华为跨域虚拟专用网络-OptionB方案

水深无声 2022-11-19 11:25 216阅读 0赞

哈喽，大家好！我是[艺博东][Link 1] ，是一个思科出身、专注于华为的网工；好了，话不多说，我们直接进入正题。

### 文章目录 ###

*   *   *  一、拓扑
         *  二、配置与分析
         *  三、跨域 VP\#-OptionB 的特点

由于特殊原因，所以把“N”字母替换为“\#”符号。

如果有看不懂的地方或者想更直观的阅读，建议去我的公众号里查看。公众号：艺博东

### 一、拓扑 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70]

### 二、配置与分析 ###

（1）AS内运行IGP，互通  
（2）把AS的LSP建立起来  
（3）配置AS内的MP-IBGP架构/RR  
（4）ASBR之间的MP-EBGP邻居关系，互联接口启用MPLS  
（5）MPLS VP\#业务接入

**1.底层配置**

AR1

[Huawei]sysname AR1
    [AR1]int g0/0/0
    [AR1-GigabitEthernet0/0/0]ip address 10.1.13.1 24
    [AR1-GigabitEthernet0/0/0]int l0
    [AR1-LoopBack0]ip address 1.1.1.1 32

AR2

[Huawei]sysname AR2
    [AR2]int g0/0/0
    [AR2-GigabitEthernet0/0/0]ip address 10.1.23.2 24
    [AR2-GigabitEthernet0/0/0]int l0
    [AR2-LoopBack0]ip address 2.2.2.2 32

AR3

[Huawei]sysname AR3
    [AR3]int g0/0/0	
    [AR3-GigabitEthernet0/0/0]ip address 10.1.13.3 24
    [AR3-GigabitEthernet0/0/0]int g0/0/1
    [AR3-GigabitEthernet0/0/1]ip address 10.1.23.3 24
    [AR3-GigabitEthernet0/0/1]int g0/0/2	
    [AR3-GigabitEthernet0/0/2]ip address 10.1.34.3 24
    [AR3-GigabitEthernet0/0/2]int l0
    [AR3-LoopBack0]ip address  3.3.3.3 32
    [AR3-LoopBack0]q
    [AR3]rip 
    [AR3-rip-1]v 2
    [AR3-rip-1]network 10.0.0.0
    [AR3-rip-1]network 3.0.0.0

AR4

[Huawei]sysname AR4
    [AR4]int g0/0/0
    [AR4-GigabitEthernet0/0/0]ip address 10.1.34.4 24
    [AR4-GigabitEthernet0/0/0]int g0/0/1
    [AR4-GigabitEthernet0/0/1]ip address 10.1.45.4 24
    [AR4-GigabitEthernet0/0/1]int l0
    [AR4-LoopBack0]ip address 4.4.4.4 32
    [AR4-LoopBack0]q
    [AR4]rip 
    [AR4-rip-1]v 2
    [AR4-rip-1]network 10.0.0.0 
    [AR4-rip-1]network 4.0.0.0

AR5

[Huawei]sysname AR5
    [AR5]int g0/0/0
    [AR5-GigabitEthernet0/0/0]ip address 10.1.45.5 24
    [AR5-GigabitEthernet0/0/0]int g0/0/1
    [AR5-GigabitEthernet0/0/1]ip address 10.1.56.5 24
    [AR5-GigabitEthernet0/0/1]int l0
    [AR5-LoopBack0]ip address 5.5.5.5 32
    [AR5-LoopBack0]q
    [AR5]rip
    [AR5-rip-1]v 2
    [AR5-rip-1]undo summary 
    [AR5-rip-1]network 10.0.0.0
    [AR5-rip-1]network 5.0.0.0
    [AR5-rip-1]q
    [AR5]int g0/0/1
    [AR5-GigabitEthernet0/0/1]undo rip output 
    [AR5-GigabitEthernet0/0/1]undo rip input

