neigbourship and adjacency

[jonk34567]

Ospf , Eigrp , Rip , Bgp which of these form neigbourship and adjacency.can anyone give me a complete list

[Julio E. Moisa]

Hi

In order to become in Neighbors the routers must know their requirements, for Example in OSPF:

- The interfaces between neighbors should be in the same Area 0
- The interfaces between neighbors should be configured into the same segment of network
- The interfaces between neighbors must be configured on the same network type
- The interfaces between neighbors must use the same MTU value
- They must use the same timers

In EIGRP
- The EIGRP process must be configured with the same AS
- The interfaces between the routers must be configured with the same segment of network

In RIP
- The routing process must configured with the same version

In BGP
- The neighbors interface should be configured with the same MTU value
- The BGP routers must uses the neighbor command to enable the adjacency
- Verify if they are using ebgp-multihop or ttl-security

Now once the routers meet the requirements and everything is ok they can create an adjacency.

Thank you in advance. 

[jonk34567]

as far as i know only ospf can form adjacency ? can adjacency be formed in rip,bgp and eigrp ? 

[Richard Burts]

You are correct that OSPF is the only routing protocol that explicitly has a adjacency function.

HTH

Rick

[Julio E. Moisa]

Hi

Every routing protocol can create adjacency with their neighbors, in OSPF the word "adjacency" is most used explicitly. 

Adjacency can be defined as a relationship between 2 network devices in order to exchange routing information. RIP, EIGRP, IS-IS and BGP protocol can form adjacency as well. In BGP it is also known as BGP peering.

https://networklessons.com/eigrp/detailed-look-of-eigrp-neighbor-adjacency/

http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/200293-IS-IS-Adjacency-and-Area-Types.html

http://www.networknewz.com/networknewz-10-20060403BGPAdjacencyStates.html