best-----优先最小的 bgp邻居IP地址(bgp第13条选路规则)

本文介绍了路由器R8的BGP配置详情,包括与邻居201.99.24.2和201.99.25.2的连接及默认路由的下发。此外,还展示了通过BGP学习到的具体路由条目。

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best-----优先最小的 bgp邻居IP地址(bgp第13条选路规则)


TS2-Internet  SP#2 bgp AS 29999  R8 分析


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Internet ISP 2  , R8 只是做了一下ISP服务,同时用来路由接入客户的流量,同时对 R24/R25下发了 BGP 默认路由,同时 对 R70 使用了 DHCP的形式下发了 默认路由。


R8 就相当于一个 Internet 路由器。 



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




R8#show run
R8#show running-config | sec bgp
router bgp 29999
 bgp log-neighbor-changes
 neighbor 201.99.24.2 remote-as 65002
 neighbor 201.99.24.2 
default-originate
 neighbor 201.99.25.2 remote-as 65002
 neighbor 201.99.25.2 default-originate
R8# 
R8#


R8#show ip interface br
R8#show ip interface brief 
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                201.99.24.1     YES NVRAM  up                    up      
Ethernet0/1                201.99.25.1     YES NVRAM  up                    up      
Ethernet0/2                201.99.70.1     YES NVRAM  up                    up      
Ethernet0/3                unassigned      YES NVRAM  administratively down down    
R8# 
R8#


R8#show running-config | sec dhcp 
ip dhcp pool home
 network 201.99.70.0 255.255.255.252
 default-router 201.99.70.1 
R8#
R8#

R70#show running-config interface ethernet 0/0
Building configuration...

Current configuration : 88 bytes
!
interface Ethernet0/0
 ip address dhcp
 ip nat outside
 ip virtual-reassembly in
end

R70#
R70#
R70#

R70#show ip interface brief 
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                201.99.70.2     YES DHCP   up                    up      
Ethernet0/1                192.168.0.1     YES NVRAM  up                    up         
R70# 

R70#  show ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 201.99.70.1 to network 0.0.0.0

S*    0.0.0.0/0 [254/0] via 201.99.70.1
      10.0.0.0/32 is subnetted, 1 subnets
C        10.7.70.70 is directly connected, Loopback0
      192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.0.0/24 is directly connected, Ethernet0/1
L        192.168.0.1/32 is directly connected, Ethernet0/1
      201.99.70.0/24 is variably subnetted, 2 subnets, 2 masks
C        201.99.70.0/30 is directly connected, Ethernet0/0
L        201.99.70.2/32 is directly connected, Ethernet0/0
R70# 
R70#


R24#show ip bgp neighbors 201.99.24.1 routes -----R24/R25 只从ISP --R8 学到了 一个默认路由。
BGP table version is 169, local router ID is 123.45.67.100
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
 *>  0.0.0.0          201.99.24.1                            0 29999 i

Total number of prefixes 1 
R24#
R24#

R25#show ip bgp neighbors 201.99.25.1 routes --R24/R25 只从ISP --R8 学到了 一个默认路由。
BGP table version is 205, local router ID is 123.45.67.100
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
 *>  0.0.0.0          201.99.25.1                            0 29999 i