AR6、AR7、AR8、AR9、AR10底层配置类似

**2.MPLS**

AR3

[AR3]mpls lsr-id 3.3.3.3
    [AR3]mpls
    [AR3-mpls]mpls ldp
    [AR3-mpls-ldp]int g0/0/2
    [AR3-GigabitEthernet0/0/2]mpls
    [AR3-GigabitEthernet0/0/2]mpls ldp

AR4

[AR4]mpls lsr-id 4.4.4.4
    [AR4]mpls 
    [AR4-mpls]mpls ldp
    [AR4-mpls-ldp]int g0/0/0
    [AR4-GigabitEthernet0/0/0]mpls 
    [AR4-GigabitEthernet0/0/0]mpls ldp
    [AR4-GigabitEthernet0/0/0]int g0/0/1
    [AR4-GigabitEthernet0/0/1]mpls 
    [AR4-GigabitEthernet0/0/1]mpls ldp

AR5

[AR5]mpls lsr-id 5.5.5.5
    [AR5]mpls 
    [AR5-mpls]mpls ldp
    [AR5-mpls-ldp]int g0/0/0
    [AR5-GigabitEthernet0/0/0]mpls 
    [AR5-GigabitEthernet0/0/0]mpls ldp
    [AR5-GigabitEthernet0/0/0]int g0/0/1
    [AR5-GigabitEthernet0/0/1]mpls

\[AR5\]dis mpls lsp  
![在这里插入图片描述][20210117122157213.png]

**3.MP-IBGP**

AR4（ RR）

[AR4]bgp 10
    [AR4-bgp]peer  3.3.3.3 as 10
    [AR4-bgp]peer 3.3.3.3 connect-interface LoopBack  0
    [AR4-bgp]peer 5.5.5.5 as 10
    [AR4-bgp]peer 5.5.5.5 connect-interface LoopBack  0
    [AR4-bgp]ipv4-family vpnv4
    [AR4-bgp-af-vpnv4]peer 3.3.3.3 enable 
    [AR4-bgp-af-vpnv4]peer 3.3.3.3 reflect-client  
    [AR4-bgp-af-vpnv4]peer 5.5.5.5 enable  
    [AR4-bgp-af-vpnv4]peer 5.5.5.5 reflect-client  
    [AR4-bgp-af-vpnv4]undo policy vpn-target

AR5

[AR5]bgp 10
    [AR5-bgp]peer 4.4.4.4 as 10
    [AR5-bgp]peer 4.4.4.4 connect-interface LoopBack 0
    [AR5-bgp]ipv4-family vpnv4
    [AR5-bgp-af-vpnv4]peer 4.4.4.4 enable

\[AR4-rip-1\]dis bgp peer  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 1]

AR6、AR7、AR8、AR9、AR10的MP-IBGP、MPLS配置类似

**4.MP-EBGP**

AR5

[AR5]bgp 10	
    [AR5-bgp]peer 10.1.56.6 as 20
    [AR5-bgp]ipv4-family vpnv4
    [AR5-bgp-af-vpnv4]peer 10.1.56.6 enable 
    [AR5-bgp-af-vpnv4]undo policy vpn-target

AR6

[AR6]bgp 20
    [AR6-bgp]peer 10.1.56.5 as-number 10	
    [AR6-bgp]ipv4-family vpnv4
    [AR6-bgp-af-vpnv4]peer 10.1.56.5 enable 
    [AR6-bgp-af-vpnv4]undo policy vpn-target

\[AR6\]dis bgp peer  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 2]

**5.MPLS VP\#业务接入**

配置号公网，然后是公司B访问公司D；

AR3

[AR3]ip vpn-instance ybd2
    [AR3-vpn-instance-ybd2]route-distinguisher 10:1
    [AR3-vpn-instance-ybd2-af-ipv4]vpn-target 10:1 both 
    [AR3-vpn-instance-ybd2-af-ipv4]int g0/0/1
    [AR3-GigabitEthernet0/0/1]ip binding vpn-instance ybd2
    [AR3-GigabitEthernet0/0/1]ip address 10.1.23.3 24
    [AR3-GigabitEthernet0/0/1]bgp 10	
    [AR3-bgp]peer 10.1.23.2 as 1
    [AR3-bgp]ipv4-family vpn-instance ybd2
    [AR3-bgp-ybd2]peer 10.1.23.2 as 1
    [AR3-bgp-ybd2]peer 10.1.23.2 substitute-as //做AS号的伪装

