I. Networking requirements
Router H3C A and router H3C B are connected over the Internet. Two private subnets, Group 1 and Group 2, are interconnected through a GRE tunnel between the two routers.
2. The following figure shows the network topology.
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3. configuration steps
Before starting the following configuration, make sure that the routes between H3C A and H3C B are reachable.
(1) Configure router H3C
# Configure the interface Ethernet1/1.
<H3C A> system-view
[H3C A] interface ethernet 1/1
[H3C A-Ethernet1/1] ip address 10.1.1.1 255.255.255.0
[H3C Co., A-Ethernet1/1] quit
# Configure the actual physical interface of the serial/0 tunnel interface ).
[H3C A] interface serial 2/0
[H3C A-Serial2/0] ip address 1.1.1.1 255.255.255.0
[H3C A-Serial2/0] quit
# Create Tunnel0 interface.
[H3C A] interface tunnel 0
# Configure the IP address of the Tunnel0 interface.
[H3C A-Tunnel0] ip address 10.1.2.1 255.255.255.0
# Configure the Tunnel encapsulation mode.
[H3C A-Tunnel0] tunnel-protocol gre
# Configure the source IP address of the Tunnel0 interface (IP address of serial/0 ).
[H3C A-Tunnel0] source 1.1.1.1
# Configure the IP address of the destination address of the Tunnel0 interface (the IP address of serial/1 of H3C B ).
[H3C A-Tunnel0] destination 2.2.2.2
[H3C A-Tunnel0] quit
# Configure A static route from H3C A to Group 2 through Tunnel0 interface.
[H3C A] ip route-static 10.1.3.0 255.255.255.0 tunnel 0
(2) Configure router H3C B
# Configure the interface Ethernet1/1.
<H3C B> system-view
[H3C B] API ethernet 1/1
[H3C B-Ethernet1/1] ip address 10.1.3.1 255.255.255.0
[H3C Co., B-Ethernet1/1] quit
# Configure the actual physical interface of the serial/1 tunnel interface ).
[H3C B] interface serial 2/1
[H3C B-Serial2/1] ip address 2.2.2.2 255.255.255.0
[H3C Co., B-Serial2/1] quit
# Create Tunnel0 interface.
[H3C B] interface tunnel 0
# Configure the IP address of the Tunnel0 interface.
[H3C B-Tunnel0] ip address 10.1.2.2 255.255.255.0
# Configure the Tunnel encapsulation mode.
[H3C B-Tunnel0] tunnel-protocol gre
# Configure the source IP address of the Tunnel0 interface serial/1 ).
[H3C B-Tunnel0] source 2.2.2.2
# Configure the IP address of the destination address of the Tunnel0 interface (H3C A's serial/0 ).
[H3C B-Tunnel0] destination 1.1.1.1
[H3C B-Tunnel0] quit
# Configure a static route from H3C B to Group 1 through Tunnel0 interface.
[H3C B] ip route-static 10.1.1.0 255.255.255.0 tunnel 0
Iv. Verify Configuration results
After completing the preceding configuration, view the Tunnel interface status of H3C A and H3C B respectively.
[H3C A] display interface tunnel 0
Tunnel0 current state: UP
Line protocol current state: UP
Description: Tunnel0 Interface
The Maximum Transmit Unit is 1476
Internet Address is 10.1.2.1/24 Primary
Encapsulation is TUNNEL, service-loopback-group ID not set.
Tunnel source 1.1.1.1, destination 2.2.2.2
Tunnel keepalive disabled
Tunnel protocol/transport GRE/IP
GRE key disabled
Checksumming of GRE packets disabled
Output queue: (Urgent queuing: Size/Length/Discards) 0/100/0
Output queue: (Protocol queuing: Size/Length/Discards) 0/500/0
Output queue: (FIFO queuing: Size/Length/Discards) 0/75/0
Last clearing of counters: Never
Last 300 seconds input: 0 bytes/sec, 0 packets/sec
Last 300 seconds output: 0 bytes/sec, 0 packets/sec
10 packets input, 840 bytes
0 input error
10 packets output, 840 bytes
0 output error
[H3C B] display interface tunnel 0
Tunnel0 current state: UP
Line protocol current state: UP
Description: Tunnel0 Interface
The Maximum Transmit Unit is 1476
Internet Address is 10.1.2.2/24 Primary
Encapsulation is TUNNEL, service-loopback-group ID not set.
Tunnel source 2.2.2.2, destination 1.1.1.1
Tunnel keepalive disabled
Tunnel protocol/transport GRE/IP
GRE key disabled
Checksumming of GRE packets disabled
Output queue: (Urgent queuing: Size/Length/Discards) 0/100/0
Output queue: (Protocol queuing: Size/Length/Discards) 0/500/0
Output queue: (FIFO queuing: Size/Length/Discards) 0/75/0
Last clearing of counters: Never
Last 300 seconds input: 2 bytes/sec, 0 packets/sec
Last 300 seconds output: 2 bytes/sec, 0 packets/sec
10 packets input, 840 bytes
0 input error
10 packets output, 840 bytes
0 output error
# From H3C B, Ping the address of the Ethernet1/1 interface on H3C.
[H3C B] ping 10.1.1.1
PING 10.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 10.1.1.1: bytes = 56 Sequence = 1 ttl = 255 time = 2 MS
Reply from 10.1.1.1: bytes = 56 Sequence = 2 ttl = 255 time = 2 MS
Reply from 10.1.1.1: bytes = 56 Sequence = 3 ttl = 255 time = 2 MS
Reply from 10.1.1.1: bytes = 56 Sequence = 4 ttl = 255 time = 2 MS
Reply from 10.1.1.1: bytes = 56 Sequence = 5 ttl = 255 time = 2 MS
--- 10.1.1.1 ping statistics ---
5 packet (s) transmitted
5 packet (s) received
0.00% packet loss
Round-trip min/avg/max = 2/2/2 MS
Now, through the configuration in this case, we believe you are familiar with the GRE over IPv4 of the H3C MSR router. Welcome!
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