iBGP and eBGP question

[trinawong]

Hi All,

If a router running both iBGP and eBGP, iBGP local preference is 250, eBGP local preference 100, be default, what's the route it should choose? and Why?

Thank you,

[n.nandrekar]

Harold, To your reply stating "AD will never be used to compare 2 bgp routes" , I would like to comment that we indirectly are. I mean, the path selection criteria #7 states that prefer e-bgp over i-bgp. So though we are not looking and comparing the AD, its just another way to look at it; isn't it?

:)

[lamav]

Marwan:

I was interpreting your response within the context of the question that was asked.

"If a router running both iBGP and eBGP, iBGP local preference is 250, eBGP local preference 100, be default, what's the route it should choose?"

Then your answer:

"simply always if u have route reachable through IBGP and EBGP EBGP will be selcted"

It seems as though you are saying that, NO MATTER WHAT, even given the circumstances given in the question, eBGP will always be selected.

If you meant that all other things being equal that eBGP will be selected, then you are right.

Shukrun

Victor

[Harold Ritter]

Niranjan,

Step #7 is not about the AD but rather about internal vs. external. You could change the AD for eBGP to be higher than iBGP and the BGP best path selection process would still select the external path over the internal path, given that all attributes compared in the previous steps are equals.

Regards,

[Harold Ritter]

Harish,

The eBGP path is preferred over the iBGP path, assuming that all previous steps in the BGP best path selection process were equals.

Regards,

[rcsl]

For the practical scenario of this discussion >> https://roshanznet.blogspot.com/2019/08/route-preference-of-ebgp-over-ibgp-and.html 

Hope this will clear your confusion..

[Odetayo Adelabu]

---

@rcsl wrote:

For the practical scenario of this discussion >> https://roshanznet.blogspot.com/2019/08/route-preference-of-ebgp-over-ibgp-and.html 

Hope this will clear your confusion..

---

THE LINK ABOVE IS A CLICKBAIT. PLEASE DO NOT CLICK!!!