H3C Technologies H3C SecPath F1000-E - Manual (Page 743)

7
Item Description
Keepalive
Enable or disable the GRE keepalive function.
With the GRE keepalive function enabled on a tunnel interface, the device sends
GRE keepalive packets from the tunnel interface periodically. If no response is
received from the peer within the specified interval, the device retransmits the
keepalive packet. If the device still receives no response from the peer after sending
the keepalive packet for the maximum number of attempts, the local tunnel interface
goes down and stays down until it receives a keepalive acknowledgement packet
from the peer.
Keepalive Interval
Number of Retries
Specify the interval between sending the keepalive packets and the maximum
number of transmission attempts.
The two configuration items are available when you select Enable for the GRE
keepalive function.
Return to GRE over IPv4 tunnel configuration task list .
GRE over IPv4 Tunnel Configuration Example
Network requirements
As shown in Figure 10 , Device A and Device B are interconnected through the Internet. Two private IP
subnets Group 1 and Group 2 are interconnected through a GRE tunnel between Device A and Device
B.
Figure 10 Network diagram for a GRE over IPv4 tunnel
Configuration procedure
NOTE:
Before the configuration, make sure that Device A and Device B are reachable to each other.
Step1 Configure Device A
# Configure an IPv4 address for each interface and assign the interfaces to security zones (omitted).
# Create a GRE tunnel interface.
• Select VPN > GRE > GRE from the navigation tree and then click Add to perform the
configurations shown in
Figure 11 .