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Chapter 46 NLB
XS3800-28 User’s Guide
339
46.1.2 What You Need to Know
NLB
Network Load Balancing (NLB) is a feature developed by Microsoft. NLB enhances the performance
reliability for critical applications by sharing traffic with multiple servers in a cluster using TCP/IP protocol.
Each server of a cluster tackles a copy of a traffic. You can create a cluster by grouping up to 32 servers
together.
If a server in a cluster fails, traffic will be redistributed to the other operating servers. When the server is
back in service, it will join the cluster automatically and share the traffic.
Unicast Mode
NLB replaces the real MAC addresses of the servers in a cluster with a unicast MAC address. Each server
uses the same unicast MAC address, and a switch cannot map the unicast MAC address to a port. This
forces a switch to flood traffic meant for the cluster to all ports of the switch to make sure the traffic is
forwarded to the right destination.
The servers in a cluster cannot communicate with each other, because they use the same unicast MAC
address.
Multicast Mode
NLB assigns a multicast MAC address to the servers in a cluster. Therefore, each server has two MAC
addresses, the real MAC address and the multicast MAC address.
Create static ARP entries on a switch for the servers, so the switch will only forward traffic to the servers of
the cluster.
The servers in a cluster can communicate with each other, because they keep their real MAC address
and already have their own IP addresses.
46.2 IP Configuration
Use this screen to view and configure the IP and MAC address mapping of a cluster for layer-3
forwarding. You should use the MAC address added in the
SWITCHING
>
NLB
>
MAC Forwarding
screen.
Click
SWTICHING
>
NLB
>
IP Configuration
to display the screen as shown.
Note: The settings configured in the
SWITCHING
>
NLB
>
IP Configuration
and
NETWORKING
>
ARP Setup
>
Static ARP
screens cannot duplicate.
Содержание XS3800-28
Страница 29: ...29 PART I User s Guide...
Страница 54: ...54 PART II Technical Reference...
Страница 88: ...Chapter 4 Web Configurator XS3800 28 User s Guide 88 Figure 51 Online Web Help...
Страница 123: ...Chapter 13 Neighbor XS3800 28 User s Guide 123 Figure 77 MONITOR Neighbor Neighbor Details Standalone Mode...
Страница 139: ...Chapter 17 System Information XS3800 28 User s Guide 139 Figure 90 MONITOR System Information Standalone Mode...
Страница 148: ...Chapter 20 Cloud Management XS3800 28 User s Guide 148 Figure 94 SYSTEM Cloud Management...
Страница 221: ...Chapter 33 Green Ethernet XS3800 28 User s Guide 221 Figure 149 PORT Green Ethernet Standalone Mode...
Страница 263: ...Chapter 36 OAM XS3800 28 User s Guide 263 Figure 182 PORT OAM OAM Status OAM Details...
Страница 334: ...Chapter 44 Multicast XS3800 28 User s Guide 334 Figure 248 MVR Group Configuration Example View...
Страница 406: ...Chapter 54 Spanning Tree Protocol XS3800 28 User s Guide 406 Figure 302 MSTP and Legacy RSTP Network Example...
Страница 420: ...Chapter 57 VLAN XS3800 28 User s Guide 420 Figure 315 SWITHCING VLAN VLAN Setup Static VLAN Add Edit Standalone Mode...
Страница 439: ...Chapter 57 VLAN XS3800 28 User s Guide 439 Figure 336 SWITCHING VLAN Port Based VLAN Setup Port Isolation...
Страница 540: ...Chapter 72 VRRP XS3800 28 User s Guide 540 Figure 434 VRRP Example 2 VRRP Status on Switch B...
Страница 581: ...Chapter 77 Policy Rule XS3800 28 User s Guide 581 Figure 456 Policy Example...
Страница 658: ...Chapter 86 Port Security XS3800 28 User s Guide 658 Figure 521 SECURITY Port Security Standalone Mode...
Страница 678: ...Chapter 87 MAINTENANCE XS3800 28 User s Guide 678 Figure 542 MAINTENANCE Configuration Configure Clone Stacking Mode...
Страница 680: ...Chapter 87 MAINTENANCE XS3800 28 User s Guide 680 Figure 543 MAINTENANCE Diagnostic Standalone Mode...
Страница 684: ...Chapter 87 MAINTENANCE XS3800 28 User s Guide 684 Figure 545 MAINTENANCE Firmware Upgrade Standalone Mode...
Страница 747: ...747 PART III Troubleshooting and Appendices...