The Avaya SBC network interface gateways are not responding to PING commands issued during high call traffic. PING commands from the command line nor the administration GUI return any results. This occurs when doing Internet Control Message Protocol (ICMP) monitoring from the customer Network Management System (NMS).
Cause
ICMP traffic receives low priority based on other traffic on Avaya SBC. The Avaya SBC firewall limits the traffic based on priority. Because of this designed set of priorities, ICMP responses are rate limited. On data interfaces, where ICMP traffic should be minimal, a threshold of 1% of the available bandwidth is allowed for ICMP traffic. ICMP traffic is treated as a lower priority to more important traffic, such as active calls, and ICMP requests will be dropped during high call traffic periods.
