An enterprise administrator configures route summarization on ASBRs to reduce the number of inter-area
Type 3 LSAs, which in turn reduces the routing table size and improves device resource utilization.
Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is
preemptive by default, whereas the IS-IS DIS is not preemptive by default.