over MPLS TE IPv4 Tunnels
- MPLS Traffic Engineering Automatic Bandwidth Adjustment for TE Tunnels
- MPLS Traffic Engineering – Bundled Interface Support
- RSVP Refresh Reduction and Reliable Messaging
- Finding Feature Information
- Prerequisites for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Restrictions for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Information About MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- How to Configure MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Configuring a Device to Support Traffic Engineering Tunnels
- Configuring IS-IS or OSPF for MPLS Traffic Engineering
- Configuring Bandwidth on Each Link That a Tunnel Crosses
- Configuring an MPLS Traffic Engineering Tunnel
- Enabling Automatic Bandwidth Adjustment on a Platform
- Enabling Automatic Bandwidth Adjustment for a Tunnel
- Configuring the Interval for Computing the Tunnel Average Output Rate
- Verifying Automatic Bandwidth Configuration
- Configuration Examples for MPLS TE Automatic Bandwidth Adjustments for TE Tunnels
- Additional References
- Feature Information for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
MPLS Traffic Engineering Automatic Bandwidth Adjustment for TE Tunnels
The MPLS Traffic Engineering (TE) Automatic Bandwidth Adjustment for TE Tunnels feature provides the means to automatically adjust the bandwidth allocation for traffic engineering tunnels based on their measured traffic load. The configured bandwidth in the running configuration is changed due to the automatic bandwidth behavior.
- Finding Feature Information
- Prerequisites for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Restrictions for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Information About MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- How to Configure MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Configuration Examples for MPLS TE Automatic Bandwidth Adjustments for TE Tunnels
- Additional References
- Feature Information for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
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.
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 MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
Your network must support the following:
Multiprotocol Label Switching (MPLS) traffic engineering (TE) tunnels
Cisco Express Forwarding
Intermediate System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF)
MPLS TE must be configured on the interface and on the tunnels.
Restrictions for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
The automatic bandwidth adjustment feature treats each tunnel for which it has been enabled independently. That is, it adjusts the bandwidth for each such tunnel according to the adjustment frequency configured for the tunnel and the sampled output rate for the tunnel since the last adjustment without regard for any adjustments previously made or pending for other tunnels.
If a tunnel is brought down to calculate a new label switched path (LSP) because the LSP is not operational, the configured bandwidth is not saved. If the router is reloaded, the last saved automatic bandwidth value is used.
You cannot configure MPLS TE over the logical generic routing encapsulation (GRE) tunnel interface.
MPLS traffic engineering supports only a single IGP process/instance. Multiple IGP processes/instances are not supported and MPLS traffic engineering should not be configured in more than one IGP process/instance.
Information About MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- MPLS TE Automatic Bandwidth Adjustment for TE Tunnels Overview
- MPLS TE Automatic Bandwidth Adjustment for TE Tunnels Benefits
MPLS TE Automatic Bandwidth Adjustment for TE Tunnels Overview
Traffic engineering autobandwidth samples the average output rate for each tunnel marked for automatic bandwidth adjustment. For each marked tunnel, the feature periodically (for example, once per day) adjusts the tunnel’s allocated bandwidth to be the largest sample for the tunnel since the last adjustment.
The frequency with which tunnel bandwidth is adjusted and the allowable range of adjustments is configurable on a per-tunnel basis. In addition, the sampling interval and the interval over which to average tunnel traffic to obtain the average output rate is user-configurable on a per-tunnel basis.
MPLS TE Automatic Bandwidth Adjustment for TE Tunnels Benefits
The automatic bandwidth feature allows you to configure and monitor the bandwidth for MPLS TE tunnels. If automatic bandwidth is configured for a tunnel, TE automatically adjusts the tunnel’s bandwidth.
