D-Link DXS-3400 Emulator - Page 691
Network Load Balancing NLB Commands
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DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide 70. Network Load Balancing (NLB) Commands 70-1 nlb unicast-fdb This command is used to add a unicast MAC entry to the NLB unicast address table. Use the no form of this command to remove a unicast entry from the NLB unicast address table or remove interfaces from an NLB entry. nlb unicast-fdb MAC-ADDR interface INTERFACE-ID [, | -] no nlb unicast-fdb MAC-ADDR [interface INTERFACE-ID [, | -]] Parameters MAC-ADDR interface INTERFACE-ID , - Specifies the MAC address of the entry. The address must be a unicast address. If a received packet contains a destination MAC address that matches the specified MAC address, it will be forwarded to the specified interface. Specifies the interface to which the matched packets will be forwarded. Only physical ports are valid interfaces. (Optional) Specifies a series of interfaces, or separate a range of interfaces from a previous range. No space is allowed before and after the comma. (Optional) Specifies a range of interfaces. No space is allowed before and after the hyphen. Default None. Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline This command is used to create an NLB unicast MAC entry. The Network Load Balancing (NLB) function is used to support the Microsoft server load balancing application where multiple servers can share the same IP address and MAC address. The requests from clients will be forwarded to all the servers, but will only be processed by one of them. The server can work in two different modes: • Unicast mode: The client uses a unicast MAC address as the destination MAC address to reach the server. • Multicast mode: The client uses a multicast MAC address as the destination MAC address to reach the server. This destination MAC address is called the shared MAC address. However, the server uses its own MAC address (rather than the shared MAC address) as the source MAC address in the reply packet. In other words, a NLB unicast address usually is not the source MAC address of a packet. When the received packet contains the destination MAC address matches the configured unicast MAC address, it will be forwarded to those configured ports, regardless of the VLAN membership configuration. Administrators cannot configure a static address of the MAC address table as a NLB address. However, if a MAC address is created as a NLB MAC address entry, the same MAC address can be still dynamically learnt in the Layer 2 MAC address table. In this situation, the NLB has higher priority; the dynamically learnt FDB entry won't take effect. 687
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