H3C Technologies H3C SecPath F1000-E - Manual (Page 37)

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This not only ensures better cooperation of devices from different vendors, but also helps avoid
repetitive investments on branch node devices.
• High reliability. It supports GRE tunnel backup at the headquarters and branches, improving the
network reliability.
The P2MP GRE tunnel technology has the following restrictions:
• Both the transport protocol and passenger protocol must be IPv4.
• The headquarters node cannot send packets to a branch before the branch sends packets to it. Only
after receiving a packet from the branch, can the headquarters node installs a tunnel entry for the
branch and send packets to the branch.
• No tunnel can be established between branch nodes and therefore branch nodes cannot
communicate with each.
Configuring a P2MP GRE tunnel in the web
interface
Configuration prerequisites
On each of the peer devices, configure an IP address for the interface to be used as the source interface
of the tunnel interface (which can be a, for example, VLAN interface, GigabitEthernet interface, or
loopback interface), and make sure that this interface can communicate with the interface used as the
source interface of the tunnel interface on the peer device normally.
Configuration task list
Task Remarks
Configuring a P2MP GRE tunnel
interface
Required
Create a P2MP GRE tunnel interface and configure the related
parameters.