在IBGP邻居中，使用反射器减少IBGP邻居关系是一种最常用的网络结构，在上图中AS65001中有6台路由器，其中，R1和R2是一组反射器，配置如下：
R1：
!
interface Loopback0
ip address 10.255.255.1 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.6.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet2
ip address 10.10.4.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.7.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
router isis 10
net 49.0000.1025.5255.1000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.1
bgp cluster-id 10.255.255.1
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
bgp scan-time 15
neighbor as65001 peer-group
neighbor as65001 password cisco
neighbor as65001 update-source Loopback0
neighbor as65001 route-reflector-client
neighbor as65001 next-hop-self
neighbor 10.255.255.2 remote-as 65001
neighbor 10.255.255.2 peer-group as65001
neighbor 10.255.255.3 remote-as 65001
neighbor 10.255.255.3 peer-group as65001
neighbor 10.255.255.4 remote-as 65001
neighbor 10.255.255.4 peer-group as65001
neighbor 10.255.255.5 remote-as 65001
neighbor 10.255.255.5 peer-group as65001
neighbor 10.255.255.6 remote-as 65001
neighbor 10.255.255.6 peer-group as65001
!
R2：
!
interface Loopback0
ip address 10.255.255.2 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.6.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet2
ip address 10.10.5.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.8.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
router isis 10
net 49.0000.1025.5255.2000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.2
bgp cluster-id 10.255.255.1
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
bgp scan-time 15
neighbor as65001 peer-group
neighbor as65001 password cisco
neighbor as65001 update-source Loopback0
neighbor as65001 route-reflector-client
neighbor as65001 next-hop-self
neighbor 10.255.255.1 remote-as 65001
neighbor 10.255.255.1 peer-group as65001
neighbor 10.255.255.3 remote-as 65001
neighbor 10.255.255.3 peer-group as65001
neighbor 10.255.255.4 remote-as 65001
neighbor 10.255.255.4 peer-group as65001
neighbor 10.255.255.5 remote-as 65001
neighbor 10.255.255.5 peer-group as65001
neighbor 10.255.255.6 remote-as 65001
neighbor 10.255.255.6 peer-group as65001
!
R3：
!
interface Loopback0
ip address 10.255.255.3 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.3.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet2
ip address 10.10.4.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.1.1 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router isis 10
net 49.0000.1025.5255.3000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.3
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
bgp scan-time 15
neighbor 10.10.1.2 remote-as 65002
neighbor 10.10.1.2 password cisco
neighbor 10.10.1.2 fall-over bfd
neighbor 10.255.255.1 remote-as 65001
neighbor 10.255.255.1 password cisco
neighbor 10.255.255.1 update-source Loopback0
neighbor 10.255.255.1 next-hop-self
neighbor 10.255.255.2 remote-as 65001
neighbor 10.255.255.2 password cisco
neighbor 10.255.255.2 update-source Loopback0
neighbor 10.255.255.2 next-hop-self
!
R4：
!
interface Loopback0
ip address 10.255.255.4 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.3.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet2
ip address 10.10.5.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.2.1 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router isis 10
net 49.0000.1025.5255.4000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.4
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp scan-time 15
neighbor 10.10.2.2 remote-as 65002
neighbor 10.10.2.2 password cisco
neighbor 10.10.2.2 fall-over bfd
neighbor 10.255.255.1 remote-as 65001
neighbor 10.255.255.1 password cisco
neighbor 10.255.255.1 update-source Loopback0
neighbor 10.255.255.1 next-hop-self
neighbor 10.255.255.2 remote-as 65001
neighbor 10.255.255.2 password cisco
neighbor 10.255.255.2 update-source Loopback0
neighbor 10.255.255.2 next-hop-self
!
R5：
!
interface Loopback0
ip address 10.255.255.5 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.9.1 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.7.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
router isis 10
net 49.0000.1025.5255.5000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.5
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp scan-time 15
network 10.255.255.5 mask 255.255.255.255
neighbor 10.255.255.1 remote-as 65001
neighbor 10.255.255.1 password cisco
neighbor 10.255.255.1 update-source Loopback0
neighbor 10.255.255.1 next-hop-self
neighbor 10.255.255.2 remote-as 65001
neighbor 10.255.255.2 password cisco
neighbor 10.255.255.2 update-source Loopback0
neighbor 10.255.255.2 next-hop-self
!
R6：
interface Loopback0
ip address 10.255.255.6 255.255.255.255
ip router isis 10
!
interface GigabitEthernet1
ip address 10.10.9.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
interface GigabitEthernet3
ip address 10.10.8.2 255.255.255.252
ip router isis 10
negotiation auto
isis network point-to-point
isis password cisco
!
router isis 10
net 49.0000.1025.5255.6000.00
is-type level-2-only
!
router bgp 65001
bgp router-id 10.255.255.6
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp scan-time 15
network 10.255.255.6 mask 255.255.255.255
neighbor 10.255.255.1 remote-as 65001
neighbor 10.255.255.1 password cisco
neighbor 10.255.255.1 update-source Loopback0
neighbor 10.255.255.1 next-hop-self
neighbor 10.255.255.2 remote-as 65001
neighbor 10.255.255.2 password cisco
neighbor 10.255.255.2 update-source Loopback0
neighbor 10.255.255.2 next-hop-self
!
R7：
interface Loopback0
ip address 10.255.255.7 255.255.255.255
!
interface GigabitEthernet1
ip address 10.10.1.2 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet2
ip address 10.10.2.2 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router bgp 65002
bgp router-id 10.255.255.7
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
bgp scan-time 15
network 10.255.255.7 mask 255.255.255.255
neighbor 10.10.1.1 remote-as 65001
neighbor 10.10.1.1 password cisco
neighbor 10.10.1.1 fall-over bfd
neighbor 10.10.2.1 remote-as 65001
neighbor 10.10.2.1 password cisco
neighbor 10.10.2.1 fall-over bfd
!
在RR1上查看BGP邻居建立情况，如下图：
在RR2上查看BGP邻居建立情况，如下图：
规划设计要点：
- 网络中两台独立的路由器做RR，并且属于一个cluster
- 两台rr不承担流量转发的工作