Recently I got a call from one of my followers, asking if we have three routes
10.10.10.0/24 via bgp
10.10.10.0/24 via ospf
10.10.0.0/16 via eigrp
which route will take for 10.10.10.1??
Now the basic funda is,
Route selection precedence is as follows
1. Most Specific route
2. AD value
3. Metric
Now here most specific routes are
10.10.10.0/24 via bgp
10.10.10.0/24 via ospf
Now AD value will come in the picture as tie breaker....
Take a look at the following Table for AD values
Default Administrative Distances
Connected 0
Static 1
eBGP 20
EIGRP (internal) 90
IGRP 100
OSPF 110
IS-IS 115
RIP 120
EIGRP (external) 170
iBGP 200
EIGRP summary route 5
Now the Answer is a question, Which BGP route was that, EBGP or IBGP??
If it is IBGP (AD value: 200), OSPF routes will get precedence…. Else it gonna take BGP routes (AD Value: 20)
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