Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.1P1 - Page 371
Handling of Transit Traffic (Traffic Separation), Mapping of Management Applications and Traffic Type
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• 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 35. 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 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 Traffic from management port to data port and from data port to management port is blocked Internet Group Management Protocol (IGMP) 371
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