H3C Technologies H3C SecPath F1000-E - Manual (Page 71)

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[SecPathB-Tunnel0] source 11.1.1.2
[SecPathB-Tunnel0] destination 11.1.1.1
# Set the GRE key of Tunnel0 to 1.
[SecPathB-Tunnel0] gre key 1
[SecPathB-Tunnel0] quit
# Configure a static route to the headquarters network with the outgoing interface being Tunnel 0.
[SecPathB] ip route-static 172.17.17.0 255.255.255.0 tunnel 0
3. Configure SecPath C:
# Create tunnel interface Tunnel0 and configure an IP address for it.
system-view
[SecPathC] interface tunnel 0
[SecPathC-Tunnel0] ip address 192.168.22.3 255.255.255.0
# Configure the tunnel encapsulation mode of interface Tunnel0 as GRE over IPv4.
[SecPathC-Tunnel0] tunnel-protocol gre
# Configure the source and destination IP addresses of interface Tunnel0.
[SecPathC-Tunnel0] source 11.1.1.3
[SecPathC-Tunnel0] destination 11.1.1.1
# Set the GRE key of Tunnel0 to 2.
[SecPathC-Tunnel0] gre key 2
[SecPathC-Tunnel0] quit
# Configure a static route to the headquarters network with the outgoing interface being Tunnel 0.
[SecPathC] ip route-static 172.17.17.0 255.255.255.0 tunnel 0
Verifying the configuration
# On Host B, specify SecPath C as the default gateway. Ping Host A from Host B. The ping operation
succeeds. View tunnel entries on SecPath A:
[SecPathA] display gre p2mp tunnel-table interface tunnel 0
Dest Addr Mask Tunnel Dest Addr Gre Key
192.168.1.0 255.255.255.0 11.1.1.3 2
# On Host B, specify SecPath B as the default gateway.Ping Host A from Host B. The ping operation
succeeds. View tunnel entries on SecPath A:
[SecPathA] display gre p2mp tunnel-table interface tunnel 0
Dest Addr Mask Tunnel Dest Addr Gre Key
192.168.1.0 255.255.255.0 11.1.1.3 2
192.168.1.0 255.255.255.0 11.1.1.2 1
The output indicates that SecPath A has two tunnel entries to the branch network and prefers the tunnel
entry with a smaller GRE key value. Packets are forwarded to hosts on the branch network through
SecPath B first.
# On SecPath B, shut down interface Tunnel0 to cut off the tunnel link between SecPath A and SecPath
B.
[SecPathB] interface tunnel 0
[SecPathB-Tunnel0] shutdown
# On Host B, specify SecPath C as the default gateway. After the tunnel entry corresponding to SecPath
B ages out, ping Host A from Host B. The ping operation succeeds. View tunnel entries on SecPath A:
[SecPathA] display gre p2mp tunnel-table interface tunnel 0
Dest Addr Mask Tunnel Dest Addr Gre Key