Configuring GRE tunnel keepalive

Procedure

Enter global configuration mode.
```
device# configure terminal
```
Enter interface configuration mode and configure a tunnel.
```
device(config)# interface tunnel 5
```
Valid values range from from 1-1024.
Configure the keepalive interval and number of retries.
```
device(config-intf-tunnel-5)# keepalive time-interval 30 retry-count 2
```
Valid values for the interval range from 1-32767. Valid values for retries range from 1-255.