华为BGP与IGP路由互通（互相引入）配置示例

华为BGP与IGP路由互通（互相引入）配置示例

1、组网需求

图1 BGP与IGP互通组网示例图

如上图1所示，用户将网络划分为AS65008和AS65009，在AS65009内，使用IGP协议来计算路由（该例使用OSPF做为IGP协议）。

要求实现两个AS之间的互相通信。

2、配置思路

2.1、在SwitchB和SwitchC上配置OSPF协议，使SwitchB和SwitchC之间可以互访。

2.2、在SwitchA和SwitchB上配置EBGP连接，使SwitchA和SwitchB之间可以通过BGP相互传递路由。

2.3、在SwitchB上配置BGP与OSPF互相引入，实现两个AS之间的互相通信。

2.4、（可选）在SwitchB上配置BGP路由聚合，简化BGP路由表。

3、配置步骤

3.1、配置各接口所属的VLAN

# 配置SwitchA。

<huawei> system-view/<huawei>

[HUAWEI] sysname SwitchA

[SwitchA] vlan batch 10 30

[SwitchA] interface gigabitethernet 1/0/1

[SwitchA-GigabitEthernet1/0/1] port link-type trunk

[SwitchA-GigabitEthernet1/0/1] port trunk allow-pass vlan 10

[SwitchA-GigabitEthernet1/0/1] quit

[SwitchA] interface gigabitethernet 1/0/2

[SwitchA-GigabitEthernet1/0/2] port link-type trunk

[SwitchA-GigabitEthernet1/0/2] port trunk allow-pass vlan 30

[SwitchA-GigabitEthernet1/0/2] quit

SwitchB和SwitchC的配置同SwitchA（略）

3.2、配置各VLANIF接口的IP地址

# 配置SwitchA。

[SwitchA] interface vlanif 10

[SwitchA-Vlanif10] ip address 10.3.1.2 24

[SwitchA-Vlanif10] quit

[SwitchA] interface vlanif 30

[SwitchA-Vlanif30] ip address 10.8.1.1 24

[SwitchA-Vlanif30] quit

SwitchB和SwitchC的配置同SwitchA（略）

3.3、配置OSPF

# 配置SwitchB。

[SwitchB] ospf 1

[SwitchB-ospf-1] area 0

[SwitchB-ospf-1-area-0.0.0.0] network 10.9.1.0 0.0.0.255

[SwitchB-ospf-1-area-0.0.0.0] quit

[SwitchB-ospf-1] quit

# 配置SwitchC。

[SwitchC] ospf 1

[SwitchC-ospf-1] area 0

[SwitchC-ospf-1-area-0.0.0.0] network 10.9.1.0 0.0.0.255

[SwitchC-ospf-1-area-0.0.0.0] network 10.9.2.0 0.0.0.255

[SwitchC-ospf-1-area-0.0.0.0] quit

[SwitchC-ospf-1] quit

3.4、配置EBGP连接

# 配置SwitchA。

[SwitchA] bgp 65008

[SwitchA-bgp] router-id 10.1.1.1

[SwitchA-bgp] peer 10.3.1.1 as-number 65009

[SwitchA-bgp] ipv4-family unicast

[SwitchA-bgp-af-ipv4] network 10.8.1.0 255.255.255.0

[SwitchA-bgp-af-ipv4] quit

[SwitchA-bgp] quit

# 配置SwitchB。

[SwitchB] bgp 65009

[SwitchB-bgp] router-id 10.2.2.2

[SwitchB-bgp] peer 10.3.1.2 as-number 65008

3.5、配置BGP与IGP互通

# 在SwitchB上配置BGP引入OSPF路由。

[SwitchB-bgp] ipv4-family unicast

[SwitchB-bgp-af-ipv4] import-route ospf 1

[SwitchB-bgp-af-ipv4] quit

[SwitchB-bgp] quit

# 查看SwitchA的路由表。

[SwitchA] display bgp routing-table

BGP Local router ID is 10.1.1.1

Status codes: * - valid, > - best, d - damped,

h - history, i - internal, s - suppressed, S - Stale

Origin : i - IGP, e - EGP, ? - incomplete

Total Number of Routes: 3

Network NextHop MED LocPrf PrefVal Path/Ogn

*> 10.8.1.0/24 0.0.0.0 0 0 i

*> 10.9.1.0/24 10.3.1.1 0 0 65009?

*> 10.9.2.0/24 10.3.1.1 2 0 65009?

