Behavior of Various Applications for Switch-Destined TrafficThis section describes the different system behaviors that occur when traffic is terminated on the switch.Traffic has not originated from the switch and is not transiting the switch. Switch-destined traffic isapplicable only for applications which act as server for the TCP session and also for ICMP-basedapplications like ping and traceroute. FTP, SSH, and Telnet are the applications that can function asservers for the TCP session.EIS Behavior: If source TCP or UDP port matches an EIS management or a non-EIS managementapplication and source IP address is management port IP address, management port is the preferredegress port selected based on route lookup in EIS table. If the management port is down or the routelookup fails, packets are dropped.If the source TCP/UDP port or source IP address does not match the management port IP address, aroute lookup is done in the default routing table.EIS behavior for ICMP: ICMP packets do not have TCP/UDP ports. In this case, to perform an EIS routelookup for ICMP-based applications (ping and traceroute), you must configure ICMP as a managementapplication. If the management port is down or the route lookup fails, packets are dropped.If source IP address does not match the management port IP address route lookup is done in the defaultrouting table.Default Behavior: Route lookup is done in the default routing table and appropriate egress port isselected.Table 36. Behavior of Various Applications for Switch-Destined TrafficProtocol Behavior when EIS is Enabled Behavior when EIS is Disabledftp EIS Behavior Default Behaviorhttp EIS Behavior Default Behaviorssh EIS Behavior Default BehaviorSnmp (snmp mib response) EIS Behavior Default Behaviortelnet EIS Behavior Default Behavioricmp (ping and traceroute) EIS Behavior for ICMP Default BehaviorInterworking of EIS With Various ApplicationsStacking• The management EIS is enabled on the master and the standby unit.• Because traffic can be initiated from the Master unit only, the preference to management EIS table forswitch-initiated traffic and all its related ARP processing is done in the Master unit only.• ARP-related processing for switch-destined traffic is done by both master and standby units.VLTInternet Group Management Protocol (IGMP) 373
