BGP路由的手动汇总

网络拓扑

XRV1

==========================================================

!
hostname XRV1
!
interface Loopback0
ip address 220.198.32.1 255.255.255.255
ip router isis 100
!
interface GigabitEthernet1
ip address 123.103.15.1 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet2
ip address 123.103.15.5 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet3
ip address 10.10.1.2 255.255.255.252
ip router isis 100
negotiation auto
isis circuit-type level-2-only
!
router isis 100
net 49.0000.2201.9832.1000.00
is-type level-2-only
!
router bgp 4809
bgp router-id 220.198.32.1
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
aggregate-address 43.180.0.0 255.255.0.0 as-set
aggregate-address 36.159.0.0 255.255.0.0 as-set
aggregate-address 27.160.0.0 255.255.0.0 as-set
aggregate-address 14.102.0.0 255.255.0.0 as-set
neighbor 123.103.15.2 remote-as 9308
neighbor 123.103.15.2 password cisco
neighbor 123.103.15.2 fall-over bfd
neighbor 123.103.15.6 remote-as 9808
neighbor 123.103.15.6 password cisco
neighbor 123.103.15.6 fall-over bfd
neighbor 220.198.32.5 remote-as 4809
neighbor 220.198.32.5 password cisco
neighbor 220.198.32.5 update-source Loopback0
neighbor 220.198.32.5 next-hop-self
!

XRV2

==========================================================

!
hostname XRV2
!
interface Loopback0
ip address 220.198.32.2 255.255.255.255
!
interface GigabitEthernet1
ip address 123.103.15.2 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet2
ip address 123.103.15.13 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet3
ip address 123.103.15.9 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router bgp 9308
bgp router-id 220.198.32.2
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
aggregate-address 43.180.0.0 255.255.0.0 summary-only
aggregate-address 36.159.0.0 255.255.0.0 summary-only
aggregate-address 27.160.0.0 255.255.0.0 summary-only
aggregate-address 14.102.0.0 255.255.0.0 summary-only
neighbor 123.103.15.1 remote-as 4809
neighbor 123.103.15.1 password cisco
neighbor 123.103.15.1 fall-over bfd
neighbor 123.103.15.10 remote-as 9808
neighbor 123.103.15.10 password cisco
neighbor 123.103.15.10 fall-over bfd
neighbor 123.103.15.14 remote-as 4807
neighbor 123.103.15.14 password cisco
neighbor 123.103.15.14 fall-over bfd
!

XRV3

==========================================================

!
hostname XRV3
interface Loopback0
ip address 220.198.32.3 255.255.255.255
!
interface GigabitEthernet2
ip address 123.103.15.14 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet4
ip address 123.103.15.17 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router bgp 4807
bgp router-id 220.198.32.3
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
neighbor 123.103.15.13 remote-as 9308
neighbor 123.103.15.13 password cisco
neighbor 123.103.15.13 fall-over bfd
neighbor 123.103.15.18 remote-as 9808
neighbor 123.103.15.18 password cisco
neighbor 123.103.15.18 fall-over bfd
!

XRV4

==========================================================

!
hostname XRV4
!
interface Loopback0
ip address 220.198.32.4 255.255.255.255
!
interface GigabitEthernet2
ip address 123.103.15.6 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet3
ip address 123.103.15.10 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
interface GigabitEthernet4
ip address 123.103.15.18 255.255.255.252
negotiation auto
bfd interval 250 min_rx 250 multiplier 3
!
router bgp 9808
bgp router-id 220.198.32.4
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
aggregate-address 43.180.0.0 255.255.0.0 suppress-map external-export
aggregate-address 27.160.0.0 255.255.0.0 suppress-map external-export
aggregate-address 14.102.0.0 255.255.0.0 suppress-map external-export
neighbor 123.103.15.5 remote-as 4809
neighbor 123.103.15.5 password cisco
neighbor 123.103.15.5 fall-over bfd
neighbor 123.103.15.9 remote-as 9308
neighbor 123.103.15.9 password cisco
neighbor 123.103.15.9 fall-over bfd
neighbor 123.103.15.17 remote-as 4807
neighbor 123.103.15.17 password cisco
neighbor 123.103.15.17 fall-over bfd
!
ip prefix-list external-export seq 5 permit 14.102.0.0/16
ip prefix-list external-export seq 10 permit 27.160.0.0/16
ip prefix-list external-export seq 15 permit 43.180.0.0/16
!
route-map external-export permit 10
match ip address prefix-list external-export
!

