组网需求
如图所示，有7台设备需要组建IBGP网络，其中AR2、AR4和AR5已经建立了BGP全连接。需求在不破坏AR2、AR4和AR5全连接关系的情况下组建IBGP网络，并尽可能的简化设备的配置和管理。
配置思路
采用如下的思路配置BGP路由反射器：
- 配置AR2是Cluster1的路由反射器，AR4和AR5是它的两个客户机，配置禁止客户机间通讯，实现不破坏AR2、AR4和AR5全连接关系的情况下组建IBGP网络的需求。
- 配置AR3为Cluster2的路由反射器，AR6和AR7是它的客户机，实现简化设备的配置和管理的需求。
操作步骤
配置IP
AR1
<Huawei>
<Huawei>sys
[Huawei]sys AR1
[AR1]int g0/0/0
[AR1-GigabitEthernet0/0/0]ip add 12.12.12.1 24
[AR1-GigabitEthernet0/0/0]q
[AR1]int g0/0/1
[AR1-GigabitEthernet0/0/1]ip add 13.13.13.1 24
[AR1-GigabitEthernet0/0/1]q
[AR1]int lo1
[AR1-LoopBack1]ip add 1.1.1.1 24
[AR1-LoopBack1]q
AR2
<Huawei>sys
[Huawei]sys AR2
[AR2]int g0/0/0
[AR2-GigabitEthernet0/0/0]ip add 12.12.12.2 24
[AR2-GigabitEthernet0/0/0]q
[AR2]int g0/0/1
[AR2-GigabitEthernet0/0/1]ip add 24.24.24.2 24
[AR2-GigabitEthernet0/0/1]q
[AR2]int g0/0/2
[AR2-GigabitEthernet0/0/2]ip add 25.25.25.2 24
[AR2-GigabitEthernet0/0/2]q
[AR2]int g2/0/0
[AR2-GigabitEthernet2/0/0]ip add 23.23.23.2 24
[AR2-GigabitEthernet2/0/0]q
AR3
<Huawei>sys
[Huawei]sys AR3
[AR3]int g0/0/0
[AR3-GigabitEthernet0/0/0]ip add 13.13.13.3 24
[AR3-GigabitEthernet0/0/0]q
[AR3]int g0/0/1
[AR3-GigabitEthernet0/0/1]ip add 36.36.36.3 24
[AR3-GigabitEthernet0/0/1]q
[AR3]int g0/0/2
[AR3-GigabitEthernet0/0/2]ip add 37.37.37.3 24
[AR3-GigabitEthernet0/0/2]q
AR4
<Huawei>sys
[Huawei]sys AR4
[AR4]int g0/0/0
[AR4-GigabitEthernet0/0/0]ip add 24.24.24.4 24
[AR4-GigabitEthernet0/0/0]q
[AR4]int g0/0/1
[AR4-GigabitEthernet0/0/1]ip ad 45.45.45.4 24
[AR4-GigabitEthernet0/0/1]q
AR5
<Huawei>sys
[Huawei]sys AR5
[AR5]int g0/0/0
[AR5-GigabitEthernet0/0/0]ip add 25.25.25.5 24
[AR5-GigabitEthernet0/0/0]q
[AR5]int g0/0/1
[AR5-GigabitEthernet0/0/1]ip ad 45.45.45.5 24
[AR5-GigabitEthernet0/0/1]q
AR6
<Huawei>sys
[Huawei]sys AR6
[AR6]int g0/0/0
[AR6-GigabitEthernet0/0/0]ip add 36.36.36.6 24
[AR6-GigabitEthernet0/0/0]q
AR7
<Huawei>sys
[Huawei]sys AR7
[AR7]int g0/0/0
[AR7-GigabitEthernet0/0/0]ip add 37.37.37.7 24
[AR7-GigabitEthernet0/0/0]q
[AR7]
配置BGP
AR1
[AR1]bgp 100
[AR1-bgp]router-id 1.1.1.1
[AR1-bgp]peer 12.12.12.2 as-number 100
[AR1-bgp]peer 13.13.13.3 as-number 100
[AR1-bgp]ipv4-family unicast
[AR1-bgp-af-ipv4]network 1.1.1.0 255.255.255.0
[AR1-bgp-af-ipv4]q
AR2
[AR2]bgp 100
[AR2-bgp]router-id 2.2.2.2
[AR2-bgp]peer 12.12.12.1 as-number 100
[AR2-bgp]peer 23.23.23.3 as-number 100
[AR2-bgp]peer 24.24.24.4 as-number 100
[AR2-bgp]peer 25.25.25.5 as-number 100
AR3
[AR3]bgp 100
[AR3-bgp]router-id 3.3.3.3
[AR3-bgp]peer 13.13.13.1 as-number 100
[AR3-bgp]peer 23.23.23.2 as-number 100
[AR3-bgp]peer 36.36.36.6 as-number 100
[AR3-bgp]peer 37.37.37.7 as-number 100
