Users Guide

This phenomenon occurs where traffic is terminated on the switch. Traffic has not originated from the switch and is not
transiting the switch.
The switch accepts all traffic destined to the switch, which is received on management or front-end data port. Response traffic
with management port IP address as source IP address is handled in the same manner as switch originated traffic.
Switch-Originated Traffic
This phenomenon occurs where traffic is originating from the switch.
1. Management Applications (Applications that are configured as management applications):
The management port is an egress port for management applications. If the management port is down or the destination
is not reachable through the management port (next hop ARP is not resolved, and so on), and if the destination is
reachable through a data port, then the management application traffic is sent out through the front-end data port. This
fallback mechanism is required.
2. Non-Management Applications (Applications that are not configured as management applications as defined by this
feature):
Non-management application traffic exits out of either front-end data port or management port based on routing table. If
there is a default route on both the management and front-end data port, the default for the data port is preferred route.
Behavior of Various Applications for Switch-Initiated
Traffic
This section describes the different system behaviors that occur when traffic is originating from the switch:
EIS Behavior: If the destination TCP/UDP port matches a configured management application, a route lookup is done in the EIS
table and the management port gets selected as the egress port. If management port is down or the route lookup fails, packets
are dropped.
EIS Behavior for ICMP: ICMP packets do not have TCP/UDP ports. To do an EIS route lookup for ICMP-based applications
(ping and traceroute) using the source ip option, the management port IP address should be specified as the source IP address.
If management port is down or route lookup fails, packets are dropped.
Default Behavior: Route lookup is done in the default routing table and appropriate egress port is selected.
Table 20. Behavior of Various Applications for Switch-Initiated Traffic
Protocol Behavior when EIS is Enabled Behavior when EIS is Disabled
dns EIS Behavior Default Behavior
ftp EIS Behavior Default Behavior
ntp EIS Behavior Default Behavior
radius EIS Behavior Default Behavior
Sflow-collector Default Behavior
Snmp (SNMP Mib response and SNMP
Traps)
EIS Behavior Default Behavior
ssh EIS Behavior Default Behavior
Internet Group Management Protocol (IGMP) 301