Access network IP addresses

Each server module has both physical and virtual access network IP addresses. To ensure that access to the HCP S Series Node is not disrupted by the unavailability of a single server module, clients should use the virtual IP addresses to communicate with the S Series Node. Communications that use a virtual IP address for an unavailable server module are automatically redirected to the available server module. When the unavailable server module becomes available again, communications using the virtual IP address for that module revert back to that module.

The access network can have an IP mode of either IPv4 or IPv6. If the IP mode is IPv4, the two server modules must have access network IPv4 addresses on the same IPv4 subnet. If the IP mode is IPv6, the two server modules must have primary access network IPv6 addresses on the same IPv6 subnet. In all cases, the virtual IP address for a server module must be on the same subnet as the physical IP address.

With an IP mode of IPv6, the server modules can also have secondary physical and virtual access network IPv6 addresses. These addresses must be on the same IPv6 subnet, and that subnet must not overlap the primary access network subnet. If one server module has a secondary access network IPv6 address, the other server module must also have a secondary access network IPv6 address.

The table below shows a sample IPv6 configuration for the access network.

The access network subnet or subnets cannot overlap the subnets for the S Series Node management and server interconnect networks.