Dell PowerConnect 5548 User Guide - Page 203

All IPv6 address formats are acceptable, yet for display purposes, the system displays the most abbreviated form, which replaces groups of zeros with double colons and removes the leading zeros. IPv6 Prefixes While Unicast IPv6 addresses written with their prefix lengths are permitted, in practice their prefix lengths are always 64 bits, and therefore are not required to be expressed. Any prefix that is less than 64 bits is a route or address range that summarizes a portion of the IPv6 address space. For every assignment of an IP address to an interface, the system runs the Duplicate Address Detection (DAD) algorithm to ensure uniqueness. An intermediary transition mechanism is required for IPv6-only nodes to communicate with IPv6 nodes over an IPv4 infrastructure. The tunneling mechanism implemented is the Intra-Site Automatic Tunnel Addressing Protocol (ISATAP). This protocol treats the IPv4 network as a virtual IPv6 local-link, with each IPv4 address mapped to a Link Local IPv6 address. IPv4 Interface Parameters You can assign IP addresses to the interface in the following ways: • Manual Assignment - Described below • DHCP Server Assignment - Described in "DHCP IPv4 Interface" on page 207 Multiple IP addresses can be configured in the IPv4 Interface Parameters pages. These IP addresses can be assigned to a port, LAG, or VLAN interface. When an IP address is assigned, it is checked for uniqueness in the following way: • A gratuitous ARP request is sent three times every three seconds. • If after (3+1)*3 = 12 seconds the switch has not received the ARP response, the IP address is considered to be unique. • During the procedure the switch has to reply to gratuitous ARP and probe ARP requests with the validated IP address. Dell PowerConnect 55xx Systems User Guide 203