BGP详解3

九、配置样例2

下面的示例中涉及到聚合路由内容,并将聚合路由使用communityrouter-mapprefix-list等功能实现过滤精细路由,拓扑图如下所示。

clip_image024[4]

具体配置如下:

R1#sh running-config

!

hostname R1

!

interface Loopback0

ip address 192.168.192.1 255.255.255.0

!

interface Loopback1

ip address 192.168.193.1 255.255.255.0

!

interface Loopback2

ip address 192.168.194.1 255.255.255.0

!

interface Loopback3

ip address 192.168.195.1 255.255.255.0

!

interface Loopback4

ip address 192.168.196.1 255.255.255.0

!

interface Loopback5

ip address 192.168.197.1 255.255.255.0

!

interface Loopback6

ip address 192.168.198.1 255.255.255.0

!

interface Loopback7

ip address 192.168.199.1 255.255.255.0

!

interface Ethernet1/0

ip address 10.1.1.1 255.255.255.0

duplex half

!

interface Ethernet1/1

ip address 10.1.6.1 255.255.255.0

duplex half

!

router ospf 10

log-adjacency-changes

network 10.1.1.0 0.0.0.255 area 0

network 10.1.6.0 0.0.0.255 area 0

network 192.168.192.0 0.0.0.255 area 0

network 192.168.193.0 0.0.0.255 area 0

network 192.168.194.0 0.0.0.255 area 0

network 192.168.195.0 0.0.0.255 area 0

network 192.168.196.0 0.0.0.255 area 0

network 192.168.197.0 0.0.0.255 area 0

network 192.168.198.0 0.0.0.255 area 0

network 192.168.199.0 0.0.0.255 area 0

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

R2#sh running-config

interface Ethernet1/0

ip address 10.1.1.2 255.255.255.0

duplex half

!

interface Serial2/0

ip address 10.1.2.1 255.255.255.0

serial restart-delay 0

!

router ospf 10

log-adjacency-changes

network 10.1.1.0 0.0.0.255 area 0

!

router bgp 100

no synchronization

bgp log-neighbor-changes

aggregate-address 192.168.192.0 255.255.248.0

redistribute ospf 10 metric 50

neighbor 10.1.2.2 remote-as 200

neighbor 10.1.2.2 send-community

neighbor 10.1.2.2 route-map community out

neighbor 10.1.6.2 remote-as 100

no auto-summary

!

access-list 110 permit ip host 192.168.192.0 host 255.255.248.0

!

route-map community permit 10

match ip address 110

set community none

!

route-map community permit 20

set community no-export

!

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

R3#sh running-config

interface Ethernet1/0

ip address 10.1.7.1 255.255.255.0

duplex half

!

interface Serial2/0

ip address 10.1.2.2 255.255.255.0

serial restart-delay 0

!

interface Serial2/1

ip address 10.1.3.1 255.255.255.0

serial restart-delay 0

!

router bgp 200

no synchronization

bgp log-neighbor-changes

neighbor 10.1.2.1 remote-as 100

neighbor 10.1.3.2 remote-as 300

neighbor 10.1.7.2 remote-as 200

no auto-summary

!

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

R4#sh running-config

interface Serial2/0

ip address 10.1.3.2 255.255.255.0

serial restart-delay 0

!

interface Serial2/1

ip address 10.1.4.1 255.255.255.0

serial restart-delay 0

!

router bgp 300

no synchronization

bgp log-neighbor-changes

neighbor 10.1.3.1 remote-as 200

neighbor 10.1.4.2 remote-as 200

no auto-summary

!

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

R5#sh running-config

interface Ethernet1/0

ip address 10.1.7.2 255.255.255.0

duplex half

!

interface Serial2/0

ip address 10.1.4.2 255.255.255.0

serial restart-delay 0

!

interface Serial2/1

ip address 10.1.5.1 255.255.255.0

serial restart-delay 0

!

router bgp 200

no synchronization

bgp log-neighbor-changes

neighbor 10.1.4.1 remote-as 300

neighbor 10.1.5.2 remote-as 100

neighbor 10.1.7.1 remote-as 200

no auto-summary

!

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

R6#sh running-config

interface Ethernet1/0

ip address 10.1.6.2 255.255.255.0

duplex half

!

interface Serial2/0

ip address 10.1.5.2 255.255.255.0

serial restart-delay 0

!

!

router ospf 10

log-adjacency-changes

network 10.1.6.0 0.0.0.255 area 0

!

router bgp 100

no synchronization

bgp log-neighbor-changes

aggregate-address 192.168.192.0 255.255.248.0

redistribute ospf 10 metric 50

neighbor 10.1.1.2 remote-as 100

neighbor 10.1.5.1 remote-as 200

neighbor 10.1.5.1 send-community

neighbor 10.1.5.1 route-map community out

no auto-summary

!

!

ip prefix-list aggregate seq 5 permit 192.168.192.0/21

!

route-map community permit 10

match ip address prefix-list aggregate

set community none

!

route-map community permit 20

set community no-export

!

