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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
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The fields that can be configured in SMTP Mail Receiver Address are described below:
Parameter Description
Add a Mail Receiver
Enter the email address of the receiver here. This string can be up to 254
characters long.
Click the Add button to add a new SMTP email recipient.
The fields that can be configured in Send a Test Mail to All are described below:
Parameter Description
Subject
Enter the subject of the email here. This string can be up to 128 characters long.
Content
Enter the content of the email here. This string can be up to 512 characters long.
Click the Apply button to accept the changes made.
Click the Delete All button to delete all the entries found in the display table.
Click the Delete button to delete the specified entry.
NLB FDB Settings
This window is used to display and configure the Network Load Balancing (NLB) FDB settings. The 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 is usually not the source MAC address of a packet.
When the received packet contains a destination MAC address that 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.
NOTE: Link Aggregation cannot be configured across multiple Switch units in the stack when the
NLB feature is enabled.
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