Total number of prefixes 1 
R25#


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

R8#show ip route  
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      8.0.0.0/32 is subnetted, 1 subnets
B        8.8.8.8 [20/0] via 201.99.24.2, 05:14:12
      10.0.0.0/8 is variably subnetted, 78 subnets, 4 masks
B        10.1.0.0/16 [20/0] via 201.99.24.2, 05:14:12
B        10.1.10.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.10.10/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.11.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.11.11/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.12.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.12.12/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.13.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.13.13/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.14.14/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.15.15/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.20.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.21.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.22.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.23.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.99.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.100.100/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.101.101/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.109.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.110.110/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.111.111/32 [20/0] via 201.99.24.2, 05:14:12
B        10.1.112.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.113.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.114.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.115.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.119.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.200.0/24 [20/0] via 201.99.24.2, 05:14:12
B        10.1.201.0/24 [20/0] via 201.99.24.2, 05:14:12
B        10.1.212.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.213.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.214.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.1.215.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.0.0/16 [20/0] via 201.99.24.2, 05:14:12
B        10.2.10.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.11.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.12.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.13.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.20.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.20.20/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.21.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.21.21/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.22.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.22.22/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.23.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.23.23/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.24.24/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.25.25/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.99.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.109.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.119.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.122.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.123.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.124.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.125.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.200.0/24 [20/0] via 201.99.24.2, 05:14:12
B        10.2.200.200/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.201.0/24 [20/0] via 201.99.24.2, 05:14:12
B        10.2.201.201/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.210.210/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.211.211/32 [20/0] via 201.99.24.2, 05:14:12
B        10.2.222.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.223.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.224.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.2.225.0/30 [20/0] via 201.99.24.2, 05:14:12
B        10.3.0.0/16 [20/0] via 201.99.24.2, 05:14:12
B        10.4.0.0/16 [20/0] via 201.99.24.2, 05:13:41
B        10.5.0.0/16 [20/0] via 201.99.24.2, 05:12:40
B        10.6.1.0/24 [20/0] via 201.99.24.2, 05:13:41
B        10.6.100.0/24 [20/0] via 201.99.24.2, 05:13:41
B        10.6.101.0/24 [20/0] via 201.99.24.2, 05:13:41
B        10.7.0.0/24 [20/0] via 201.99.24.2, 05:12:40
B        10.7.71.71/32 [20/0] via 201.99.24.2, 05:12:40
B        10.100.0.1/32 [20/0] via 201.99.24.2, 05:14:12
B        10.100.0.51/32 [20/0] via 201.99.24.2, 05:13:10
B        10.100.0.60/32 [20/0] via 201.99.24.2, 05:13:41
B        10.200.0.1/32 [20/0] via 201.99.24.2, 05:14:12
B        10.200.0.71/32 [20/0] via 201.99.24.2, 05:12:40
B        10.250.250.250/32 [20/0] via 201.99.24.2, 05:14:12
      100.0.0.0/30 is subnetted, 4 subnets
B        100.10.0.0 [20/0] via 201.99.24.2, 05:13:41
B        100.20.0.0 [20/0] via 201.99.24.2, 05:14:12
B        100.40.0.0 [20/0] via 201.99.24.2, 05:13:10
B        100.50.0.0 [20/0] via 201.99.24.2, 05:13:41
      123.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B        123.45.67.32/28 [20/0] via 201.99.24.2, 05:14:43
B        123.45.67.100/32 [20/10] via 201.99.25.2, 05:14:41
      201.99.24.0/24 is variably subnetted, 2 subnets, 2 masks
C        201.99.24.0/30 is directly connected, Ethernet0/0
L        201.99.24.1/32 is directly connected, Ethernet0/0
      201.99.25.0/24 is variably subnetted, 2 subnets, 2 masks
C        201.99.25.0/30 is directly connected, Ethernet0/1
L        201.99.25.1/32 is directly connected, Ethernet0/1
      201.99.70.0/24 is variably subnetted, 2 subnets, 2 masks
C        201.99.70.0/30 is directly connected, Ethernet0/2
L        201.99.70.1/32 is directly connected, Ethernet0/2
R8# 
R8#
R8#

