Concept Guide

Table 36. Mapping of Management Applications and Trac Type
Trac type /
Application type
Switch initiated trac Switch-destined trac Transit Trac
EIS Management
Application
Management is the preferred egress
port selected based on route lookup
in EIS table. If the management port
is down or the route lookup fails,
packets are dropped.
If source TCP/UDP port matches a 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
Trac from management
port to data port and
from data port to
management port is
blocked
Non-EIS
management
application
Front-end default route will take
higher precedence over
management default route and SSH
session to an unknown destination
uses the front-end default route
only. No change in the existing
behavior.
If source TCP/UDP port matches a management
application and the source IP address is a
management port IP address, the management
port is the preferred egress port selected based
on route lookup in EIS table. If the management
port is down or the route lookup fails, packets
are dropped
Trac from management
port to data port and
from data port to
management port is
blocked
• EIS is enabled implies that EIS feature is enabled and the application might or might not be congured as a management application
• EIS is disabled implies that either EIS feature itself is disabled or that the application is not congured as a management application
Transit Trac
This phenomenon occurs where trac is transiting the switch. Trac has not originated from the switch and is not terminating on the
switch.
• Drop the packets that are received on the front-end data port with destination on the management port.
• Drop the packets that received on the management port with destination as the front-end data port.
Switch-Destined Trac
This phenomenon occurs where trac is terminated on the switch. Trac has not originated from the switch and is not transiting the
switch.
The switch accepts all trac destined to the switch, which is received on management or front-end data port. Response trac with
management port IP address as source IP address is handled in the same manner as switch originated trac.
Switch-Originated Trac
This phenomenon occurs where trac is originating from the switch.
1 Management Applications (Applications that are congured 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 trac is sent out through the front-end data port. This fallback mechanism is required.
2 Non-Management Applications (Applications that are not congured as management applications as dened by this feature):
Non-management application trac 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 Trac
This section describes the dierent system behaviors that occur when trac is originating from the switch:
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Internet Group Management Protocol (IGMP)