AR2

[AR2]bgp 1
    [AR2-bgp]peer 10.1.23.3 as 10
    [AR2-bgp]network 2.2.2.2 32

\[AR3-bgp\]dis bgp vp\#v4 all peer  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 3]  
\[AR3\]dis bgp vp\#v4 all routing-table  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 4]  
AR8

[AR8]ip vpn-instance ybd10
    [AR8-vpn-instance-ybd10]route-distinguisher 10:1
    [AR8-vpn-instance-ybd10-af-ipv4]vpn-target 10:1 both 
    [AR8-vpn-instance-ybd10-af-ipv4]int g0/0/2
    [AR8-GigabitEthernet0/0/2]ip binding vpn-instance ybd10
    [AR8-GigabitEthernet0/0/2]ip address 10.1.81.8 24
    [AR8-GigabitEthernet0/0/2]bgp 20
    [AR8-bgp]ipv4-family vpn-instance ybd10
    [AR8-bgp-ybd10]peer 10.1.81.10 as 1
    [AR8-bgp-ybd10]peer 10.1.81.10 substitute-as

AR10\]

[AR10]bgp 1
    [AR10-bgp]peer 10.1.81.8 as 20
    [AR10-bgp]network 10.10.10.10 32

\[AR10\]dis ip routing-table  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 5]

**6.MPLS VP\#业务接入**

公司A访问公司C；

AR3

[AR3]ip vpn-instance ybd1
    [AR3-vpn-instance-ybd1]route-distinguisher 20:1 
    [AR3-vpn-instance-ybd1-af-ipv4]vpn-target 20:1 both 
    [AR3-vpn-instance-ybd1-af-ipv4]int g0/0/0
    [AR3-GigabitEthernet0/0/0]ip binding vpn-instance ybd1
    [AR3-GigabitEthernet0/0/0]ip address 10.1.13.3 24
    [AR3-GigabitEthernet0/0/0]q
    [AR3]ospf 1 vpn-instance ybd1
    [AR3-ospf-1]a 0
    [AR3-ospf-1-area-0.0.0.0]network 10.1.13.3 0.0.0.0
    [AR3-ospf-1-area-0.0.0.0]q
    [AR3-ospf-1]import-route bgp
    [AR3-ospf-1]bgp 10
    [AR3-bgp]ip	
    [AR3-bgp]ipv4-family vpn-instance ybd1
    [AR3-bgp-ybd1]import-route ospf 1

AR1

[AR1]ospf 1 router-id  1.1.1.1
    [AR1-ospf-1]a 0
    [AR1-ospf-1-area-0.0.0.0]network 10.1.13.1 0.0.0.0
    [AR1-ospf-1-area-0.0.0.0]net 1.1.1.1 0.0.0.0

AR8

[AR8]ip vpn-instance ybd9
    [AR8-vpn-instance-ybd9]route-distinguisher 20:1
    [AR8-vpn-instance-ybd9-af-ipv4]vpn-target 20:1 both 
    [AR8-vpn-instance-ybd9-af-ipv4]int g0/0/1
    [AR8-GigabitEthernet0/0/1]ip binding vpn-instance ybd9	
    [AR8-GigabitEthernet0/0/1]ip address 10.1.89.8 24
    [AR8-GigabitEthernet0/0/1]q
    [AR8]isis 1 vpn-instance ybd9
    [AR8-isis-1]import-route bgp
    [AR8-isis-1]network-entity 12.0001.0000.0000.0008.00
    [AR8-isis-1]is-level level-2
    [AR8-isis-1]int g0/0/1
    [AR8-GigabitEthernet0/0/1]isis enable 1
    [AR8-GigabitEthernet0/0/1]bgp 20
    [AR8-bgp]ipv4-family vpn-instance ybd9
    [AR8-bgp-ybd9]import-route  isis 1

