bgp第三次

AR1

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AR2
system - view
interface GigabitEthernet0/0/0
 ip address 2.2.2.2 32
quit
interface GigabitEthernet0/0/1
 ip address 192.168.20.1 24
quit
interface LoopBack0
 ip address 2.2.2.100 32
quit
bgp 123
 router - id 2.2.2.2
 peer 1.1.1.100 as - number 123
 peer 1.1.1.100 connect - interface LoopBack0
 peer 192.168.1.2 as - number 400
 ipv4 - family unicast
  undo synchronization
  peer 192.168.1.2 route - policy pre_val_10 permit export
  network 2.2.2.2 32
  network 192.168.20.0 24
quit
ip ip - prefix pre_val_10 index 10 permit 192.168.10.0 24
route - policy pre_val_10 permit node 10
 if - match ip - address prefix - list pre_val_10
 apply preference - value 200
route - policy pre_val_10 deny node 20

AR3
system - view
interface GigabitEthernet0/0/0
 ip address 3.3.3.3 32
quit
interface GigabitEthernet0/0/1
 ip address 192.168.30.1 24
quit
interface LoopBack0
 ip address 3.3.3.100 32
quit
bgp 123
 router - id 3.3.3.3
 peer 1.1.1.100 as - number 123
 peer 1.1.1.100 connect - interface LoopBack0
 peer 192.168.1.2 as - number 400
 ipv4 - family unicast
  undo synchronization
  peer 192.168.1.2 route - policy as_path_11 permit export
  peer 192.168.1.2 route - policy med_12 permit export
  network 3.3.3.3 32
  network 192.168.30.0 24
quit
ip ip - prefix as_path_11 index 10 permit 192.168.11.0 24
route - policy as_path_11 permit node 10
 if - match ip - address prefix - list as_path_11
 apply as - path 123 additive
route - policy as_path_11 deny node 20
ip ip - prefix med_12 index 10 permit 192.168.12.0 24
route - policy med_12 permit node 10
 if - match ip - address prefix - list med_12
 apply cost 100
route - policy med_12 deny node 20

AR4
system - view
interface GigabitEthernet0/0/0
 ip address 192.168.1.1 24
quit
interface GigabitEthernet0/0/1
 ip address 192.168.2.1 24
quit
bgp 400
 router - id 192.168.1.1
 peer 2.2.2.2 as - number 123
 peer 3.3.3.3 as - number 123
 ipv4 - family unicast
  undo synchronization
  network 192.168.1.0 24
  network 192.168.2.0 24
  network 192.168.3.0 24
quit

 AR5
system - view
interface GigabitEthernet0/0/0
 ip address 192.168.10.2 24
quit
bgp 500
 router - id 192.168.10.2
 peer 192.168.10.1 as - number 123
 ipv4 - family unicast
  undo synchronization
  peer 192.168.10.1 route - policy as_filter deny import
  peer 192.168.10.1 route - policy community_3 deny import
  peer 192.168.10.1 route - policy community_3 permit export
  network 192.168.10.0 24
  network 192.168.11.0 24
  network 192.168.12.0 24
quit
route - policy as_filter deny node 10
 if - match as - path 123
route - policy as_filter permit node 20
ip ip - prefix community_3 index 10 permit 192.168.3.0 24
route - policy community_3 deny node 10
 if - match ip - address prefix - list community_3
route - policy community_3 permit node 20

运行结果

<AR1>display bgp peer
 BGP local router ID : 1.1.1.1
 Local AS number : 123
 Total number of peers : 3                 Peers in established state : 3
  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv
  192.168.10.2    4         500     100      98     0 00:10:00 Established       3
  2.2.2.100       4         123     200     202     0 00:15:00 Established       5
  3.3.3.100       4         123     180     185     0 00:12:00 Established       4

 

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