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根據BGP路由的團體屬性設置BGP路由策略
R1配置：
Loopback0 1.1.1.1
Loopback1 192.168.1.1/24
Loopback2 192.168.2.1/24
Loopback3 192.168.3.1/24
Loopback4 192.168.4.1/24
E1/0 10.1.12.1
R2配置：
Loopback 2.2.2.2
E1/0 10.1.12.2
配置IGP（RIP）保持連通性：
R1配置：
router rip
version 2
network 1.0.0.0
network 10.0.0.0
network 192.168.1.0
network 192.168.2.0
network 192.168.3.0
network 192.168.4.0
no auto-summary
R2配置：
router rip
version 2
network 2.0.0.0
network 10.0.0.0
no auto-summary
開始配置BGP(EBGP)：
R1
router bgp 109
bgp router-id 1.1.1.1
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 10.1.12.0 mask 255.255.255.0
network 192.168.1.0
network 192.168.2.0
network 192.168.3.0
network 192.168.4.0
neighbor 10.1.12.2 remote-as 110
R2
router bgp 110
bgp router-id 2.2.2.2
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 10.1.12.0 mask 255.255.255.0
neighbor 10.1.12.1 remote-as 109
neighbor 10.1.12.1 route-map set_local_pref in
R2#sh ip bgp
BGP table version is 7, local router ID is 2.2.2.2
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 10.1.12.1 1 32768 i
*> 10.1.12.0/24 0.0.0.0 0 32768 i
*> 192.168.1.0 10.1.12.1 0 200 0 109 i
*> 192.168.2.0 10.1.12.1 0 200 0 109 i
*> 192.168.3.0 10.1.12.1 0 150 0 109 i
*> 192.168.4.0 10.1.12.1 0 150 0 109 i
R1配置團體屬性
第一步：開啟路由器支持團體屬性
ip bgp-community new-format
第二步，配置prefix-list列表
ip prefix-list 1 permit 192.168.1.0/24
ip prefix-list 1 permit 192.168.2.0/24
ip prefix-list 2 permit 192.168.3.0/24
ip prefix-list 2 permit 192.168.4.0/24
第三步，配置route-map set_community
route-map set_community permit 10
match ip address prefix-list 1
set community 109:1
route-map set_community permit 20
match ip address prefix-list 2
set community 109:2
第四步，在BGP當中調用
neighbor 10.1.12.2 send-community
neighbor 10.1.12.2 route-map set_community out
R2上配置route-map set_local_pref，對R1傳遞過來的帶有團體屬性的路由進行匹配，并附上特定的local-preference
第一步：開啟路由器支持團體屬性
ip bgp-community new-format
第二步：設置團體屬性列表
ip prefix-list 1 seq 5 permit 192.168.2.0/24
ip prefix-list 1 seq 10 permit 192.168.4.0/24
第三步：
route-map set_local_pref permit 10
match community 1
set local-preference 200
route-map set_local_pref permit 20
match community 2
set local-preference 150
第四步：在BGP當中調用route-map set_local_pref
neighbor 10.1.12.1 route-map set_local_pref in
驗證配置：
R2#sh ip bgp
BGP table version is 7, local router ID is 2.2.2.2
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 10.1.12.1 1 32768 i
*> 10.1.12.0/24 0.0.0.0 0 32768 i
*> 192.168.1.0 10.1.12.1 0 200 0 109 i
*> 192.168.2.0 10.1.12.1 0 200 0 109 i
*> 192.168.3.0 10.1.12.1 0 150 0 109 i
*> 192.168.4.0 10.1.12.1 0 150 0 109 i
R2#sh ip bgp 192.168.1.0
BGP routing table entry for 192.168.1.0/24, version 2
Paths: (1 available, best #1, table default)
Not advertised to any peer
Refresh Epoch 1
109
10.1.12.1 from 10.1.12.1 (1.1.1.1)
Origin IGP, metric 0, localpref 200, valid, external, best
Community: 109:1
rx pathid: 0, tx pathid: 0x0
從R1學來的團體屬性為Community: 109:1的路由設置本地優先級為200.
R2#sh ip bgp 192.168.3.0
BGP routing table entry for 192.168.3.0/24, version 4
Paths: (1 available, best #1, table default)
Not advertised to any peer
Refresh Epoch 1
109
10.1.12.1 from 10.1.12.1 (1.1.1.1)
Origin IGP, metric 0, localpref 150, valid, external, best
Community: 109:2
rx pathid: 0, tx pathid: 0x0
從R1學來的團體屬性為Community: 109:2的路由設置本地優先級為150.
沒有被匹配的路由還是以默認值傳遞。
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