Telegram- 👇 😉
-
. WIKIMERIONET
Merion Mertics , ,

CRM

7

EIGRP. , EIGRP Cisco, . OSPF . , CCNA.

OSPF , EIGRP, , , ABR (Area Border Router) ASBR (Autonomous System Boundary Router). OSPF. , LSA (Link State Advertisement). 11 LSA, . Type 3 LSA Type 5 LSA.

LSA , (backbone area) . Type 3 LSA Summary LSA. LSA ABR . OSPF Summary Net Link States:

   OSPF

LSA , , .

area area-num filter-list prefix prefix-list-name {in | out} OSPF. , prefix-list, . deny .

in out. , area are-num filter. :

  • in, , .
  • out, , , .

:

area 0 filter-list in LSA ( 1 2), area 0. area 2 area 1 , area 2 filter-list in area 1 filter-list out. : area 2 filter-list out 2. .

, , , :

    Cisco Packet Tracer

. in out. ABR1 prefix-list-:

ip prefix-list FILTER-INTO-AREA-34 seq 5 deny 10.16.3.0/24
ip prefix-list FILTER-INTO-AREA-34 seq 10 permit 0.0.0.0/0 le 32
 prefix-list  Cisco

ABR2

ip prefix-list FILTER-OUT-OF-AREA-0 seq 5 deny 10.16.2.0/23 ge 24 le 24
ip prefix-list FILTER-OUT-OF-AREA-0 seq 10 permit 0.0.0.0/0 le 32
 prefix-list  Cisco

R3, , 10.16.3.0 :

, . ABR1 prefix-list deny , 10.16.3.0, 24. . area 34 filter-list prefix FILTER-INTO-AREA-34 in , 34 . OSPF 10.16.3 R1 .

. ip prefix-list FILTER-OUT-OF-AREA-0 seq 5 deny 10.16.2.0/23 ge 24 le 24 , 10.16.2.0 10.16.3.0, /23. , 255.255.254.0, 24. area 0 out LSA 3 , 0. , , .


OSPF distribute-list

LSA . , - 50 , 10 . LSA , , , .

distribute-list. , OSPF .

distribute-list EIGRP, OSPF :

  • distribute-list in | out, in .
  • ACL, prefix-list route-map.
  • interface interface-type-number, .

R3, 10.16.1.0:

    OSPF

, prefix-list-, 10.16.1.0. , show ip ospf database | i 10.16.1.0 , OSPF .


ASBR

, ASBR , . LSA , , OSPF.

:

   ASBR
.

, . ASBR , . , 172.16.101.0/24 172.16.102.0/25 EIGRP. , -, EIGRP.

Cisco IOS route-map. EIGRP.

. , route-map permit, , , ( , route-map deny).

, .

:

ip prefix-list match-area0-permit seq 5 permit 172.16.14.0/30
ip prefix-list match-area0-permit seq 10 permit 172.16.18.0/30
ip prefix-list match-area0-permit seq 15 permit 172.16.8.1/32
ip prefix-list match-area0-permit seq 20 permit 172.16.4.1/32
ip prefix-list match-area0-permit seq 25 permit 172.16.48.0/25
ip prefix-list match-area0-permit seq 30 permit 172.16.49.0/25
ip prefix-list match-area3-permit seq 5 permit 172.16.103.0/24 ge 26 le 26

, LSA Type 5 ASBR . R1 101.0 102.0:

show ip route

ASBR:

   ASBR

R1 :

, 101.0 102.0 .

, , . . !