R8#show ip bgp 
BGP table version is 118, local router ID is 201.99.70.1
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
     0.0.0.0          0.0.0.0                                0 i
 *   8.8.8.8/32       201.99.25.2                            0 65002 65001 19999 i
 *>                   201.99.24.2                            0 65002 65001 19999 i
 *   10.1.0.0/16      201.99.25.2                            0 65002 65001 i
 *>                   201.99.24.2                            0 65002 65001 i
 *   10.1.10.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.10.10/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.11.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *   10.1.11.11/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.12.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.12.12/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.13.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.13.13/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.14.14/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.15.15/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.20.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.21.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.22.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.23.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *   10.1.99.0/30     201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.100.100/32  201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.101.101/32  201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.109.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.110.110/32  201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.111.111/32  201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.112.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.113.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.114.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.115.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.119.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *   10.1.200.0/24    201.99.25.2                            0 65002 65001 i
 *>                   201.99.24.2                            0 65002 65001 i
 *   10.1.201.0/24    201.99.25.2                            0 65002 65001 i
 *>                   201.99.24.2                            0 65002 65001 i
 *   10.1.212.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.213.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.214.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.1.215.0/30    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.2.0.0/16      201.99.25.2                            0 65002 i
 *>                   201.99.24.2                            0 65002 i
 *   10.2.10.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.11.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.12.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.13.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.20.0/30     201.99.25.2                            0 65002 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.20.20/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.21.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.21.21/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.22.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.22.22/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.23.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.23.23/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.24.24/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.25.25/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.99.0/30     201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.109.0/30    201.99.25.2                            0 65002 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.119.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.122.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.123.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.124.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.125.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.200.0/24    201.99.25.2                            0 65002 i
 *>                   201.99.24.2                            0 65002 i
 *   10.2.200.200/32  201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.201.0/24    201.99.25.2                            0 65002 i
 *>                   201.99.24.2                            0 65002 i
 *   10.2.201.201/32  201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.210.210/32  201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.211.211/32  201.99.25.2                            0 65002 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.222.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.223.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.224.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.2.225.0/30    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.3.0.0/16      201.99.25.2                            0 65002 65001 65003 i
 *>                   201.99.24.2                            0 65002 65001 65003 i
 *   10.4.0.0/16      201.99.25.2                            0 65002 10001 65004 i
 *>                   201.99.24.2                            0 65002 10001 65004 i
 *>  10.5.0.0/16      201.99.24.2                            0 65002 10000 65005 i
 *                    201.99.25.2                            0 65002 10000 65005 i
 *   10.6.1.0/24      201.99.25.2                            0 65002 65001 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.6.100.0/24    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.6.101.0/24    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.7.0.0/24      201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.7.71.71/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.100.0.1/32    201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.100.0.51/32   201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.100.0.60/32   201.99.25.2                            0 65002 65001 ?
 *>                   201.99.24.2                            0 65002 65001 ?
 *   10.200.0.1/32    201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.200.0.71/32   201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
 *   10.250.250.250/32
                       201.99.25.2                            0 65002 ?
 *>                   201.99.24.2                            0 65002 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *   100.10.0.0/30    201.99.25.2                            0 65002 10000 ?
 *>                   201.99.24.2                            0 65002 10000 ?
 *   100.20.0.0/30    201.99.25.2                            0 65002 10000 ?
 *>                   201.99.24.2                            0 65002 10000 ?
 *   100.40.0.0/30    201.99.25.2                            0 65002 10000 ?
 *>                   201.99.24.2                            0 65002 10000 ?
 *   100.50.0.0/30    201.99.25.2                            0 65002 10000 ?
 *>                   201.99.24.2                            0 65002 10000 ?
 *>  123.45.67.32/28  201.99.24.2              0             0 65002 i
 *>  123.45.67.100/32 201.99.25.2             10             0 65002 i
 *                    201.99.24.2            100             0 65002 i
R8#    
R8#
R8#


R8#show ip bgp 8.8.8.8/32
BGP routing table entry for 8.8.8.8/32, version 203
Paths: (2 available, best #1, table default)
  Advertised to update-groups:
     1         
  Refresh Epoch 1
  65002 65001 19999
    201.99.24.2 from 201.99.24.2 (123.45.67.100)
      Origin IGP, localpref 100, valid, external, best-----优先最小的 bgp邻居IP地址(bgp第13条选路规则)
      rx pathid: 0, tx pathid: 0x0
  Refresh Epoch 1
  65002 65001 19999
    201.99.25.2 from 201.99.25.2 (123.45.67.100)
      Origin IGP, localpref 100, valid, external
      rx pathid: 0, tx pathid: 0
R8#
R8#





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