How to Configure MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
- Configuring a Device to Support Traffic Engineering Tunnels
- Configuring IS-IS or OSPF for MPLS Traffic Engineering
- Configuring Bandwidth on Each Link That a Tunnel Crosses
- Configuring an MPLS Traffic Engineering Tunnel
- Enabling Automatic Bandwidth Adjustment on a Platform
- Enabling Automatic Bandwidth Adjustment for a Tunnel
- Configuring the Interval for Computing the Tunnel Average Output Rate
- Verifying Automatic Bandwidth Configuration
Configuring a Device to Support Traffic Engineering Tunnels
1.
enable
2.
configure
terminal
3.
ip
cef
distributed
4.
mpls
traffic-eng
tunnels
5.
exit
DETAILED STEPS
Configuring IS-IS or OSPF for MPLS Traffic Engineering
Perform one of the follow tasks to configure IS-IS or OSPF for MPLS TE:
Configuring IS-IS for MPLS Traffic Engineering
1.
enable
2.
configure
terminal
3.
router
isis
4.
mpls
traffic-eng
level-1
5.
mpls
traffic-eng
router-id
loopback0
6.
metric-style
wide
7.
exit
8.
exit
DETAILED STEPS
Configuring OSPF for MPLS Traffic Engineering
1.
enable
2.
configure
terminal
3.
router
ospf
process-id
4.
mpls
traffic-eng
area
number
5.
mpls
traffic-eng
router-id
loopback0
6.
exit
7.
exit
DETAILED STEPS
Configuring Bandwidth on Each Link That a Tunnel Crosses
1.
enable
2.
configure
terminal
3.
interface
type
number
4.
mpls
traffic-eng
tunnels
5.
ip
rsvp
bandwidth
[interface-kbps] [single-flow-kbps] [sub-pool kbps]
6.
exit
7.
exit
DETAILED STEPS
Configuring an MPLS Traffic Engineering Tunnel
To configure an MPLS TE tunnel, perform the following task. The MPLS TE tunnel has two path setup options: a preferred explicit path and a backup dynamic path.
Note | The configuration applies only to the TE head-end node. The configuration applies to all nodes and interfaces in the network. |
1.
enable
2.
configure
terminal
3.
interface
tunnel
number
4.
ip
unnumbered
interface-type
interface-number
5.
tunnel
destination
ip-address
6.
tunnel
mode
mpls
traffic-eng
7.
tunnel
mpls
traffic-eng
bandwidth
bandwidth
8.
tunnel
mpls
traffic-eng
path-option
[protect] preference-number{dynamic | explicit | {name path-name | path-number}} [lockdown]
9.
exit
10.
exit
DETAILED STEPS
Troubleshooting Tips
Each tunnel mpls traffic-eng auto-bw command supersedes the previous one. Therefore, if you want to specify multiple options for a tunnel, you must specify them all in a single tunnel mpls traffic-eng auto-bw command.
Enabling Automatic Bandwidth Adjustment on a Platform
To enable automatic bandwidth adjustment on a platform and initiate sampling the output rate for tunnels configured for bandwidth adjustment, perform the following task.
Note | This task is applicable only to the TE head-end router. The configuration applies to all locally-configured TE head-end interfaces. |
1.
enable
2.
configure
terminal
3.
mpls
traffic-eng
auto-bw
timers
[frequency seconds]
4.
no
mpls
traffic-eng
auto-bw
timers
5.
exit
DETAILED STEPS
Command or Action | Purpose | |
---|---|---|
Step 1 |
enable
Example: Router> enable |
Enables privileged EXEC mode.
|
Step 2 |
configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. |
Step 3 |
mpls
traffic-eng
auto-bw
timers
[frequency seconds] Example: Router(config)# mpls traffic-eng auto-bw timers frequency 300 |
Enables automatic bandwidth adjustment on a platform and begins sampling the output rate for tunnels that have been configured for automatic bandwidth adjustment.
|
Step 4 |
no
mpls
traffic-eng
auto-bw
timers
Example: Router(config)# no mpls traffic-eng auto-bw timers |
(Optional) Disables automatic bandwidth adjustment on a platform.
|
Step 5 |
exit
Example: Router(config)# exit |
Exits to privileged EXEC mode. |
Enabling Automatic Bandwidth Adjustment for a Tunnel
1.
enable
2.
configure
terminal
3.
interface
tunnel
number
4.
tunnel
mpls
traffic-eng
auto-bw
[collect-bw]
[frequency
seconds
] [adjustment-threshold percent] [overflow-limit number overflow-threshold percent] [max-bw kbps] [min-bw kbps]
5.
exit
6.
exit
DETAILED STEPS
Command or Action | Purpose | |
---|---|---|
Step 1 |
enable
Example: Router> enable |
Enables privileged EXEC mode.