配置完成以后,可以查看聚合路由表。

R4#sh ip bgp

BGP table version is 32, local router ID is 10.1.4.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

* 192.168.192.0/21 10.1.4.2 0 200 100 i

*> 10.1.3.1 0 200 100 i

R3#sh ip bgp

BGP table version is 22, local router ID is 10.1.7.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

* i10.1.1.0/24 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 0 0 100 *

* i10.1.6.0/24 10.1.5.2 0 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.192.0/21 10.1.5.2 0 100 0 100 i

*> 10.1.2.1 0 0 100 i

* i192.168.192.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.193.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.194.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.195.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.196.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.197.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.198.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.199.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

R5#sh ip bgp

BGP table version is 33, local router ID is 10.1.7.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

* i10.1.1.0/24 10.1.2.1 0 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i10.1.6.0/24 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 0 0 100 *

*> 192.168.192.0/21 10.1.5.2 0 0 100 i

* i 10.1.2.1 0 100 0 100 i

* i192.168.192.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.193.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.194.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.195.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.196.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.197.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.198.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

* i192.168.199.1/32 10.1.2.1 50 100 0 100 *

*> 10.1.5.2 50 0 100 *

使用下面的命令查看携带NO-EPORT COMMUNITY属性的路由情况

R3#sh ip bgp community no-export

BGP table version is 22, local router ID is 10.1.7.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 10.1.1.0/24 10.1.2.1 0 0 100 *

*> 10.1.6.0/24 10.1.2.1 50 0 100 *

*> 192.168.192.1/32 10.1.2.1 50 0 100 *

*> 192.168.193.1/32 10.1.2.1 50 0 100 *

*> 192.168.194.1/32 10.1.2.1 50 0 100 *

*> 192.168.195.1/32 10.1.2.1 50 0 100 *

*> 192.168.196.1/32 10.1.2.1 50 0 100 *

*> 192.168.197.1/32 10.1.2.1 50 0 100 *

*> 192.168.198.1/32 10.1.2.1 50 0 100 *

*> 192.168.199.1/32 10.1.2.1 50 0 100 *

R5#sh ip bgp community no-export

BGP table version is 33, local router ID is 10.1.7.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 10.1.1.0/24 10.1.5.2 50 0 100 *

*> 10.1.6.0/24 10.1.5.2 0 0 100 *

*> 192.168.192.1/32 10.1.5.2 50 0 100 *

*> 192.168.193.1/32 10.1.5.2 50 0 100 *

*> 192.168.194.1/32 10.1.5.2 50 0 100 *

*> 192.168.195.1/32 10.1.5.2 50 0 100 *

*> 192.168.196.1/32 10.1.5.2 50 0 100 *

*> 192.168.197.1/32 10.1.5.2 50 0 100 *

*> 192.168.198.1/32 10.1.5.2 50 0 100 *

*> 192.168.199.1/32 10.1.5.2 50 0 100 *

也可以在上面配置的基础上实现如下策略:

* 通过R2-R3链路来宣告192.168.192.0/24、192.168.193.0/24、192.168.194.0/24

* 通过R6-R5链路来宣告192.168.196.0/24、192.168.197.0/24、192.168.198.0/24

* 不宣告192.168.195.0/24、192.168.199.0/24

具体配置如下:

R2#sh running-config

router bgp 100

no synchronization

bgp log-neighbor-changes

aggregate-address 192.168.192.0 255.255.248.0 suppress-map suppress

!

access-list 1 permit 192.168.195.0 0.0.0.255

access-list 1 permit 192.168.196.0 0.0.3.255

!

route-map suppress permit 10

match ip address 1

R6#sh running-config

router bgp 100

no synchronization

bgp log-neighbor-changes

aggregate-address 192.168.192.0 255.255.248.0 suppress-map suppress

!

ip prefix-list suppress seq 5 permit 192.168.192.0/22 le 24

ip prefix-list suppress seq 10 permit 192.168.199.0/24

!

route-map suppress permit 10

match ip address prefix-list suppress

使用命令查看路由状态

R3#sh ip bgp

BGP table version is 39, local router ID is 10.1.7.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

* i10.1.1.0/24 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 0 0 100 *

* i10.1.6.0/24 10.1.5.2 0 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.192.0/21 10.1.5.2 0 100 0 100 i

*> 10.1.2.1 0 0 100 i

* i192.168.192.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.193.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.194.1/32 10.1.5.2 50 100 0 100 *

*> 10.1.2.1 50 0 100 *

* i192.168.195.1/32 10.1.5.2 50 100 0 100 *

* i192.168.196.1/32 10.1.5.2 50 100 0 100 *

* i192.168.197.1/32 10.1.5.2 50 100 0 100 *

* i192.168.198.1/32 10.1.5.2 50 100 0 100 *

* i192.168.199.1/32 10.1.5.2 50 100 0 100 *

R5#sh ip bgp

BGP table version is 62, local router ID is 10.1.7.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, * - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 10.1.1.0/24 10.1.5.2 50 0 100 *

* i 10.1.2.1 0 100 0 100 *

*> 10.1.6.0/24 10.1.5.2 0 0 100 *

* i 10.1.2.1 50 100 0 100 *

*> 192.168.192.0/21 10.1.5.2 0 0 100 i

* i 10.1.2.1 0 100 0 100 i

*> 192.168.192.1/32 10.1.5.2 50 0 100 *

* i 10.1.2.1 50 100 0 100 *

*> 192.168.193.1/32 10.1.5.2 50 0 100 *

* i 10.1.2.1 50 100 0 100 *

*> 192.168.194.1/32 10.1.5.2 50 0 100 *

* i 10.1.2.1 50 100 0 100 *

*> 192.168.195.1/32 10.1.5.2 50 0 100 *

*> 192.168.196.1/32 10.1.5.2 50 0 100 *

*> 192.168.197.1/32 10.1.5.2 50 0 100 *

*> 192.168.198.1/32 10.1.5.2 50 0 100 *

*> 192.168.199.1/32 10.1.5.2 50 0 100 *


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