Addendum

Behavior of Various Applications for Switch-Destined
Traffic
This section describes the different system behaviors that occur when when traffic is terminated on the
switch. Traffic has not originated from the switch and is not transiting the switch. Switch destined traffic is
applicable only for applications which acts as server for the TCP session and also for ICMP based
applications like ping and traceroute. FTP, SSH, and Telnet are the applications that can function as
servers for the TCP session.
EIS Behavior : If source TCP or UDP port matches an EIS management or a non-EIS management
application and source IP address is management port IP address, management port is the preferred
egress port selected based on route lookup in EIS table . If Management port is down or route lookup
fails packets are dropped.
If source TCP/UDP port or source IP address does not match the management port IP address route
lookup is done in the default routing table.
EIS behavior for ICMP : ICMP packets does not have TCP/UDP ports. In this case, to perform an EIS route
lookup for ICMP based applications (ping and tracerout), you must configure ICMP as a management
application. If Management port is down or route lookup fails packets are dropped.
If source IP address does not match the management port IP address route lookup is done in the default
routing table.
Default Behavior : Route lookup is done in the default routing table and appropriate egress port is
selected.
Protocol Behavior when EIS is Enabled Behavior when EIS is Disabled
ftp EIS Behavior Default Behavior
http EIS Behavior Default Behavior
ssh EIS Behavior Default Behavior
Snmp (snmp mib response) EIS Behavior Default Behavior
telnet EIS Behavior Default Behavior
icmp (ping and traceroute) EIS Behavior for ICMP Default Behavior
Interworking of EIS With Various Applications
Stacking
• The management EIS is enabled on the master and the standby unit.
• As Traffic can be initiatedfrom the Master unit only, the preference to management EIS table for
switch 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.
VLT
VLT feature is for the front end port only. As this feature is specific to the management port, this feature
can co-exist with VLT and nothing specific needs to be done in this feature to handle VLT scenario.
DHCP
• If DHCP Client is enabled on the management port, a management default route is installed to the
switch.
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Egress Interface Selection (EIS) for HTTP and IGMP Applications