Which feature can be used to reduce the number of ICMP unreachable message egressing a router?
A. uRPF
B. ICMP rate-limiting(upendra)
C. ip unreachables command
D. Asymmetric routing
Which feature can be used to reduce the number of ICMP unreachable message egressing a router?
B
http://www.ciscopress.com/articles/article.asp?p=345618&seqNum=5
Using the ICMP Rate-Limiting Feature
Starting in 12.0 of the Cisco IOS, Cisco implemented a default rate limit of one ICMP unreachable packet that a router would generate in a 500-millisecond (ms) interval. This prevents a router from responding to thousands of packets with unreachable destinations with a separate ICMP message for each of these access requests