H3C MSR router GRE over IPv4 typical configuration case

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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