大哥帮忙敲一下命令。还没学到这块儿。

1.6.1  GRE over IPv4隧道典型配置举例

1. 组网需求

Switch A和Switch B分别连接IPv4私有网络Group 1和Group 2。这两个私有网络都使用私网地址，且属于同一个VPN。通过在Switch A和Switch B之间建立GRE隧道，实现两个私有网络的互联。

2. 组网图

图1-7 GRE over IPv4隧道应用组网图

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3. 配置步骤

(1)       配置Switch A

# 创建业务环回组1，并配置服务类型为Tunnel。

<SwitchA> system-view

[SwitchA] service-loopback group 1 type tunnel

# 将接口GigabitEthernet1/0/3加入业务环回组1。

[SwitchA] interface gigabitethernet 1/0/3

[SwitchA-GigabitEthernet1/0/3] port service-loopback group 1

[SwitchA-GigabitEthernet1/0/3] quit

# 创建Tunnel1接口，并指定隧道模式为GRE over IPv4隧道。

[SwitchA] interface tunnel 1 mode gre

# 配置Tunnel1接口的IP地址。

[SwitchA-Tunnel1] ip address 10.1.2.1 255.255.255.0

# 配置Tunnel1接口的源端地址（Switch A的Vlan-interface101的IP地址）。

[SwitchA-Tunnel1] source 1.1.1.1

# 配置Tunnel1接口的目的端地址（Switch B的Vlan-interface101的IP地址）。

[SwitchA-Tunnel1] destination 2.2.2.2

[SwitchA-Tunnel1] quit

# 配置从Switch A经过Tunnel1接口到Group 2的静态路由。

[SwitchA] ip route-static 10.1.3.0 255.255.255.0 tunnel 1

(2)       配置Switch B

# 创建业务环回组1，并配置服务类型为Tunnel。

<SwitchB> system-view

[SwitchB] service-loopback group 1 type tunnel

# 将接口GigabitEthernet1/0/3加入业务环回组1。

[SwitchB] interface gigabitethernet 1/0/3

[SwitchB-GigabitEthernet1/0/3] port service-loopback group 1

[SwitchB-GigabitEthernet1/0/3] quit

# 创建Tunnel1接口，并指定隧道模式为GRE over IPv4隧道。

[SwitchB] interface tunnel 1 mode gre

# 配置Tunnel1接口的IP地址。

[SwitchB-Tunnel1] ip address 10.1.2.2 255.255.255.0

# 配置Tunnel1接口的源端地址（Switch B的Vlan-interface101的IP地址）。

[SwitchB-Tunnel1] source 2.2.2.2

# 配置Tunnel1接口的目的端地址（Switch A的Vlan-interface101的IP地址）。

[SwitchB-Tunnel1] destination 1.1.1.1

[SwitchB-Tunnel1] quit

# 配置从Switch B经过Tunnel1接口到Group 1的静态路由。

[SwitchB] ip route-static 10.1.1.0 255.255.255.0 Tunnel 1

4. 验证配置

# 查看Switch A的Tunnel接口状态。

[SwitchA] display interface tunnel 1

Tunnel1

Current state: UP

Line protocol state: UP

Description: Tunnel1 Interface

Bandwidth: 64kbps

Maximum transmission unit: 1476

Internet address: 10.1.2.1/24 (primary)

Tunnel source 1.1.1.1, destination 2.2.2.2

Tunnel keepalive disabled

Tunnel TTL 255

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 rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

# 查看Switch B的Tunnel接口状态。

[SwitchB] display interface tunnel 1

Tunnel1

Current state: UP

Line protocol state: UP

Description: Tunnel1 Interface

Bandwidth: 64kbps

Maximum transmission unit: 1476

Internet address: 10.1.2.2/24 (primary)

Tunnel source 2.2.2.2, destination 1.1.1.1

Tunnel keepalive disabled

Tunnel TTL 255

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 rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

# 从Switch B可以Ping通Switch A上Vlan-interface100的地址。

[SwitchB] ping -a 10.1.3.1 10.1.1.1

Ping 10.1.1.1 (10.1.1.1) from 10.1.3.1: 56 data bytes, press CTRL_C to break

56 bytes from 10.1.1.1: icmp_seq=0 ttl=255 time=11.000 ms

56 bytes from 10.1.1.1: icmp_seq=1 ttl=255 time=1.000 ms

56 bytes from 10.1.1.1: icmp_seq=2 ttl=255 time=0.000 ms

56 bytes from 10.1.1.1: icmp_seq=3 ttl=255 time=0.000 ms

56 bytes from 10.1.1.1: icmp_seq=4 ttl=255 time=0.000 ms

--- Ping statistics for 10.1.1.1 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 0.000/2.400/11.000/4.317 ms