Verification, Network requirements – H3C Technologies H3C SecPath F1000-E User Manual
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[DeviceB–GigabitEthernet1/1] quit
# Configure an IP address for interface GigabitEthernet 1/2.
[DeviceB] interface gigabitethernet 1/2
[DeviceB–GigabitEthernet1/2] ip address 192.168.12.1 255.255.255.0
[DeviceB–GigabitEthernet1/2] quit
# Create interface Tunnel 0 and configure an IP address for it.
[DeviceB] interface tunnel 0
[DeviceB-Tunnel0] ip address 192.168.22.2 255.255.255.0
# Configure the tunnel encapsulation mode as GRE over IPv4.
[DeviceB-Tunnel0] tunnel-protocol gre
# Configure the source IP address of interface Tunnel 0.
[DeviceB-Tunnel0] source 11.1.1.2
# Configure the destination IP address of interface Tunnel 0.
[DeviceB-Tunnel0] destination 11.1.1.1
[DeviceB-Tunnel0] quit
# Configure a static route to the headquarters network with the outgoing interface being Tunnel 0.
[DeviceB] ip route-static 192.168.11.0 255.255.255.0 tunnel 0
Verification
# After the above configurations, view the tunnel entry information on Device A. No tunnel entry exists.
[DeviceA] display gre p2mp tunnel-table interface tunnel 0
Dest Addr Mask Tunnel Dest Addr Gre Key
# Ping Host A from Host B. The operation succeeds.
# View tunnel entry information on Device A again. As the branch has initiated the establishment of the
tunnel by sending packets to the headquarters, a tunnel entry should be installed, as shown in the
following output information:
[DeviceA] display gre p2mp tunnel-table interface tunnel 0
Dest Addr Mask Tunnel Dest Addr Gre Key
192.168.12.0 255.255.255.0 11.1.1.2
Configuration Example for P2MP GRE Tunnel Backup at the
Headquarters
Network requirements
As shown in
, the headquarters uses two gateways at the egress of the internal network, with
Device B for backup. Two GRE tunnels are created on Device C, the gateway at the branch, one for
connecting Device A and the other for connecting Device B. Normally, packets are forwarded along the
tunnel between Device A and Device C. When a failure occurs along this path, the tunnel between
Device B and Device C is used to transmit packets.
To meet the above requirements, you need to establish a P2MP GRE tunnel with the branch on both
Device A and Device B, establish a GRE over IPv4 tunnel between Device A and Device B, and on Device
A configure the tunnel interface of the GRE over IPv4 tunnel as the backup interface of the P2MP GRE
tunnel interface. Thus, when Device A cannot find the corresponding tunnel entry for a packet, it delivers
the packet to Device B, which then forwards the packet to Device C.