IS-IS L2 Routes Leak into L1 Area

假設網路架構為R1-R2，R1與R2之間形成L1 adjacency，在兩個routers之間只看到L1 PDU，有兩種方式可以達成目的：

1.Extended-ACL

R1(config)#access-list 100 permit ip 10.1.1.0 0.0.0.255 any

R1(config)#router isis
R1(config-router)#metric-style wide
!要支援route leaking必須啟用IS-IS wide metric
R1(config-router)#redistribute isis ip level-2 into level-1 distribute-list 100

R2(config)#access-list 100 permit ip 10.1.1.0 0.0.0.255 any

R2(config)#router isis
R2(config-router)#metric-style wide
!要支援route leaking必須啟用IS-IS wide metric
R2(config-router)#redistribute isis ip level-2 into level-1 distribute-list 100



2.Route-map

R1(config)#access-list 1 permit any

R1(config)#route-map LEAK permit 10
R1(config-route-map)#match ip address 1
R1(config)#route-map LEAK permit 20

R1(config)#router isis
R1(config-router)#metric-style wide
!要支援route leaking必須啟用IS-IS wide metric
R1(config-router)#redistribute isis ip level-2 into level-1 route-map LEAK

R2(config)#access-list 1 permit any

R2(config)#route-map LEAK permit 10
R2(config-route-map)#match ip address 1
R2(config)#route-map LEAK permit 20

R2(config)#router isis
R2(config-router)#metric-style wide
!要支援route leaking必須啟用IS-IS wide metric
R2(config-router)#redistribute isis ip level-2 into level-1 route-map LEAK