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1. OSPF external type 1 이 type 2 보다 우선함.



[R2]--------[R4]

  |           /  |     

  |        /     |    

  |     /        |  

  |  /           | 

[R1]--------[R3]   




R1 설정

 - static 10.10.10.0/24 를 ospf로 재분배 및 ospf type 1 설정


chano@vMX_01# show policy-options | display set 

set policy-options policy-statement static_to_ospf term 10 from protocol static

set policy-options policy-statement static_to_ospf term 10 then external type 1

set policy-options policy-statement static_to_ospf term 10 then accept

set policy-options policy-statement static_to_ospf term 20 then reject


chano@vMX_01# show routing-options | display set   

set routing-options static route 10.10.10.0/24 discard

set routing-options router-id 172.27.255.1


chano@vMX_01# show protocols ospf| display set 
set protocols ospf export static_to_ospf
set protocols ospf area 0.0.0.0 interface ae1.0 interface-type p2p
set protocols ospf area 0.0.0.0 interface ge-0/0/6.0 interface-type p2p
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set protocols ospf area 0.0.0.1 interface ge-0/0/3.0 interface-type p2p

R3 설정
  - static 10.10.10.0/24 를 ospf로 재분배 및 ospf type 2 설정

chano@vMX_03# show policy-options | display set 
set policy-options policy-statement static_to_ospf term 10 from protocol static
set policy-options policy-statement static_to_ospf term 10 then external type 2
set policy-options policy-statement static_to_ospf term 10 then accept
set policy-options policy-statement static_to_ospf term 20 then reject

chano@vMX_03# show routing-options | display set 
set routing-options static route 10.10.10.0/24 discard
set routing-options router-id 172.27.255.3

chano@vMX_03# show protocols ospf| display set 
set protocols ospf export static_to_ospf
set protocols ospf area 0.0.0.0 interface ge-0/0/1.0 interface-type p2p
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set protocols ospf area 0.0.0.0 interface ge-0/0/2.0 interface-type p2p
set protocols ospf area 0.0.0.2 interface ge-0/0/3.0 interface-type p2p

R4에서 10.10.10.0/24 대역 확인
 -  external type 1을 우선함을 확인.

chano@vMX_04> show route 10.10.10.0/24 

inet.0: 25 destinations, 25 routes (25 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.10.10.0/24      *[OSPF/150] 00:25:01, metric 1, tag 0
                    > to 172.27.0.10 via ae1.0  [R1향 인터페이스 ae1]

chano@vMX_04> show ospf database extensive external 
    OSPF AS SCOPE link state database
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len 
Extern   10.10.10.0       172.27.255.1     0x80000021   136  0x22 0xe249  36
  mask 255.255.255.0
  Topology default (ID 0)
    Type: 1, Metric: 0, Fwd addr: 0.0.0.0, Tag: 0.0.0.0
  Aging timer 00:57:43
  Installed 00:02:15 ago, expires in 00:57:44, sent 00:02:15 ago
  Last changed 00:02:15 ago, Change count: 7
Extern   10.10.10.0       172.27.255.3     0x80000001    80  0x22 0x9a2f  36
  mask 255.255.255.0
  Topology default (ID 0)
    Type: 2, Metric: 0, Fwd addr: 0.0.0.0, Tag: 0.0.0.0
  Aging timer 00:58:40
  Installed 00:01:19 ago, expires in 00:58:40, sent 00:01:19 ago
  Last changed 00:01:19 ago, Change count: 1






2. external type 1 는 경로에 있는 모든 링크 cost 값을 더함.


   external type 2 는 경로에 있는 모든 링크 cost 값을 무시함.

    


[R2]--------[R4]---------[R5]

  |      

  |   

  |     

  | 

[R1]                       


  - 모든 링크 cost는 1로 설정함.


