H3C Technologies H3C SecPath F1000-E - Manual (Page 23)

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• When configuring a route through the tunnel, you can configure a static route, using the address of
the network segment that the original packet is destined for as its destination address and the
address of the peer tunnel interface as its next hop. Or, you can enable a dynamic routing protocol
on both the tunnel interface and the interface connecting the private network, so that the dynamic
routing protocol can establish a routing entry that instructs the device to forward packets through the
tunnel. It is not allowed to set up a static route whose destination address is in the subnet of the
tunnel interface.
Displaying and Maintaining P2MP GRE Tunnels
To do… Use the command… Remarks
Display the tunnel entry
information of a P2MP GRE tunnel
interface
display gre p2mp
tunnel-table interface tunnel
number
Available in any view
Clear the tunnel entry information
of a P2MP GRE tunnel interface
reset gre p2mp tunnel-table
[ interface tunnel number
[ dest-address
tunnel-dest-address] ]
Available in user view
P2MP GRE Tunnel Configuration Examples
Basic P2MP GRE Tunnel Configuration Example
Network requirements
A company has a network at the headquarters and each of its branches. It is required to implement
communication between the headquarters and the branches through GRE, while communication
between the branches is not allowed. Figure 15 shows a simplified scenario, where there is only one
branch.
• Device A is the gateway at the headquarters, and Device B is the gateway of the branch.
• Host A is an internal user at the headquarters and Host B is an internal user at the branch. A GRE
tunnel is established between Device A and Device B to implement intercommunication between
Host A and Host B.
If you use P2P GRE tunnels, the number of GRE tunnels to be configured is the same as that of the
branches. To simplify the configuration at the headquarters, you can create a P2MP GRE tunnel interface
on Device A, and configure a GRE over IPv4 tunnel interface on Device B.
NOTE:
This example gives only the configuration on Device B. The configuration on other branch gateways is
similar.