CCNP课程实验-08-BGP-Trouble-Shooting

2024-01-09 21:32:36

实验条件

网络拓朴

在这里插入图片描述

背景环境配置

R1

interface Loopback0
 ip address 1.1.1.2 255.255.255.255 secondary
 ip address 1.1.1.1 255.255.255.255
interface Ethernet0/0
 ip address 12.1.1.1 255.255.255.0
interface Ethernet0/1
 ip address 13.1.1.1 255.255.255.0

ip prefix-list CON seq 5 deny 12.1.1.0/24
ip prefix-list CON seq 10 deny 13.1.1.0/24

route-map RED permit 10
 match ip address prefix-list CON

router bgp 1111
 bgp router-id 1.1.1.1
 redistribute connected route-map RED
 neighbor 12.1.1.2 remote-as 12345
 neighbor 13.1.1.3 remote-as 12345

R2

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 ip ospf 12345 area 0
interface Ethernet0/0
 ip address 12.1.1.2 255.255.255.0
interface Ethernet0/2
 ip address 23.1.1.2 255.255.255.0
 ip ospf 12345 area 0
 ip ospf cost 1000
interface Ethernet0/3
 ip address 25.1.1.2 255.255.255.0
 ip ospf 12345 area 0

router ospf 12345
 router-id 2.2.2.2
router bgp 12345
 bgp router-id 2.2.2.2
 bgp default local-preference 150
 network 2.2.2.2 mask 255.255.255.255
 neighbor 5.5.5.5 remote-as 12345
 neighbor 5.5.5.5 update-source Loopback0
 neighbor 5.5.5.5 route-map LP in
 neighbor 12.1.1.1 remote-as 1111

access-list 1 permit 1.1.1.1
access-list 1 permit 1.1.1.0

route-map LP permit 10
 match ip address 1
 set local-preference 99
route-map LP permit 20

R3

interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 ip ospf 12345 area 0
interface Ethernet0/0
 ip address 34.1.1.3 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/1
 ip address 13.1.1.3 255.255.255.0
interface Ethernet0/2
 ip address 23.1.1.3 255.255.255.0
 ip ospf 12345 area 0
 ip ospf cost 1000

router ospf 12345
 router-id 3.3.3.3
router bgp 12345
 bgp router-id 3.3.3.3
 network 3.3.3.0 mask 255.255.255.0
 neighbor 4.4.4.4 remote-as 12345
 neighbor 4.4.4.4 update-source Loopback0
 neighbor 4.4.4.4 next-hop-self
 neighbor 13.1.1.1 remote-as 1111

R4

interface Loopback0
 ip address 4.4.4.4 255.255.255.255
interface Ethernet0/0
 ip address 34.1.1.4 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/2
 ip address 45.1.1.4 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/3
 ip address 47.1.1.4 255.255.255.0
 ip ospf 12345 area 0

router ospf 12345
 router-id 4.4.4.4
router bgp 12345
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 neighbor 3.3.3.3 remote-as 12345
 neighbor 3.3.3.3 update-source Loopback0
 neighbor 3.3.3.3 route-reflector-client
 neighbor 5.5.5.5 remote-as 12345
 neighbor 5.5.5.5 update-source Loopback0
 neighbor 5.5.5.5 next-hop-self
 neighbor 7.7.7.7 remote-as 12345
 neighbor 7.7.7.7 update-source Loopback0
 neighbor 7.7.7.7 route-reflector-client

R5

interface Loopback0
 ip address 5.5.5.5 255.255.255.255
 ip ospf 12345 area 0
interface Ethernet0/1
 ip address 56.1.1.5 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/2
 ip address 45.1.1.5 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/3
 ip address 25.1.1.5 255.255.255.0
 ip ospf 12345 area 0

router ospf 12345
 router-id 5.5.5.5
router bgp 12345
 bgp router-id 5.5.5.5
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 12345
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 2.2.2.2 route-reflector-client
 neighbor 4.4.4.4 remote-as 12345
 neighbor 4.4.4.4 update-source Loopback0
 neighbor 4.4.4.4 route-reflector-client
 neighbor 6.6.6.6 remote-as 12345
 neighbor 6.6.6.6 shutdown
 neighbor 6.6.6.6 update-source Loopback0
 neighbor 6.6.6.6 route-reflector-client

