Configuring HDLC and PPP encapsulation on WAN interfaces typically involves configuring the appropriate encapsulation type on the routers or networking devices connecting the WAN links. Below are the basic steps for configuring HDLC and PPP encapsulation on WAN interfaces using Cisco IOS commands as an example:
1. Configuring HDLC Encapsulation:
```bash Router(config)# interface serial interface_number Router(config-if)# encapsulation hdlc Router(config-if)# no shutdown ```
2. Configuring PPP Encapsulation:
```bash Router(config)# interface serial interface_number Router(config-if)# encapsulation ppp Router(config-if)# ppp authentication {chap | pap} {username password | if-needed} Router(config-if)# no shutdown ```
3. Verifying the Configuration:
You can verify the configuration by using the `show interfaces` command to check the status and configuration of the WAN interfaces:
```bash Router# show interfaces serial interface_number ```
This command displays information about the configured encapsulation type, interface status, and other parameters.
4. Optional Configuration:
It's important to ensure that the configurations are applied consistently on both ends of the WAN link to establish proper communication. Additionally, consider any security and compatibility requirements when selecting the encapsulation type and authentication method for your WAN interfaces.