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What is the difference between OSPF Exteral Type 1 (O E1) &
External Type 2 (O E2) routes????
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Answer Posted / kamalpreet singh
when we redistribute a protocol in ospf, by default it
accept those route as E2 in ospf domain. E1 & E2 is external
type 1 and rxternal type 2. in Cisco external route are E2
by nature.
Basically difference between E1 and E2 is : E1 includes
internal cost to ASBR added to external cost, E2 does not
include internal cost. it is same as external cost.
E1 is prefered if route is equal cost path exist.
Example: R1-R2-R3 is connected and R3 is a ASBR. and suppose
a cost of between R1 to R2 is 10 and R2 to R3 is 10. Cost
of external router on R3(asbr) is 1800. now if you thik
about E1 cost to external route from R1 is (10+10+1800) 1820
but in case of E2 it is 1800..
E1 is usefull when there are multiple ASBR to same
destination and E2 is usefull when there is only one ASBR in
to reach destinaltion.
for any query, intv.que@gmail.com
| Is This Answer Correct ? | 19 Yes | 0 No |
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