R6

interface Loopback0
 ip address 6.6.6.6 255.255.255.255
 ip ospf 12345 area 0
interface Ethernet0/0
 ip address 6.7.8.6 255.255.255.0
interface Ethernet0/1
 ip address 56.1.1.6 255.255.255.0
 ip ospf 12345 area 0
interface Ethernet0/2
 ip address 67.1.1.6 255.255.255.0
 ip ospf 12345 area 0

router ospf 12345
 router-id 6.6.6.6
router bgp 12345
 bgp router-id 6.6.6.6
 bgp log-neighbor-changes
 neighbor 5.5.5.5 remote-as 12345
 neighbor 5.5.5.5 update-source Loopback0
 neighbor 5.5.5.5 next-hop-self
 neighbor 6.7.8.8 remote-as 8888
 neighbor 6.7.8.8 route-map MED out
route-map MED permit 10
 match ip address 3
 set metric 100
route-map MED permit 20
 match ip address 2
 set metric 200
route-map MED permit 30

access-list 2 permit 2.2.2.2
access-list 3 permit 3.3.3.3

R7

interface Loopback0
 ip address 7.7.7.7 255.255.255.255
 ip ospf 12345 area 0
interface Ethernet0/1
 ip address 6.7.8.7 255.255.255.0
interface Ethernet0/2
 ip address 67.1.1.7 255.255.255.0
 ip ospf 12345 area 0
 ip ospf cost 1000
interface Ethernet0/3
 ip address 47.1.1.7 255.255.255.0
 ip ospf 12345 area 0

router ospf 12345
 router-id 7.7.7.7
router bgp 12345
 bgp router-id 7.7.7.7
 bgp log-neighbor-changes
 neighbor 4.4.4.4 remote-as 12345
 neighbor 4.4.4.4 password SPOTO
 neighbor 4.4.4.4 update-source Loopback0
 neighbor 4.4.4.4 next-hop-self
 neighbor 6.7.8.8 remote-as 8888
 neighbor 6.7.8.8 route-map MED out
route-map MED permit 10
 match ip address 3
 set metric 200
route-map MED permit 20
 match ip address 2
 set metric 100
route-map MED permit 30

access-list 2 permit 2.2.2.2
access-list 3 permit 3.3.3.3

R8

interface Loopback0
 ip address 8.8.8.8 255.255.255.255
interface Ethernet0/2
 ip address 6.7.8.8 255.255.255.0
 
router bgp 8888
 bgp router-id 8.8.8.8
 bgp log-neighbor-changes
 network 8.8.8.8 mask 255.255.255.255
 neighbor 6.7.8.6 remote-as 12345
 neighbor 6.7.8.7 remote-as 12345

Switch

空,没有配置

1. 确保所有的邻居正常建立

错点1:R4-R7邻居建立报错,BGP认证不通过

配置R4

R4:
	router bgp 12345
	 neighbor 7.7.7.7 password SPOTO

配置完成之后,邻居还是有问题。没有建立。

R4(config-router)#do ping 7.7.7.7 so 4.4.4.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
Packet sent with a source address of 4.4.4.4 
.....
Success rate is 0 percent (0/5)

发现网络有问题。4.4.4.4 没有宣告进OSPF

错点2:4.4.4.4 没有宣告进OSPF

R4interface Loopback0
	 ip ospf 12345 area 0

R4-R7之间邻居建立.

