Changing the LDP Hello Interval

You can change the default setting for the LDP Hello message interval globally for link or target LDP sessions. You can also configure the interval on an interface for link LDP sessions.

To change the global link and target intervals for LDP Hello messages, and configure a link interval for an interface, perform the following steps.

In privileged EXEC mode, enter global configuration mode.
```
device# configure terminal
```
Enable MPLS on the device.
```
device(config)# router mpls
```
Access LDP configuration mode.
```
device(config-router-mpls)# ldp
```
Change the interval for the link sessions.
```
device(config-router-mpls-ldp)# hello-interval-link 10
```
In this example, the hello interval set to 10. The default value is 5. You can enter an integer from 1 through 32767.
Note
The Hello interval for link sessions can be overridden on a per-interface basis.
Change the interval for the target sessions.
```
device(config-router-mpls-ldp)# hello-interval-target 20
```
In this example, the hello interval set to 20. The default value is 15. You can enter an integer from 1 through 32767. The change takes effect immediately.
Note
This value can only be set globally for all targeted LDP sessions on the router. Per-interface configuration is only available for Link LDP sessions.
Access MPLS mode.
```
device(config-router-mpls-ldp)# exit
```
Enable MPLS on an interface.
```
device(config-router-mpls)# mpls-interface ethernet 0/2
```
For example, MPLS is enabled on interface on Ethernet port 0/2.

Configure LDP parameters on the interface.

device(config-router-mpls-interface-0/2)# ldp-params

Change the interval for link sessions on the interface.
```
device(config-router-mpls-interface-0/2-ldp-params)# hello-interval 15
```
In this example, the hello interval set on this interface for LDP Link Hello messages is set to 15 seconds. You can enter an integer from 1 through 65535. No default value exists for this parameter. However, when no value is set for this parameter, it defaults to the global LDP Hello interval. When you set a hello interval on the interface, it overrides the global LDP Hello interval.

Example

The following example shows the previous steps to configure the LDP Hello interval.

device# configure terminal
device(config)# router mpls
device(config-router-mpls)# ldp
device(config-router-mpls-ldp)# hello-interval-link 10
device(config-router-mpls-ldp)# hello-interval-target 20
device(config-router-mpls-ldp)# exit
device(config-router-mpls)# mpls-interface ethernet 0/2
device(config-router-mpls-interface-0/2)# ldp-params
device(config-router-mpls-interface-0/2-ldp-params)# hello-interval 15