Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 388

Table 36. 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 If source TCP/UDP port matches a management Traffic from management port selected based on route lookup application and source IP address is management port to data port and in EIS table. If the management port port IP address, management port is the from data port to is down or the route lookup fails, preferred egress port selected based on route management port is packets are dropped. lookup in EIS table. If management port is down blocked or route lookup fails, packets are dropped 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 Traffic 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 configured as a management application • EIS is disabled implies that either EIS feature itself is disabled or that the application is not configured as a management application Transit Traffic This phenomenon occurs where traffic is transiting the switch. Traffic 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 Traffic 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: 388 Internet Group Management Protocol (IGMP)