错点3:R5-R6邻居被关闭,重新启用

R5:
	router bgp 12345
	 no neighbor 6.6.6.6 shutdown

错点4:交换机接口没开

R5interface range ethernet 0/0-2
	 no shutdown

检查所有邻居状态,都正常建立邻居

2. 路由选择

去往3.3.3.3路径调整

R8#traceroute 3.3.3.3 so lo0 
Type escape sequence to abort.
Tracing the route to 3.3.3.3
VRF info: (vrf in name/id, vrf out name/id)
  1  *  *  * 
  2  *  *  * 

网络不通,检查环回口是否配置,是否宣告进BGP等
经查,有配置环回口,宣告进BGP时,宣告路由不正确

错点5:3.3.3.3没有正确宣告进BGP

R3:
	router bgp 12345
	 no network 3.3.3.0 mask 255.255.255.0
	 network 3.3.3.3 mask 255.255.255.255

宣告进BGP的路由条目,必须和路由表保持一致。
再次测试成功

R8#traceroute 3.3.3.3 so lo0
Type escape sequence to abort.
Tracing the route to 3.3.3.3
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec 0 msec 0 msec
  2 56.1.1.5 0 msec 0 msec 1 msec
  3 45.1.1.4 0 msec 1 msec 0 msec
  4 34.1.1.3 1 msec *  1 msec
R8#

去往2.2.2.2路径调整

R8#traceroute 2.2.2.2 so lo0
Type escape sequence to abort.
Tracing the route to 2.2.2.2
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.7 0 msec 1 msec 0 msec
  2 47.1.1.4 0 msec 0 msec 0 msec
  3 45.1.1.5 0 msec 0 msec 0 msec
  4 25.1.1.2 1 msec *  1 msec
R8#

与目标一致无须调整。

去往1.1.1.1/1.1.1.2路径调整

两个环回口的ip地址没有被宣告进BGP,经过检查发现,是在直连路由重分布进BGP的时候,被过滤了

错点6:R1重分布时,过滤路由时配置错误

R1

R1#show ip prefix-list
ip prefix-list CON: 2 entries
   seq 5 deny 12.1.1.0/24
   seq 10 deny 13.1.1.0/24

没有permit其它ip地址

R1:
	ip prefix-list CON permit 0.0.0.0/0 le 32

结果查询:

R1(config)#do show ip prefix-list                   
ip prefix-list CON: 3 entries
   seq 5 deny 12.1.1.0/24
   seq 10 deny 13.1.1.0/24
   seq 15 permit 0.0.0.0/0 le 32
R1(config)#do show ip bgp
BGP table version is 6, 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, 
              t secondary path, 
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 ?
 *>   1.1.1.2/32       0.0.0.0                  0         32768 ?
 *    2.2.2.2/32       13.1.1.3                               0 12345 i
 *>                    12.1.1.2                 0             0 12345 i
 *    3.3.3.3/32       12.1.1.2                               0 12345 i
 *>                    13.1.1.3                 0             0 12345 i
 *    8.8.8.8/32       12.1.1.2                               0 12345 8888 i
 *>                    13.1.1.3                               0 12345 8888 i
R1(config)#

错误7:12,13网段被过滤,R2,R3的IBGP邻居要配置下一跳的IP地址为自己

IGP的路由很可能没有直达12,13网段的路由,所以如果指定下一跳的IP是12,13网段很可能会让网络不通,因为最好是转发路由通告的时候,把下一跳的IP指向自己。
查询BGP配置,发现R3已经配置好了,R2没有配置

R2:
	router bgp 12345
	 neighbor 5.5.5.5 next-hop-self

错点8:R8没有开启BGP多路负载均衡

R8#traceroute 1.1.1.1 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.7 1 msec 0 msec
  2 47.1.1.4 1 msec 0 msec
  3 34.1.1.3 1 msec 0 msec
  4 13.1.1.1 2 msec * 

