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LSA Type Explanation - lsa-1 [type 1 LSA - router LSA] detailed explanation
2022-07-05 06:28:00 【Gucheng 286】
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(5)—— Case list ( according to LSA-1 Draw the topology ):
One 、LSA—1:
(1)—— brief introduction :
- Router LSA(Router LSA): Every router will produce a router LSA notice . This is the most basic LSA The announcement lists all links or interfaces of the router , Their states and the outbound overhead along each link direction are indicated , And all known on the chain OSPF neighbor . these LSA Announcements will only be made within the area from which they originated flooding Spread . Through the command show ip ospf database router You can view all routers listed in the database LSA notice . It mainly describes the topology .
- produce : The router in the area will generate a unique LSA-1
- Flood boundary range : Only here Inside the area flooding , Will not enter into other areas ,
(2)—— Header information :
- Ls/ age : Aging time ,1800~~3600 second , among 1800s It's cyclical LSA Refresh time ,3600s yes LSA Maximum aging room
- Options : optional
- LS Type: router
- Link State ID : This LSA Who made it , Just take this router RID Written here
- Advertising Router : This LSA Who made it , Just take this router RID Written here
- LS Seq Number : LSA The serial number of , Use this serial number to determine LSA Is the latest ,LSA Every update , Serial number +1
- Checksum ; Parity sum , Used to verify the integrity of teaching data transmission
- Length : It contains the total length of header information and data part
- Number of Links :
(3)—— Data section :
- V : Set as 1 Represents the virtual link configuration node (0——1)
- E : Set as 1 Representative Representative ASBR Router (0——1)
- B : Set as 1 Delegate delegate is a ABR Router interface (0——1)
Interface link type | link ID Express : | Link data representation : | Interface cost value |
Point to point | Neighbor's RID | Interface to connect neighbors IP | cost value |
radio broadcast | DR The interface of IP Address | Connect DR Interface IP Address | cost value |
stub( Peripheral ) | Loopback interface 32 position IP Address | Loopback interface 32 Mask | cost value |
Virtual link | Like point-to-point | Like point-to-point | cost value |
- Interface cost value =10 Of 8 Power / Interface bandwidth (100M)=1
- The link type is point-to-point : By default, only the interface is serial port or E1 Interface 、T1 Interface 、POS In the case of WAN interface, this interface OSFF The link type is point-to-point link
- The type is broadcast : By default, only the interface is Ethernet interface (FO/0, GO/0,T0/O), This interface OSPF The link type is broadcast
- Link type stub : Loopback interface ,OSPF The default loopback interface in the network is stub type , Even if the loopback interface is configured according to 24 Bit mask configured , however OSPF It will still loop back to the interface according to 32 Bit host routes for notification updates , Unless the link type of the loopback interface is changed to point-to-point :
R1(config)#int loopback l R1(config-if)#ip ospf network point-to-point R1(config-if) #exit
(4)—— The illustration :
(5)—— Case list ( according to LSA-1 Draw the topology ):
show ip ospf database router—— see
The above is only a personal point of view , If there are any mistakes, please point out ! Feel free to leave a comment !
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