What is the difference between OSPF Exteral Type 1 (O E1) &
External Type 2 (O E2) routes????
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Answer Posted / jitendera kumar sinha
a very good question-
here is specification between two
i am going to explain brefly
please read it carefully.
Route redistribution is the process of taking routes
learned via one routing protocol and injecting those routes
into another routing domain. (Static and connected routes
can also be redistributed.) When a router running OSPF takes
routes learned by another routing protocol and makes them
available to the other OSPF-enabled routers it's
communicating with, that router becomes an Autonomous System
Border Router (ASBR).
Let's work with an example where R1 is running both OSPF and
RIP. R4 is in the same OSPF domain as R1, and we want R4 to
learn the routes that R1 is learning via RIP. This means we
have to perform route redistribution on the ASBR. The routes
that are being redistributed from RIP into OSPF will appear
as E2 routes on R4:
what is asbr-Autonomous System Border Router
(ASBR).Autonomous System Boundary Router (ASBR) is a router
located between an OSPF autonomous system and a non-OSPF
network (such as RIP). ASBRs run both OSPF and another
routing protocol, such as RIP. ASBRs must reside on a
non-stub OSPF area.
and this type of route is called ospf e2 route
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