与目标不一致。因为没有开启多路负载均衡。

R8:
	router bgp 8888
	 maximum-paths 2

检查路径:

R8#traceroute 1.1.1.1 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 0 msec
    6.7.8.7 1 msec
  2 56.1.1.5 0 msec
    47.1.1.4 1 msec
  3 25.1.1.2 1 msec
    45.1.1.5 0 msec
  4 12.1.1.1 1 msec
    25.1.1.2 1 msec
R8#traceroute 1.1.1.2 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.2
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec
    6.7.8.7 1 msec
  2 56.1.1.5 0 msec
    47.1.1.4 1 msec
  3 25.1.1.2 1 msec
    45.1.1.5 0 msec
  4 12.1.1.1 1 msec
    25.1.1.2 0 msec
R8#

查结果发现多路负载均衡时,两个目标网络都是走以下的路径(配合拓扑图分析得出):
R8->R6->R5->R2->R1
R8->R7->R4->R5->R2
从要求上看,去往1.1.1.2的路由符合要求,达到目标,而去往1.1.1.1的第3跳应该是R3或是R4,但在R4上进行路由时,下一跳变成R5,分析R4路由器上的BGP路由表

R4(config-if)#do show ip bgp
......
     Network          Next Hop            Metric LocPrf Weight Path
 *>i  1.1.1.1/32       2.2.2.2                  0    150      0 1111 ?
 *>i  1.1.1.2/32       2.2.2.2                  0    150      0 1111 ?
 r>i  2.2.2.2/32       2.2.2.2                  0    150      0 i
 r>i  3.3.3.3/32       3.3.3.3                  0    100      0 i
 * i  8.8.8.8/32       6.6.6.6                  0    100      0 8888 i
 *>i                   7.7.7.7                  0    100      0 8888 i
R4(config-if)#do show ip route 
......
      1.0.0.0/32 is subnetted, 2 subnets
B        1.1.1.1 [200/0] via 2.2.2.2, 00:08:11
B        1.1.1.2 [200/0] via 2.2.2.2, 00:08:11
      2.0.0.0/32 is subnetted, 1 subnets
O        2.2.2.2 [110/21] via 45.1.1.5, 03:38:43, Ethernet0/2
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/11] via 34.1.1.3, 03:38:43, Ethernet0/0
R4(config-if)#
......

可以看出,R4上的并没有收到R3通告过来关于1.1.1.1的路由信息,查询R3的路由表信息

R3(config-router)#do show ip bgp
......
     Network          Next Hop            Metric LocPrf Weight Path
 *>i  1.1.1.1/32       2.2.2.2                  0    150      0 1111 ?
 *                     13.1.1.1                 0             0 1111 ?
 *>i  1.1.1.2/32       2.2.2.2                  0    150      0 1111 ?
 *                     13.1.1.1                 0             0 1111 ?
 r>i  2.2.2.2/32       2.2.2.2                  0    150      0 i
 *>   3.3.3.3/32       0.0.0.0                  0         32768 i
 *>i  8.8.8.8/32       7.7.7.7                  0    100      0 8888 i

R3(config-router)#do show ip bgp 1.1.1.1/32
BGP routing table entry for 1.1.1.1/32, version 11
Paths: (2 available, best #1, table default)
  Advertised to update-groups:
     1         
  Refresh Epoch 2
  1111
    2.2.2.2 (metric 31) from 4.4.4.4 (4.4.4.4)
      Origin incomplete, metric 0, localpref 150, valid, internal, best
      Originator: 2.2.2.2, Cluster list: 4.4.4.4, 5.5.5.5
      rx pathid: 0, tx pathid: 0x0
  Refresh Epoch 1
  1111
    13.1.1.1 from 13.1.1.1 (1.1.1.1)
      Origin incomplete, metric 0, localpref 100, valid, external
      rx pathid: 0, tx pathid: 0
R3(config-router)#

