利用BGPorigin-code属性修改BGP选路-创新互联

实验拓扑

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利用BGP origin-code 属性修改BGP选路

基本配置：

L0:1.1.1.1/32

L1:11.1.1.1/32

E1/0:10.1.12.1/24

E1/1:10.1.14.1/24

L0:2.2.2.2/32

L1:22.2.2.2/32

E1/0:10.1.12.2/24

E1/1:10.1.24.2/24

L0:4.4.4.4/32

L1:44.4.4.4/32

E1/0:10.1.24.4/24

E1/1:10.1.14.4/24

配置IGP（RIP）：

router rip

version 2

network 1.0.0.0

network 10.0.0.0

no auto-summary

router rip

version 2

network 2.0.0.0

network 10.0.0.0

no auto-summary

router rip

version 2

network 4.0.0.0

network 10.0.0.0

no auto-summary

配置BGP：

router bgp 1

bgp router-id 1.1.1.1

bgp log-neighbor-changes

network 1.1.1.1 mask 255.255.255.255

network 2.2.2.2 mask 255.255.255.255 backdoor

network 4.4.4.4 mask 255.255.255.255 backdoor

network 11.1.1.1 mask 255.255.255.255

neighbor 2.2.2.2 remote-as 23

neighbor 2.2.2.2 ebgp-multihop 2

neighbor 2.2.2.2 update-source Loopback0

neighbor 4.4.4.4 remote-as 23

neighbor 4.4.4.4 ebgp-multihop 2

neighbor 4.4.4.4 update-source Loopback0

router bgp 23

bgp router-id 2.2.2.2

bgp log-neighbor-changes

network 1.1.1.1 mask 255.255.255.255 backdoor

network 2.2.2.2 mask 255.255.255.255

network 22.2.2.2 mask 255.255.255.255

neighbor 1.1.1.1 remote-as 1

neighbor 1.1.1.1 ebgp-multihop 2

neighbor 1.1.1.1 update-source Loopback0

neighbor 4.4.4.4 remote-as 23

neighbor 4.4.4.4 update-source Loopback0

router bgp 23

bgp router-id 4.4.4.4

bgp log-neighbor-changes

network 1.1.1.1 mask 255.255.255.255 backdoor

network 4.4.4.4 mask 255.255.255.255

network 44.4.4.4 mask 255.255.255.255

neighbor 1.1.1.1 remote-as 1

neighbor 1.1.1.1 ebgp-multihop 2

neighbor 1.1.1.1 update-source Loopback0

neighbor 2.2.2.2 remote-as 23

neighbor 2.2.2.2 update-source Loopback0

查看R1路由表:origin 为i，表示从IGP 学来的路由。

R1#sh ip bgp

BGP table version is 5, local router ID is 1.1.1.1

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

r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

x best-external, a additional-path, c RIB-compressed,

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

RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path

r 2.2.2.2/32 4.4.4.4 0 23 i

r> 2.2.2.2 0 0 23 i

r 4.4.4.4/32 4.4.4.4 0 0 23 i

r> 2.2.2.2 0 23 i

* 22.2.2.2/32 4.4.4.4 0 23 i

*> 2.2.2.2 0 0 23 i

* 44.4.4.4/32 4.4.4.4 0 0 23 i

*> 2.2.2.2 0 23 i

查看22.2.2.2 44.4.4.4的路由表：

R1#sh ip bgp 22.2.2.2

BGP routing table entry for 22.2.2.2/32, version 4

Paths: (2 available, best #2, table default)

Advertised to update-groups:

Refresh Epoch 1

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, localpref 100, valid, external

rx pathid: 0, tx pathid: 0

Refresh Epoch 1

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, metric 0, localpref 100, valid, external, best

rx pathid: 0, tx pathid: 0x0

R1#sh ip bgp 44.4.4.4

BGP routing table entry for 44.4.4.4/32, version 5

Paths: (2 available, best #2, table default)

Advertised to update-groups:

Refresh Epoch 1

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, metric 0, localpref 100, valid, external

rx pathid: 0, tx pathid: 0

Refresh Epoch 1

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, localpref 100, valid, external, best

rx pathid: 0, tx pathid: 0x0

origin皆为IGP。修改 bgp origin-clde 属性，使R1到R2的22.2.2.2 永久的从R4走，到R4的44.4.4.4永久的从R2走。

在R1上配置：

第一步：配置prefix-list

ip prefix-list 22 seq 5 permit 22.2.2.2/32

ip prefix-list 44 seq 5 permit 44.4.4.4/32

第二步：配置route-map

route-map ori-r2 permit 10

match ip address prefix-list 22

set origin incomplete

route-map ori-r2 permit 20

route-map ori-r4 permit 10

match ip address prefix-list 44

set origin incomplete

route-map ori-r4 permit 20

第三步：在BGP中，对相应的邻居in方向调用route-map。

neighbor 2.2.2.2 route-map ori-r2 in

neighbor 4.4.4.4 route-map ori-r4 in

第四步：重置BGP邻居，重新学习路由

clea ip bgp *

查看R1 BGP路由表：

R1#sh ip bgp

BGP table version is 16, local router ID is 1.1.1.1

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

r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

x best-external, a additional-path, c RIB-compressed,

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

RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path

*> 1.1.1.1/32 0.0.0.0 0 32768 i

r 2.2.2.2/32 4.4.4.4 0 23 i

r> 2.2.2.2 0 0 23 i

r 4.4.4.4/32 4.4.4.4 0 0 23 i

r> 2.2.2.2 0 23 i

*> 11.1.1.1/32 0.0.0.0 0 32768 i

*> 22.2.2.2/32 4.4.4.4 0 23 i

* 2.2.2.2 0 0 23 ?

* 44.4.4.4/32 4.4.4.4 0 0 23 ?

*> 2.2.2.2 0 23 i

此是，BGP表显示从R2学来的22.2.2.2路由，origin-code属性已改为？（incomplete），从R4学来的44.4.4.4路由，属性也改为？（incomplete），优先选择origin-clde为i的路由。

IGP(i)优于EGP(e)优于incomplete(?)的路由。

R1#sh ip bgp 22.2.2.2

BGP routing table entry for 22.2.2.2/32, version 16

Paths: (2 available, best #1, table default)

Advertised to update-groups:

Refresh Epoch 1

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin IGP, localpref 100, valid, external, best

rx pathid: 0, tx pathid: 0x0

Refresh Epoch 1

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin incomplete, metric 0, localpref 100, valid, external

rx pathid: 0, tx pathid: 0

R1#sh ip bgp 44.4.4.4

BGP routing table entry for 44.4.4.4/32, version 15

Paths: (2 available, best #2, table default)

Advertised to update-groups:

Refresh Epoch 1

4.4.4.4 (metric 1) from 4.4.4.4 (4.4.4.4)

Origin incomplete, metric 0, localpref 100, valid, external

rx pathid: 0, tx pathid: 0

Refresh Epoch 1

2.2.2.2 (metric 1) from 2.2.2.2 (2.2.2.2)

Origin IGP, localpref 100, valid, external, best

rx pathid: 0, tx pathid: 0x0

实验完成。

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