R1 설정

  - R1 에서 10.10.10.0/24 대역을 ospf type 1 으로 광고


chano@vMX_01# show policy-options | display set 

set policy-options policy-statement static_to_ospf term 10 from protocol static

set policy-options policy-statement static_to_ospf term 10 then external type 1

set policy-options policy-statement static_to_ospf term 10 then accept

set policy-options policy-statement static_to_ospf term 20 then reject


chano@vMX_01# show protocols ospf | display set 

set protocols ospf export static_to_ospf

set protocols ospf area 0.0.0.0 interface ae1.0 interface-type p2p

set protocols ospf area 0.0.0.0 interface ge-0/0/6.0 interface-type p2p

set protocols ospf area 0.0.0.0 interface lo0.0 passive

set protocols ospf area 0.0.0.1 interface ge-0/0/3.0 interface-type p2p


chano@vMX_01# show routing-options | display set 
set routing-options static route 10.10.10.0/24 discard
set routing-options router-id 172.27.255.1


R5 에서 확인


chano@vMX_05> show route 10.10.10.0/24 extensive    


inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)

10.10.10.0/24 (1 entry, 1 announced)

TSI:

KRT in-kernel 10.10.10.0/24 ->

        *OSPF   Preference: 150

                Next hop type: Router, Next hop index: 561

                Address: 0x9700438

                Next-hop reference count: 13

                Next hop: 172.27.0.21 via ae2.0, selected

                Session Id: 0x142

                State: <Active Int Ext>

                Age: 2:21       Metric: 3   ( R1<---> R5경로의 cost를 더한 값(1+1+1)이 출력. )

                Validation State: unverified 

                        Tag: 0 

                Task: OSPF

                Announcement bits (1): 0-KRT 

                AS path: I




R1 설정

 - R1 에서 10.10.10.0/24 대역을 ospf type 2 으로 광고


chano@vMX_01# show policy-options | display set 

set policy-options policy-statement static_to_ospf term 10 from protocol static

set policy-options policy-statement static_to_ospf term 10 then external type 2

set policy-options policy-statement static_to_ospf term 10 then accept

set policy-options policy-statement static_to_ospf term 20 then reject


R5 에서 확인

chano@vMX_05> show route 10.10.10.0/24 extensive    

inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)
10.10.10.0/24 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.10.10.0/24 ->
        *OSPF   Preference: 150
                Next hop type: Router, Next hop index: 561
                Address: 0x9700438
                Next-hop reference count: 13
                Next hop: 172.27.0.21 via ae2.0, selected
                Session Id: 0x142
                State: <Active Int Ext>
                Age: 30         Metric: 0  ( R1 <--> R5 경로상의 cost 값 무시, metric 미설정으로 0이 출력됨.)
                Validation State: unverified 
                        Tag: 0 
                Task: OSPF
                Announcement bits (1): 0-KRT 
                AS path: I



R1 설정 

 - R1 에서 10.10.10.0/24 대역을 ospf type 2 으로 광고 (metric 100 설정)


chano@vMX_01# show policy-options | display set 

set policy-options policy-statement static_to_ospf term 10 from protocol static

set policy-options policy-statement static_to_ospf term 10 then metric 100

set policy-options policy-statement static_to_ospf term 10 then external type 2

set policy-options policy-statement static_to_ospf term 10 then accept

set policy-options policy-statement static_to_ospf term 20 then reject



R5 에서 확인


chano@vMX_05> show route 10.10.10.0/24 extensive    


inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)

10.10.10.0/24 (1 entry, 1 announced)

TSI:

KRT in-kernel 10.10.10.0/24 ->

        *OSPF   Preference: 150

                Next hop type: Router, Next hop index: 561

                Address: 0x9700438

                Next-hop reference count: 13

                Next hop: 172.27.0.21 via ae2.0, selected

                Session Id: 0x142

                State: <Active Int Ext>

                Age: 3  Metric: 100   ( R1 <--> R5 경로상의 cost 값 무시하고 설정한 cost 값 100 출력됨.)

                Validation State: unverified 

                        Tag: 0 

                Task: OSPF

                Announcement bits (1): 0-KRT 

                AS path: I










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