XRV5

==========================================================

!
hostname XRV5
!
interface Loopback0
ip address 220.198.32.5 255.255.255.255
ip router isis 100
!
interface GigabitEthernet0/0
switchport access vlan 100
switchport mode access
media-type rj45
negotiation auto
!
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
media-type rj45
negotiation auto
!
interface GigabitEthernet0/2
media-type rj45
negotiation auto
!
interface GigabitEthernet0/3
media-type rj45
negotiation auto
!
interface Vlan1
ip address 14.102.1.254 255.255.255.0
!
interface Vlan2
ip address 14.102.128.254 255.255.255.0
!
interface Vlan3
ip address 14.102.192.254 255.255.255.0
!
interface Vlan4
ip address 14.102.255.254 255.255.255.0
!
interface Vlan5
ip address 27.160.1.254 255.255.255.0
!
interface Vlan6
ip address 27.160.128.254 255.255.255.0
!
interface Vlan7
ip address 27.160.192.254 255.255.255.0
!
interface Vlan8
ip address 27.160.255.254 255.255.255.0
!
interface Vlan9
ip address 36.159.1.254 255.255.255.0
!
interface Vlan10
ip address 36.159.128.254 255.255.255.0
!
interface Vlan11
ip address 36.159.192.254 255.255.255.0
!
interface Vlan12
ip address 36.159.255.254 255.255.255.0
!
interface Vlan13
ip address 43.180.1.254 255.255.255.0
!
interface Vlan14
ip address 43.180.128.254 255.255.255.0
!
interface Vlan15
ip address 43.180.192.254 255.255.255.0
!
interface Vlan16
ip address 43.180.255.254 255.255.255.0
!
interface Vlan100
ip address 10.10.1.1 255.255.255.252
ip router isis 100
isis circuit-type level-2-only
!
router isis 100
net 49.0000.2201.9832.5000.00
is-type level-2-only
!
router bgp 4809
bgp router-id 220.198.32.5
bgp log-neighbor-changes
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
bgp graceful-restart
network 14.102.1.0 mask 255.255.255.0
network 14.102.128.0 mask 255.255.255.0
network 14.102.192.0 mask 255.255.255.0
network 14.102.255.0 mask 255.255.255.0
network 27.160.1.0 mask 255.255.255.0
network 27.160.128.0 mask 255.255.255.0
network 27.160.192.0 mask 255.255.255.0
network 27.160.255.0 mask 255.255.255.0
network 36.159.1.0 mask 255.255.255.0
network 36.159.128.0 mask 255.255.255.0
network 36.159.192.0 mask 255.255.255.0
network 36.159.255.0 mask 255.255.255.0
network 43.180.1.0 mask 255.255.255.0
network 43.180.128.0 mask 255.255.255.0
network 43.180.192.0 mask 255.255.255.0
network 43.180.255.0 mask 255.255.255.0
neighbor 220.198.32.1 remote-as 4809
neighbor 220.198.32.1 password cisco
neighbor 220.198.32.1 update-source Loopback0
!

手工汇总的注意事项：

1.as-set 当BGP的路由汇总后，原路由的属性会丢失，比如as-path等，加as-set属性能够重新生成新的as-path

2. advertise-map 只对 advertise-map 匹配的路由条目进行路由聚合

3. attribute-map 聚合后清除原路由的属性

4.suppress-map 设置为bgp路由条目为suppress，即该条目在BGP路由表中带s