H3C Technologies H3C SecPath F1000-E - Manual (Page 30)

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Figure 17 Network diagram for P2MP GRE tunnel backup at a branch
GE1/1
GE1/1
Device B
Device C
(Backup gateway)
IPv4 network
Device A
GE1/1 GE1/2
Tunnel0
Tunnel0
Tunnel0
Host B
Host A
GE1/2
GE1/2
Headquarters
Branch
GRE P2MP tunnel
Device Interface IP Address Device Interface IP Address
Device A GE1/1 11.1.1.1/24 Device B GE1/1 11.1.1.2/24
GE1/2 172.17.17.1/24 GE1/2 192.168.1.2/24
Tunnel0 192.168.22.1/24 Tunnel0 192.168.22.2/24
Device C GE1/1 11.1.1.3/24 Device C Tunnel0 192.168.22.3/24
GE1/2 192.168.1.3/24
Configuration procedure
Configure IP addresses and masks for interfaces as per Figure 17 . (Omitted)
Step1 Configure Device A
# Create interface Tunnel 0 and configure an IP address for it.
<DeviceA> system-view
[DeviceA] interface tunnel 0
[DeviceA-Tunnel0] ip address 192.168.22.1 255.255.255.0
# Configure the tunnel encapsulation mode of interface Tunnel 0 as P2MP GRE.
[DeviceA-Tunnel0] tunnel-protocol gre p2mp
# Configure the mask of the branch network connected to Tunnel 0 as 255.255.255.0.
[DeviceA-Tunnel0] gre p2mp branch-network-mask 255.255.255.0
# Set the tunnel entry aging time to 20 seconds.
[DeviceA-Tunnel0] gre p2mp aging-time 20
# Configure the source IP address of interface Tunnel 0.
[DeviceA-Tunnel0] source 11.1.1.1
[DeviceA-Tunnel0] quit
# Configure a static route to the branch network with the outgoing interface being Tunnel 0.
[DeviceA] ip route-static 192.168.1.0 255.255.255.0 tunnel 0
Step2 Configure Device B
# Create interface Tunnel 0 and configure an IP address for it.
<DeviceB> system-view
[DeviceB] interface tunnel 0
[DeviceB-Tunnel0] ip address 192.168.22.2 255.255.255.0
# Configure the tunnel encapsulation mode of interface Tunnel 0 as GRE over IPv4.