在R3上可以看到R2和R1通告过来的关于1.1.1.1路由信息。由于R2的local-preference被调整过。所以下一跳为2.2.2.2的路由变成了最优(该路由经过了4.4.4.4和5.5.5.5两个反射器反射到了R3且还是最优,则由R1通告过来的路由就被忽略了不传递给反射器),为了不影响其它的路由选路,最好用Prefix-list或是access-list来修改指定1.1.1.1路由的local-preference值。让从R3到R1的路径变成最优。可以在R2向IBGP的OUT方向,调小1.1.1.1的local-preference,让从R2走的路由优先级变小。从而达到从R3走的目的,也可以调大R3向IBGP的OUT方向,调大1.1.1.1的local-preference,让从R3走的路由优先级变大,从而达到从R3走的目的。

错点9:route-map 应用方向错误

查询R2的配置:

R2:
	access-list 1 permit 1.1.1.1
	access-list 1 permit 1.1.1.0
	
	route-map LP permit 10
	 match ip address 1
	 set local-preference 99
	route-map LP permit 20
	
	router bgp 12345
	 neighbor 5.5.5.5 route-map LP in

从配置上看,目的是为了调小1.1.1.1的路由local-preference值,降低优先级。达到不从R2走的目的,但是由于1.1.1.1的路由通告方向是从R1->R2->R5(到R5反射器),而以上的配置则表示是从R5方向接受1.1.1.1路由的时候设置local-preference值为150,显然与实际路由通告的方向不符导致配置失效,现进行以下修改:

R2:
	router bgp 12345
	 no neighbor 5.5.5.5 route-map LP in
	 neighbor 5.5.5.5 route-map LP out

查询R2,R5的BGP路由表(查询之前记得先清理 do clear ip bgp * soft)

R2(config-router)#do show ip bgp  
......
     Network          Next Hop            Metric LocPrf Weight Path
 * i  1.1.1.1/32       3.3.3.3                  0    100      0 1111 ?
 *>                    12.1.1.1                 0             0 1111 ?
 *>   1.1.1.2/32       12.1.1.1                 0             0 1111 ?
 *>   2.2.2.2/32       0.0.0.0                  0         32768 i
 r>i  3.3.3.3/32       3.3.3.3                  0    100      0 i
 *>i  8.8.8.8/32       6.6.6.6                  0    100      0 8888 i

R2(config-router)#do show ip bgp 1.1.1.1/32
BGP routing table entry for 1.1.1.1/32, version 6
Paths: (2 available, best #2, table default)
  Advertised to update-groups:
     6         
  Refresh Epoch 19
  1111
    3.3.3.3 (metric 31) from 5.5.5.5 (5.5.5.5)
      Origin incomplete, metric 0, localpref 100, valid, internal
      Originator: 3.3.3.3, Cluster list: 5.5.5.5, 4.4.4.4
      rx pathid: 0, tx pathid: 0
  Refresh Epoch 2
  1111
    12.1.1.1 from 12.1.1.1 (1.1.1.1)
      Origin incomplete, metric 0, localpref 150, valid, external, best
      rx pathid: 0, tx pathid: 0x0

现在由于降低了R2的1.1.1.1的local-preference值,可以收到R3反射来的路由了。最优路径还是从直连12.1.1.1走,这是合理的

R5(config-router)#do show ip bgp       
......
     Network          Next Hop            Metric LocPrf Weight Path
 *>i  1.1.1.1/32       3.3.3.3                  0    100      0 1111 ?
 * i                   2.2.2.2                  0     99      0 1111 ?
 *>i  1.1.1.2/32       2.2.2.2                  0    150      0 1111 ?
 r>i  2.2.2.2/32       2.2.2.2                  0    150      0 i
 r>i  3.3.3.3/32       3.3.3.3                  0    100      0 i
 *>i  8.8.8.8/32       6.6.6.6                  0    100      0 8888 i
 * i                   7.7.7.7                  0    100      0 8888 i
R5(config-router)#do show ip route
......
      1.0.0.0/32 is subnetted, 2 subnets
B        1.1.1.1 [200/0] via 3.3.3.3, 00:01:19
B        1.1.1.2 [200/0] via 2.2.2.2, 00:48:33
      2.0.0.0/32 is subnetted, 1 subnets
O        2.2.2.2 [110/11] via 25.1.1.2, 04:19:05, Ethernet0/3
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/21] via 45.1.1.4, 04:19:05, Ethernet0/2
......

