Users Guide

• Management application packet counter is incremented if EIS route lookup succeeds and packet is sent out of the
management port.
• If route lookup in the EIS routing table fails or if the management port is down, then packets are dropped. The management
application drop counter is incremented.
• Whenever IP address is assigned to the management port, it is stored in a global variable in the IP stack, which is used for
comparison with the source IP address of the packet.
• Rest of the response traffic is handled as per existing behavior by doing route lookup in the default routing table. So if the
traffic is destined to the front-end port IP address, the response is sent out by doing a route lookup in the default routing
table, which is an existing behavior.
Consider a sample topology in which ip1 is an address assigned to the management port and ip2 is an address assigned to any
of the front panel port. A and B are end users on the management and front-panel port networks. The OS-initiated traffic for
management applications takes a preference for ip1 as source IP and uses the management network to reach the destination. If
the management port is down or the route lookup in EIS routing table fails, ip2 is the source IP and the front-panel port is used
to reach the destination. The fallback route between the management and data networks is used in such a case. At any given
time, end users can access Dell Networking OS applications using either ip1 or ip2. Return traffic for such end-user-originated
sessions destined to management port ip1 is handled using the EIS route lookup.
Handling of Transit Traffic (Traffic Separation)
This is forwarded traffic where destination IP is not an IP address configured in the switch.
• Packets received on the management port with destination on the front-end port is dropped.
• Packets received on the front-end port with destination on the management port is dropped.
• A separate drop counter is incremented for this case. This counter is viewed using the netstat command, like all other IP
layer counters.
Consider a scenario in which ip1 is an address assigned to the management port and ip2 is an address assigned to any of the
front panel port of a switch. End users on the management and front panel port networks are connected. In such an
environment, traffic received in the management port destined on the data port network is dropped and traffic received in the
front-end port destined on the management network is dropped.
Mapping of Management Applications and Traffic Type
The following table summarizes the behavior of applications for various types of traffic when the management egress interface
selection feature is enabled.
Table 34. Mapping of Management Applications and Traffic Type
Traffic type /
Application type
Switch initiated traffic Switch-destined traffic Transit Traffic
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
Traffic 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
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
Traffic from
management port to
data port and from data
Internet Group Management Protocol (IGMP) 338