Users Guide

NOTE: Egress Interface Selection (EIS) works only with IPv4 routing.
When the feature is enabled using the management egress-interface-selection command, the following events are
performed:
• The CLI prompt changes to the EIS mode.
• In this mode, you can run the application and no application commands
• Applications can be configured or unconfigured as management applications using the application or no application
command. All configured applications are considered as management applications and the rest of them as non-management
applications.
• All the management routes (connected, static and default) are duplicated and added to the management EIS routing table.
• Any new management route added is installed to both the EIS routing table and default routing table.
• For management applications, route lookup is preferentially done in the management EIS routing table for all traffic. management port
is the preferred egress port. For example, if SSH is a management application, an SSH session to a front-panel port IP on the peer box
is initiated via management port only, if the management port is UP and management route is available.
• If SSH request is received on the management port destined to the management port IP address, the response to the request is sent
out of the management port by performing a route lookup in the EIS routing table
• If the SSH request is received on the front-end port destined for the front-end IP address, the response traffic is sent by doing a route
lookup in the default routing table only.
• If the management port is down or route lookup fails in the management EIS routing table, packets are dropped.
• For all non-management applications, traffic exits out of either front-end data port or management port based on route lookup in
default routing table.
• Ping and traceroute are always non-management applications and route lookup for these applications is done in the default routing
table only.
• For ping and traceroute utilities that are initiated from the switch, if reachability needs to be tested through routes in the management
EIS routing table, you must configure ICMP as a management application.
• If ping and traceroute are destined to the management port IP address, the response traffic for these packets is sent by doing route
lookup in the EIS routing table.
When the feature is disabled using the no management egress-interface-selection command, the following operations are
performed:
• All management application configuration is removed.
• All routes installed in the management EIS routing table are removed.
Handling of Management Route Configuration
When the EIS feature is enabled, the following processing occurs:
• All existing management routes (connected, static and default) are duplicated and added to the management EIS routing table.
• Any management static route newly added using the management route CLI is installed to both the management EIS routing table
and default routing table.
• As per existing behavior, for routes in the default routing table, conflicting front-end port routes if configured has higher precedence
over management routes. So there can be scenarios where the same management route is present in the EIS routing table but not in
the default routing table.
• Routes in the EIS routing table are displayed using the show ip management-eis-route command.
• In the netstat output, the prefix “mgmt” is added to routes in the EIS table so that the user can distinguish between routes in the EIS
Routing table and default routing table.
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Internet Group Management Protocol (IGMP)