OSPF recently in learning, have a question want to ask you, is all Dother must establish adjacency relations with the DR and BDR? And the adjacent path only jump distance? Thank you very much!

CodePudding user response:

DR and BDR election only will be in the broadcasting network, and a broadcast network is usually use switches connected, the distance should be is what you call a jump (OSPF if not speak jump this concept), if there are multiple hops, so it is the different type radio network,
, of course, if a link on the two routers only, and use the Ethernet interface connection, type by default is a broadcast network, also the DR and BDR election, at this time in order to improve the efficiency of the network, also it can be configured to OSPF point-to-point type, then it won't be the DR and BDR election,

CodePudding user response:

reference 1st floor weixin_40290083 response:

DR and BDR election only will be in the broadcasting network, and a radio network usually use switches connected, the distance should be is what you call a jump (OSPF if not speak jump this concept), if there are multiple hops, so it is the different type radio network,
, of course, if a link on the two routers only, and use the Ethernet interface connection, type by default is a broadcast network, also the DR and BDR election, at this time in order to improve the efficiency of the network, also it can be configured to OSPF point-to-point type, then it won't be the DR and BDR election,

Thank you very much for answering! Still have a question, is refers to as long as it can form the TCP transport channel, dother and Dr And BDR can establish adjacency relations? I jump is refers to the directly connected between two routers, more jump refers to the transfer between two routers through multiple routers,

CodePudding user response:

Of three layer under the OSPF protocol didn't noticed that should or TCP protocol,

CodePudding user response:

All the original poster hello, DRother between DR and BDR, must establish adjacency (FULL) relationship, between DRother, 2 - way relationship, OSPF between DR and BDR and DRother establishment and TCP transport channel, has nothing to do, TCP is a transport layer protocol, OSPF routing protocol, is the discovery of routing, as a result of the OSPF is based on a network segment, it is really only one TTL value, can build a topology at package

CodePudding user response:

Find out relationship between
Members of the dother is area
DR or BDR role is to help message message to establish adjacency relations between different regions of the
OSPF routing concept, his route is through an LSA calculated thanks
OSPF principle - & gt; Establish adjacency relations - & gt; Synchronous database - & gt; Calculate the routing table