AR4
[AR4]bgp 100
[AR4-bgp]router-id 4.4.4.4
[AR4-bgp]peer 24.24.24.2 as-number 100
[AR4-bgp]peer 45.45.45.5 as-number 100
AR5
[AR5]bgp 100
[AR5-bgp]router-id 5.5.5.5
[AR5-bgp]peer 25.25.25.2 as-number 100
[AR5-bgp]peer 45.45.45.4 as-number 100
AR6
[AR6]bgp 100
[AR6-bgp]router-id 6.6.6.6
[AR6-bgp]peer 36.36.36.3 as-number 100
AR7
[AR7]bgp 100
[AR7-bgp]router-id 7.7.7.7
[AR7-bgp]peer 37.37.37.3 as-number 100
配置过IBGP的结果
AR1引入了路由1.1.1.0/24，但是AR4、AR5、AR6、AR7、没有关于1.1.1.0/24 BGP路由
配置路由反射器
AR2
#创建对等体组
[AR2-bgp]group 245 internal
# 将对等体加入组中
[AR2-bgp]peer 24.24.24.4 group 245
[AR2-bgp]peer 25.25.25.5 group 245
[AR2-bgp]ipv4-family unicast
# 将本设备作为 路由反射器
[AR2-bgp-af-ipv4]peer 245 reflect-client
# 禁止客户机之间反射路由
[AR2-bgp-af-ipv4]undo reflect between-clients
# 配置路由反射器的集群
[AR2-bgp-af-ipv4]reflector cluster-id 1
[AR2-bgp-af-ipv4]q
[AR2-bgp]q
AR3
#创建对等体组
[AR3-bgp]group 367 internal
# 将对等体加入组中
[AR3-bgp]peer 36.36.36.6 group 367
[AR3-bgp]peer 37.37.37.7 group 367
[AR3-bgp]ipv4-family unicast
# 将本设备作为 路由反射器
[AR3-bgp-af-ipv4]peer 367 reflect-client
# 禁止客户机之间反射路由
[AR3-bgp-af-ipv4]undo reflect between-clients
# 配置路由反射器的集群
[AR3-bgp-af-ipv4]reflector cluster-id 2
[AR3-bgp-af-ipv4]q
[AR3-bgp]q
验证
AR4
<AR4>display bgp routing-table 1.1.1.0
BGP local router ID : 4.4.4.4
Local AS number : 100
Paths: 1 available, 0 best, 0 select
BGP routing table entry information of 1.1.1.0/24:
From: 24.24.24.2 (2.2.2.2)
Route Duration: 00h04m20s
Relay IP Nexthop: 0.0.0.0
Relay IP Out-Interface:
Original nexthop: 12.12.12.1
Qos information : 0x0
AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, internal, pre 255
Originator: 1.1.1.1
Cluster list: 0.0.0.1
Not advertised to any peer yet
<AR4>display bgp routing-table
BGP Local router ID is 4.4.4.4
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 1
Network NextHop MED LocPrf PrefVal Path/Ogn
i 1.1.1.0/24 12.12.12.1 0 100 0 i
AR6
<AR6>display bgp routing-table 1.1.1.0
BGP local router ID : 6.6.6.6
Local AS number : 100
Paths: 1 available, 0 best, 0 select
BGP routing table entry information of 1.1.1.0/24:
From: 36.36.36.3 (3.3.3.3)
Route Duration: 00h00m21s
Relay IP Nexthop: 0.0.0.0
Relay IP Out-Interface:
Original nexthop: 13.13.13.1
Qos information : 0x0
AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, internal, pre 255
Originator: 1.1.1.1
Cluster list: 0.0.0.2
Not advertised to any peer yet
<AR6>display bgp routing-table
BGP Local router ID is 6.6.6.6
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 1
Network NextHop MED LocPrf PrefVal Path/Ogn
i 1.1.1.0/24 13.13.13.1 0 100 0 i