# 在SwitchB上配置OSPF引入BGP路由。

[SwitchB] ospf

[SwitchB-ospf-1] import-route bgp

[SwitchB-ospf-1] quit

# 查看SwitchC的路由表。

[SwitchC] display ip routing-table

Route Flags: R - relay, D - download to fib

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

Routing Tables: Public

Destinations : 7 Routes : 7

Destination/Mask Proto Pre Cost Flags NextHop Interface

10.8.1.0/24 O_ASE 150 1 D 10.9.1.1 Vlanif20

10.9.1.0/24 Direct 0 0 D 10.9.1.2 Vlanif20

10.9.1.2/32 Direct 0 0 D 127.0.0.1 Vlanif20

10.9.2.0/24 Direct 0 0 D 10.9.2.1 Vlanif40

10.9.2.1/32 Direct 0 0 D 127.0.0.1 Vlanif40

127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0

127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0

3.6、配置路由自动聚合

# 配置SwitchB。

[SwitchB] bgp 65009

[SwitchB-bgp] ipv4-family unicast

[SwitchB-bgp-af-ipv4] summary automatic

[SwitchB-bgp-af-ipv4] quit

[SwitchB-bgp] quit

# 查看SwitchA的BGP路由表。

[SwitchA] display bgp routing-table

BGP Local router ID is 10.1.1.1

Status codes: * - valid, > - best, d - damped,

h - history, i - internal, s - suppressed, S - Stale

Origin : i - IGP, e - EGP, ? - incomplete

Total Number of Routes: 2

Network NextHop MED LocPrf PrefVal Path/Ogn

*> 10.8.1.0/24 0.0.0.0 0 0 i

*> 10.0.0.0 10.3.1.1 0 65009?

# 使用Ping进行验证。

[SwitchA] ping -a 10.8.1.1 10.9.2.1

PING 10.9.2.1: 56 data bytes, press CTRL_C to break

Reply from 10.9.2.1: bytes=56 Sequence=1 ttl=253 time=15 ms

Reply from 10.9.2.1: bytes=56 Sequence=2 ttl=253 time=31 ms

Reply from 10.9.2.1: bytes=56 Sequence=3 ttl=253 time=47 ms

Reply from 10.9.2.1: bytes=56 Sequence=4 ttl=253 time=46 ms

Reply from 10.9.2.1: bytes=56 Sequence=5 ttl=253 time=47 ms

--- 10.9.2.1 ping statistics ---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max = 15/37/47 ms

4、配置文件

4.1、SwitchA的配置文件

#

sysname SwitchA

#

vlan batch 10 30

#

interface Vlanif10

ip address 10.3.1.2 255.255.255.0

#

interface Vlanif30

ip address 10.8.1.1 255.255.255.0

#

interface GigabitEthernet1/0/1

port link-type trunk

port trunk allow-pass vlan 10

#

interface GigabitEthernet1/0/2

port link-type trunk

port trunk allow-pass vlan 30

#

bgp 65008

router-id 10.1.1.1

peer 10.3.1.1 as-number 65009

#

ipv4-family unicast

undo synchronization

network 10.8.1.0 255.255.255.0

peer 10.3.1.1 enable

#

return

4.2、SwitchB的配置文件

#

sysname SwitchB

#

vlan batch 10 20

#

interface Vlanif10

ip address 10.3.1.1 255.255.255.0

#

interface Vlanif20

ip address 10.9.1.1 255.255.255.0

#

interface GigabitEthernet1/0/1

port link-type trunk

port trunk allow-pass vlan 10

#

interface GigabitEthernet1/0/2

port link-type trunk

port trunk allow-pass vlan 20

#

bgp 65009

router-id 10.2.2.2

peer 10.3.1.2 as-number 65008

#

ipv4-family unicast

undo synchronization

summary automatic

import-route ospf 1

peer 10.3.1.2 enable

#

ospf 1

import-route bgp

area 0.0.0.0

network 10.9.1.0 0.0.0.255

#

return

4.3、SwitchC的配置文件

#

sysname SwitchC

#

vlan batch 20 40

#

interface Vlanif20

ip address 10.9.1.2 255.255.255.0

#

interface Vlanif40

ip address 10.9.2.1 255.255.255.0

#

interface GigabitEthernet1/0/1

port link-type trunk

port trunk allow-pass vlan 20

#

interface GigabitEthernet1/0/2

port link-type trunk

port trunk allow-pass vlan 40

#

ospf 1

area 0.0.0.0

network 10.9.1.0 0.0.0.255

network 10.9.2.0 0.0.0.255

#

return