|
Step 2 |
configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface
tunnel
number
Example:
Router(config)# interface tunnel 1
|
Configures a tunnel interface and enters interface configuration mode. |
Step 4 |
tunnel
mpls
traffic-eng
auto-bw
[collect-bw]
[frequency
seconds
] [adjustment-threshold percent] [overflow-limit number overflow-threshold percent] [max-bw kbps] [min-bw kbps] Example: Router(config-if)# tunnel mpls traffic-eng auto-bw max-bw 2000 min-bw 1000 |
Enables automatic bandwidth adjustment for the tunnel and controls the manner in which the bandwidth for a tunnel is adjusted. |
Step 5 |
exit
Example: Router(config-if)# exit |
Exits to global configuration mode. |
Step 6 |
exit
Example: Router(config)# exit |
Exits to privileged EXEC mode. |
Configuring the Interval for Computing the Tunnel Average Output Rate
1.
enable
2.
configure
terminal
3.
interface
tunnel
number
4.
load-interval
seconds
5.
exit
6.
exit
DETAILED STEPS
Command or Action | Purpose | |
---|---|---|
Step 1 |
enable
Example: Router> enable |
Enables privileged EXEC mode.
|
Step 2 |
configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface
tunnel
number
Example:
Router(config)# interface tunnel 1
|
Configures a tunnel interface and enters interface configuration mode. |
Step 4 |
load-interval
seconds
Example: Router(config-if)# load-interval 90 |
Configures the interval over which the input and output rates for the interface are averaged.
|
Step 5 |
exit
Example: Router(config-if)# exit |
Exits to global configuration mode. |
Step 6 |
exit
Example: Router(config)# exit |
Exits to privileged EXEC mode. |
Verifying Automatic Bandwidth Configuration
1.
show
mpls
traffic-eng
tunnels
2.
show
running-config
DETAILED STEPS
Step 1 |
show
mpls
traffic-eng
tunnels
Use this command to display information about tunnels, including automatic bandwidth information for tunnels that have the feature enabled. For example: Example: Router# show mpls traffic-eng tunnels Name:tagsw4500-9_t1 (Tunnel1) Destination:10.0.0.4 Status: Admin:up Oper:up Path:valid Signalling:connected path option 1, type explicit pbr_south (Basis for Setup, path weight 30) path option 2, type dynamic Config Parameters: Bandwidth:13 kbps (Global) Priority:7 7 Affinity:0x0/0xFFFF AutoRoute: disabled LockDown:disabled Loadshare:13 bw-based auto-bw:(300/265) 53 Bandwidth Requested: 13 Adjustment threshold: 5% Overflow Limit: 4 Overflow Threshold: 25% Overflow Threshold Crossed: 1 Sample Missed: 1 Samples Collected: 1 Active Path Option Parameters: State: dynamic path option 1 is active BandwidthOverride: disabled LockDown: disabled Verbatim: disabled InLabel : - OutLabel : Serial3/0, 18 RSVP Signalling Info: Src 10.0.0.1, Dst 10.0.0.4, Tun_Id 2, Tun_Instance 2 RSVP Path Info: My Address: 10.105.0.1 Explicit Route: 10.105.0.2 104.105.0.1 10.0.0.4 Record Route: NONE Tspec: ave rate=13 kbits, burst=1000 bytes, peak rate=13 kbits Record Route: NONE Tspec: ave rate=13 kbits, burst=1000 bytes, peak rate=13 kbits RSVP Resv Info: Record Route: NONE Fspec: ave rate=13 kbits, burst=1000 bytes, peak rate=13 kbits Shortest Unconstrained Path Info: Path Weight: 128 (TE) Explicit Route: 10.105.0.2 104.105.0.1 10.0.0.4 History: Tunnel: Time since created: 7 minutes, 56 seconds Time since path change: 7 minutes, 18 seconds Number of LSP IDs (Tun_Instances) used: 2 Number of Auto-bw Adjustment resize requests: 1 Time since last Auto-bw Adjustment resize request: 1 minutes, 7 seconds Number of Auto-bw Overflow resize requests: 1 Time since last Auto-bw Overflow resize request: 52 seconds Current LSP: Uptime: 52 seconds Selection: reoptimization Prior LSP: ID: path option 1 [1] Removal Trigger: configuration changed
In the command output:
Example: |
Step 2 |
show
running-config
Use this command to verify that the tunnel mpls traffic-eng auto bw command is as you expected. For example: Example: Router# show running-config . . . interface tunnel1 ip unnumbered loopback 0 tunnel destination 192.168.17.17 255.255.255.0 tunnel mode mpls traffic-eng tunnel mpls traffic-eng bandwidth 1500 tunnel mpls traffic-eng priority 1 1 tunnel mpls traffic-eng path-option 1 dynamic tunnel mpls traffic-eng auto bw max-bw 2000 min-bw 1000 !Enable automatic bandwidth Example: . . . The sample output from the show running-config command shows that the value 1500, in the tunnel mpls traffic-eng bandwidth 1500 command, changes after an adjustment is made. Example: |
Configuration Examples for MPLS TE Automatic Bandwidth Adjustments for TE Tunnels
The figure below illustrates a sample MPLS topology. The following sections contain sample configuration examples to configure automatic bandwidth adjustment for MPLS TE tunnels originating on Router 1 and to enable automatic bandwidth adjustment for Tunnel 1.
