Based on the show ip route isis output on R1, which statement is true?
A.
The i su 10.1.0.0/23 route is a suppressed route.
B.
The i su 10.1.0.0/23 route is a summary route.
C.
The i su 10.1.0.0/23 route is an IS-IS external route.
D.
The R1 IS-IS router is an ASBR.
E.
The R1 IS-IS router is an ABR that belongs to multiple IS-IS areas.
F.
The R1 IS-IS router is performing route aggregation and is suppressing the more specific
10.1.0.0/23 prefix.
Explanation:
When viewing the “show IP route ISIS” output, the “su” entry represents a summarized route.
This is the direct result of the “summary-address” router configuration command. When
creating the summary route. The Cisco IOS automatically creates the summary route and
point it to interface Null 0.