Revisiting – Why IGP sync with LDP is required ?
Hi All,
I was preparing some content on MPLS for a training session and as a part of it, was going through LDP. The interesting aspect is very obvious
-> LDP is dependent on IGP
-> What ever Draw-backs IGP has will be inherited by LDP
-> LDP has to be enabled on the Interface to exchange Labels, else it wont consider the exit-interface from IGP and hence there will be no LSP’s
So far so good and makes sense as well
I will not be boring with command line outputs in this case
-> I have disabled the interface between R3/R4 so if R3 Has to reach R1, it will use R3-R2-R1 path
All good, Am going to just tweak the metric of the interface on R3 -> R2 before I enable back the R3 – R4
Now let me enabled the interface between R3-R4
-> It has a Better cost
-> It has not been enabled for LDP
If we go back to R3, to examine the result
This is dangerously familiar for me 
, There is a LDP neighbor, but No routes are present in Inet.3 (neither for R1 or R2) as Routes Continue reading
Arista is also working with HPE’s Aruba and VMware as part of its foray into the campus. This is an area where Cisco dominates.
