OSPF Type-2 Network-LSA Format
Below lists the fields in the OSPF Type-2 Network-LSA:
|Network Mask||Indicates the subnet mask on the transit network.|
|Attached Router||Lists the Router IDs of all routers on the multi-access network that have established FULL adjacency with the DR and the DR itself.|
Below shows the Type-2 Network-LSA originated from RT2:
RT1#sh ip ospf database network OSPF Router with ID (184.108.40.206) (Process ID 100) Net Link States (Area 0) Routing Bit Set on this LSA LS age: 91 Options: (No TOS-capability, DC) LS Type: Network Links Link State ID: 10.10.10.2 (address of Designated Router) Advertising Router: 220.127.116.11 LS Seq Number: 80000001 Checksum: 0xA29A Length: 32 Network Mask: /24 Attached Router: 18.104.22.168 Attached Router: 22.214.171.124 RT1#
Note: Type-2 Network-LSAs are not necessary be generated for LAN interfaces. Type-2 LSAs are generated only when necessary, which there is more than one router attached to the LAN.