Explaining OSPF In Networking-
Guyz we have already learned Eigrp and its various terms and characteristics in our previous sessions. So this session is dedicated to learning OSPF in networking. So let's begin.
OSPF in networking stands for open shortest path first and is a link state protocol which uses the shortest path first algorithm(SPF) also called as Dijkstra's algorithm to find the best path. OSPF is open standard protocol and so this protocol is currently being used by many vendors including Cisco. This open standard characteristic of OSPF helps in connecting two different routers from different vendors and that makes it very popular and flexible.
OSPF in networking stands for open shortest path first and is a link state protocol which uses the shortest path first algorithm(SPF) also called as Dijkstra's algorithm to find the best path. OSPF is open standard protocol and so this protocol is currently being used by many vendors including Cisco. This open standard characteristic of OSPF helps in connecting two different routers from different vendors and that makes it very popular and flexible.
OSPF uses an area for employing hierarchical network design, so the routers will only communicate and form adjacency neighbor relationship with routers in the same area, this characteristic of OSPF in networking is also called as single area OSPF.
Note:- You can also form neighbor relationship with routers in different areas using backbone area also called as area 0, since its a lengthy topic that would need a whole another dedicated session.
Since OSPF is a link state protocol it doesn't advertise distance to the directly connected networks, instead, it sends the link status to the neighbors using link-state advertisement(LSA's). Remember OSPF also sends change triggered update, it sends updates(LSA's), when there is a change to one of its link status.
OSPF maintains three main type of table-
OSPF maintains three main type of table-
- Routing Table- Contains only the best route to the remote networks
- Topology Table- Contains list of all the possible routes to all the known network
- Neighbor Table- Contains list of all the neighboring routers along with their router ID
OSPF In Networking- Top Standout Characteristics And Features
- OSPF supports both IPv4 and IPv6 networks
- The administrative distance of OSPF is 110
- It is link state protocol that uses cost as its metric which is calculated on the basis of bandwidth of the link.
- OSPF is an open standard protocol that uses SPF also called as Dijkstra's algorithm for path selection
- Unlike Eigrp which has limited hop count for sending routing updates, OSPF has unlimited hop count and its the better solution for big enterprise whereas thousands of routers are involved.
- OSPF uses an area to identify routers using common routing strategy.
- It minimizes routing update traffic, as the update is change triggered not a periodic one.
- OSPF uses multicast address either of 224.0.0..05(For all OSPF routers) or 224.0.0.6(All designated routers).
- OSPF supports VLSM and CIDR
- OSPF is open standard protocol and hence it supports multiple vendors.
- It only supports manual summary, There is no auto-summary in OSPF.
READ ALSO:- WHAT IS SPLIT HORIZON
READ ALSO:- WHAT IS STATIC ROUTING?
READ ALSO:- WHAT IS DYNAMIC ROUTING?
The above mentioned are the main standout characteristics of OSPF in networking. Learn it and you are good to go for an interview. Also In my next session, I will explain some important terms of OSPF like LSA's and etc. So guys after reading this if you have some doubts or question ask me in the comment section. Also, don't forget to share and subscribe for more such awesome posts. See you guys in next class.
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