Cisco has pledged to invest around $500m in the UK, part of which will go towards the East London Tech City scheme to develop a competitor to Silicon Valley in the British capital.
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The NLB default setting is unicast mode. In unicast mode, NLB replaces the actual MAC address of each server in the cluster to a common NLB MAC address. When all the server in the cluster have the same MAC address, all packets forwarded to that address are sent to all members of the cluster. However, a problem with this configuration is when the servers NLB cluster are connected to the same switch, you cannot have two ports on the switch register the same MAC address. NLB solves this problem by masking the cluster MAC address. The switch looks at the source MAC address in the Ethernet frame header in order to learn which MAC addresses are associated with its ports. NLB creates a bogus MAC address and assigns that bogus MAC address to each server in the NLB cluster. NLB assigns each NLB server a different bogus MAC address based on the host ID of the member. This address appears in the Ethernet frame header.
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