The link-alive command enables the link-alive function on a GRE tunnel.
The undo link-alive command disables the link-alive function on a GRE tunnel.
By default, the link-alive function is disabled on a GRE tunnel.
| Parameter | Description | Value |
|---|---|---|
| period | Specifies the interval for sending link-alive packets. | The value is an integer that ranges from 1 to 32767, in seconds. The default value is 5. |
| retry-times retry-times | Specifies the tunnel-unreachable counter value. | The value is an integer that ranges from 1 to 255. The default value is 3. |
The link-alive function takes effect on a GRE tunnel immediately after you run the link-alive command on the tunnel interface. After you run the undo link-alive command, the link-alive function immediately becomes invalid. The source end of a GRE tunnel periodically sends link-alive packets. The tunnel-unreachable counter increases by 1 every time a link-alive packet is sent. If the source end does not receive any response packet when the tunnel-unreachable counter value reaches retry-times, the source end considers the remote end unreachable.
# Enable the link-alive function on a GRE tunnel and retain the default parameter values.
<HUAWEI> system-view [HUAWEI] interface tunnel 1 [HUAWEI-Tunnel1] tunnel-protocol gre [HUAWEI-Tunnel1] link-alive
# Disable the link-alive function on a GRE tunnel.
<HUAWEI> system-view [HUAWEI] interface tunnel 1 [HUAWEI-Tunnel1] undo link-alive
# Enable the link-alive function on a GRE tunnel. Set the interval for sending link-alive packets to 12 seconds and retain the default tunnel-unreachable counter value.
<HUAWEI> system-view [HUAWEI] interface tunnel 1 [HUAWEI-Tunnel1] link-alive period 12
# Enable the link-alive function on a GRE tunnel. Set the interval for sending link-alive packets to 12 seconds and the tunnel-unreachable counter to 4.
<HUAWEI> system-view [HUAWEI] interface tunnel 1 [HUAWEI-Tunnel1] link-alive period 12 retry-times 4