Refer to the exhibit. An engineer is trying to generate a summary route in OSPF for network 10.0.0.0/8, but the summary route does not show up in the routing table.
Why is the summary route missing?
Refer to the exhibit. An engineer is trying to generate a summary route in OSPF for network 10.0.0.0/8, but the summary route does not show up in the routing table.
Why is the summary route missing?
The summary route is not appearing in the routing table because there are no specific routes within the 10.0.0.0/8 network present in the routing table. OSPF generates a summary route only when there are more specific routes within the summarized range. Since there are no routes for any subnets inside 10.0.0.0/8 in the routing table, the summary route is not generated.
the command "summary-address" is used to summary external routes (O E1/2) in ASBR. The command "redistribute static" in the question makes the router a ASBR. To summary inter area routes into ABRs you use "area x range" command. In both cases the summary route is advertised only if the RIB has a route that matches the summary prefix.
I have tested in lab, the summary-address only worked if you have the valid route on your routing table.
C is correct. OSPF will only generate a summary route if there are specific subnets within the summary range that are active in the routing table since there are no routes within the 10.0.0.0/8 network in the routing table, OSPF has no more specific routes to summarize and therefore the summary route is not generated. The summary-address command is used on OSPF ASBR.
The given answer is correct
C is correct
given answer is the correct.
What about A? this is not an ABR, it only has area 0
This summary command is not for ABRs, it's for ASBRs, so Option A is wrong.
The given answer is correct
The given answer is correct
C is ok
The given answer is correct