The order in which routing paths are selected

[Christopher_Escalante]

Router R1 have to establish connectivity with router R2 loopback26 interface. Which route R1 will choose as first one, which as second and third ?
Note: there is no route redistribution configured between protocols on any of the routers.

[paul driver]

Hello
In this scenario no redistribution no route path manipulation or interface costing change’s 

1-static

2-eigrp

3-ospf

[marce1000]

@Christopher_Escalante 

 - Note this person seems to be flooding the forums with questions about study-material. To the author : this is not the purpose of the technical forums which is intended for specific technical situations and related problems

 M.

[Joseph W. Doherty]

What determines precedence of route selection is basically AD and then a routing protocol's internal rules.

What @paul driver notes is correct using default AD values, but they can be modified, so without knowing those, your question cannot really be answered.

Also BTW, Cisco did (still does?) have a separate Learning forum which would be more suitable for these kinds of questions.

[Richard Burts]

@Joseph W. Doherty skips over a step. Before the router considers AD it looks at prefix length. As I read the original post the static route is /24 while the EIGRP and OSPF routes are /32. So while the static route would win on AD it loses when considering prefix length.

[paul driver]

Hello
Whoa! well spotted Richard I  didn’t notice that little nugget, assumption was all equal, that’s a bit naughty of the questionarie!! 

Longer prefix always take precedence over AD

[Richard Burts]

Yes that was a subtle and a bit tricky part.

[Joseph W. Doherty]

"Yes that was a subtle and a bit tricky part."

@Richard Burts, indeed, a great catch!  (However, diagram did show what EIGRP and OSPF were advertising.  Possibly like @paul driver, assumed all equal.)

It could have been even more fun if the destination loopback interface was defined with a /24.  OSPF, by default, will still advertise as /32 (because loopback).  Don't know EIGRP well enough to know what prefix length it would attach for loopback with /24, by default, but expect Rick knows.

[paul driver]

Hello

@Joseph W. Doherty  - Has got a point if the loopback is definitively specified as /24 but with no p2p network type then naturally the preference would be static/eigrp/ospf however with ospf P2p network type on the loopback then it would be ospf/static/eigrp....I beleive ..lol

[Joseph W. Doherty]

Touche!