现在R5去往1.1.1.1往3.3.3.3的机器走了,3.3.3.3则是走R4的路由,因此目的达成,且去往1.1.1.2的路由不受影响。测试路由如下:

R8#traceroute 1.1.1.1 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec
    6.7.8.7 0 msec
  2 67.1.1.7 0 msec
    47.1.1.4 1 msec
  3 47.1.1.4 1 msec
    34.1.1.3 0 msec
  4 34.1.1.3 1 msec
    13.1.1.1 1 msec
R8#traceroute 1.1.1.2 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.2
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec
    6.7.8.7 0 msec
  2 56.1.1.5 1 msec
    47.1.1.4 0 msec
  3 25.1.1.2 1 msec
    45.1.1.5 0 msec
  4 12.1.1.1 0 msec
    25.1.1.2 1 msec
R8#

另外一种方法达到目的

在R3上修改方法

R3:
	access-list 1 permit 1.1.1.1
	
	route-map R3-LP permit 10
	 match ip address 1
	 set local-preference 151
	route-map R3-LP permit 20

	router bgp 12345
	 neighbor 13.1.1.1 route-map R3-LP in

查询R3,R5的BGP路由表(查询之前记得先清理 do clear ip bgp * soft)

R3:
     Network          Next Hop            Metric LocPrf Weight Path
 *>   1.1.1.1/32       13.1.1.1                 0    151      0 1111 ?
 *    1.1.1.2/32       13.1.1.1                 0             0 1111 ?
 *>i                   2.2.2.2                  0    150      0 1111 ?
 r>i  2.2.2.2/32       2.2.2.2                  0    150      0 i
 *>   3.3.3.3/32       0.0.0.0                  0         32768 i
 *>i  8.8.8.8/32       7.7.7.7                  0    100      0 8888 i

R5Network          Next Hop            Metric LocPrf Weight Path
 *>i  1.1.1.1/32       3.3.3.3                  0    151      0 1111 ?
 * i                   2.2.2.2                  0    150      0 1111 ?
 *>i  1.1.1.2/32       2.2.2.2                  0    150      0 1111 ?
 r>i  2.2.2.2/32       2.2.2.2                  0    150      0 i
 r>i  3.3.3.3/32       3.3.3.3                  0    100      0 i
 *>i  8.8.8.8/32       6.6.6.6                  0    100      0 8888 i
 * i                   7.7.7.7                  0    100      0 8888 i

测试路由

R8#traceroute 1.1.1.1 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec
    6.7.8.7 0 msec
  2 67.1.1.7 0 msec
    47.1.1.4 1 msec
  3 47.1.1.4 1 msec
    34.1.1.3 0 msec
  4 34.1.1.3 1 msec
    13.1.1.1 1 msec
R8#traceroute 1.1.1.2 so lo 0 probe 2
Type escape sequence to abort.
Tracing the route to 1.1.1.2
VRF info: (vrf in name/id, vrf out name/id)
  1 6.7.8.6 1 msec
    6.7.8.7 0 msec
  2 56.1.1.5 1 msec
    47.1.1.4 0 msec
  3 25.1.1.2 1 msec
    45.1.1.5 0 msec
  4 12.1.1.1 0 msec
    25.1.1.2 1 msec
R8#

与要求一致目标达成了。

文章来源:https://blog.csdn.net/Linux7985/article/details/135417043
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