The examples omit some configuration required for MPLS TE, such as the required RSVP and Interior Gateway Protocol (IGP) (IS-IS or OSPF) configuration, because the purpose of these examples is to illustrate the configuration for automatic bandwidth adjustment.
- Example: Configuring MPLS Traffic Engineering Automatic Bandwidth
- Example: Tunnel Configuration for Automatic Bandwidth
Example: Configuring MPLS Traffic Engineering Automatic Bandwidth
The following example shows how to use the mpls traffic-eng auto-bw timers command to enable automatic bandwidth adjustment for Router 1. The command specifies that the output rate is to be sampled every 10 minutes for tunnels configured for automatic bandwidth adjustment.
configure terminal ! ip cef distributed mpls traffic-eng tunnels mpls traffic-eng auto-bw timers frequency 600 !Enable automatic bandwidth adjustment interface loopback 0 ip address 192.168.11.11 255.255.255.0
Example: Tunnel Configuration for Automatic Bandwidth
The following example shows how to use the tunnel mpls traffic-eng auto-bw command to enable automatic bandwidth adjustment for Tunnel 1. The command specifies a maximum allowable bandwidth of 2000 kbps, a minimum allowable bandwidth of 1000 kbps, and that the default automatic bandwidth adjustment frequency of once a day be used.
interface tunnel1 ip unnumbered loopback 0 tunnel destination 192.168.17.17 tunnel mode mpls traffic-eng tunnel mpls traffic-eng bandwidth 1500 tunnel mpls traffic-eng priority 1 1 tunnel mpls traffic-eng path-option 1 dynamic tunnel mpls traffic-eng auto-bw max-bw 2000 min-bw 1000 !Enable automatic bandwidth !adjustment for Tunnel1
Additional References
Related Documents
Related Topic |
Document Title |
---|---|
IS-IS and OSPF commands |
Cisco IOS IP Routing Protocols Command Reference |
MPLS commands |
Cisco IOS Multiprotocol Label Switching Command Reference |
Quality of service solutions commands |
Cisco IOS Quality of Service Solutions Command Reference |
Quality of service solutions configuration |
Quality of Service Overview |
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 |
---|---|
MPLS Traffic Engineering MIB |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs
RFC |
Title |
---|---|
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified. |
-- |
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. |
Feature Information for MPLS TE Automatic Bandwidth Adjustment for TE Tunnels
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.
Feature Name |
Releases |
Feature Information |
---|---|---|
MPLS Traffic Engineering Automatic Bandwidth Adjustment for TE Tunnels |
12.2(33)SRE Cisco IOS XE Release 3.8S Cisco IOS XE Release 3.9S |
The MPLS Traffic Engineering Automatic Bandwidth Adjustment for TE Tunnels feature provides the means to automatically adjust the bandwidth allocation for traffic engineering tunnels based on their measured traffic load. The configured bandwidth in the running configuration is changed due to the automatic bandwidth behavior. In Cisco IOS Release 12.2(33)SRE, this feature was introduced. In Cisco IOS XE Release 3.8S, support was added for the Cisco ISR 4400 Series Routers. In Cisco IOS XE Release 3.9S, support was added for the Cisco CSR 1000V. The following commands were introduced or modified to support automatic bandwidth adjustment threshold and overflow threshold: mpls traffic-eng lsp attributes, show mpls traffic-eng tunnels, tunnel mpls traffic-eng auto-bw. |