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：

  1. 网络中两台独立的路由器做RR，并且属于一个cluster
  2. 两台rr不承担流量转发的工作

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