JNCIP OSPF area-range & EBGP Route Aggregation

sach157sach157 Member Posts: 1 ■□□□□□□□□□
In JNCIP exam book R 6 & R7 connects to rip router.

R6---Rip
172.16.40.0/30
R7---Rip
172.16.40.4/30

These routes are summarize on R5 as follows


area 0.0.0.20 {
area-range 172.16.40.0/28;


How come it is summarized by using /28 mask?


Also in EBGP case study these routes are redistributed in IBGO using /29 mask.


Regards
Sach

Comments

  • AldurAldur Juniper Moderator Member Posts: 1,460
    Does the book really show a /28? I guess that would work but a /29 is definitely the better choice since it's more specific.

    When in doubt go for the most specific.
    "Bribe is such an ugly word. I prefer extortion. The X makes it sound cool."

    -Bender
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