AR9

[AR9]isis
    [AR9-isis-1]network-entity 12.0001.0000.0000.0009.00
    [AR9-isis-1]is-level level-2
    [AR9-isis-1]int g0/0/0
    [AR9-GigabitEthernet0/0/0]isis enable 1
    [AR9]int l0
    [AR9-LoopBack0]isis enable

\[AR9\]dis ip routing-table  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 6]  
\[AR1\]ping -a 1.1.1.1 9.9.9.9  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 7]  
公司A 1.1.1.1 访问公司C 9.9.9.9，标签是如何分配的？

封装为：![在这里插入图片描述][20210117142332411.png]

\[AR1\]dis ip routing-table 9.9.9.9  
![在这里插入图片描述][20210117142232711.png]  
查看9.9.9.9路由，下一跳是10.1.13.3；

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 8]  
然后根据AR3的接口下绑定的实例ybd1的路由表，去查相关路由。

\[AR3\]dis ip routing-table vp\#-instance ybd1  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 9]  
下一跳是5.5.5.5

\[AR3\]display bgp vp\#v4 vpn-instance ybd1 routing-table 9.9.9.9  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 10]  
私网标签1031 打上标签封装成：![在这里插入图片描述][20210117143005336.png]

查看公网标签

\[AR3\]display mpls lsp  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 11]  
公网的标签是1025

打上标签封装成：![在这里插入图片描述][20210117143205227.png]  
然后AR3根据G0/0/2接口发送出去

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 12]  
RR 查找标签

\[AR4\]dis mpls lsp

![在这里插入图片描述][20210117145444946.png]

5.5.5.5出标签是3，然后进行弹出顶部标签，从G0/0/1接口发送出去。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 13]  
AR5收到后，查看标签

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 14]

收到的标签是1031的话，出标签是1031，

查看 bgp vp\#v4路由表

\[AR5\]display bgp vp\#v4 all routing-table

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 15]  
下一跳是10.1.56.6

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 16]

\[AR6\]dis mpls lsp  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 17]  
进标签是1031，出标签是1028。

封装为![在这里插入图片描述][20210117144659395.png]  
\[AR6\]dis bgp vp\#v4 all routing-table  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 18]  
下一跳是8.8.8.8

\[AR6\]dis mpls lsp  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 19]  
出标签为1028，封装成：  
![在这里插入图片描述][20210117145014747.png]  
RR 查找标签

\[AR7\]dis mpls lsp

![在这里插入图片描述][20210117145354300.png]

8.8.8.8出标签是3，然后进行弹出顶部标签，从G0/0/1接口发送出去。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 20]

\[AR8\]dis mpls lsp  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 21]  
收到1028的标签去掉，属于ybd6的实例报文

![在这里插入图片描述][20210117150001773.png]

\[AR8\]dis ip routing-table vp\#-instance ybd9  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 22]  
下一跳是10.1.89.9

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 23]

重启进程，抓包查看，有两层标签。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 24]

### 三、跨域 VP\#-OptionB 的特点 ###

公网形成一个架构，后面有公司接入进来的话，只需要在PE设备上配置。

**优点：** 不受ASBR之间互连链路数目的限制；ASBR不需要配置VP\#实例。

**缺点：** VP\#的路由信息是通过AS之间的ASBR来保存和扩散的，当VP\#路由较多时，ASBR负担重，容易成为故障点。因此在MP-EBGP方案中，需要维护VP\#路由信息的ASBR一般不在负责公网转发。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hZRDY5Ng_size_16_color_FFFFFF_t_70 25]

> 名言警句  
> 志不真则心不热，心不热则功不紧。——颜元

--------------------

欢迎访问我的易百纳技术社区文章《华为 跨域VP\#-OptionB方案》  
[https://www.ebaina.com/articles/140000005426][https_www.ebaina.com_articles_140000005426]

--------------------

![在这里插入图片描述][20210117151048593.gif_pic_center]

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[Link 1]: https://ybd99.blog.csdn.net/
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[https_www.ebaina.com_articles_140000005426]: https://www.ebaina.com/articles/140000005426
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