D-Link DGS-3426P Product Manual - Page 16

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch Network RADIUS Forward EAPOL PDU HOL Prevention Jumbo Frame Syslog State Broadcast Ping Replay State ARP Aging time (0-65535) RADIUS on the Switch. The default setting is Enabled. The user may use the pull-down menu to Enable or Disable the Forward EAPOL PDU on the Switch. The default setting is Disabled. If this option is enabled it prevents the forwarding of data to a port that is blocked. Traffic that would normally be sent to the buffer memory of the Switch's TX queue is dropped so that memory usage is conserved and performance across all ports remains high. This field will enable or disable the Jumbo Frame function on the Switch. The default is Disabled. Max. Jumbo frame size = 9216 bytes if this is enabled. The user may globally enable or disable the Syslog function here by using the pull-down menu. The default is Disabled. The user may use the pull-down menu to Enable or Disable the broadcast ping relay. The user may set the ARP Aging Time here by entering a time between 0 and 65535 minutes. The default setting is 20 minutes. Click Apply to implement changes made. IPv6 The xStack® DGS-3400 has the capability to support the following: • IPv6 unicast, multicast and anycast addresses • Allow for IPv6 packet forwarding • IPv6 fragmentation and re-assembly • Processing of IPv6 packet and extension headers • Static IPv6 route configuration • IPv6 Neighbor Discovery • Link-Layer Address resolution, Neighbor Unreachability Detection, and Duplicate Address Detection over broadcast mediums (ex: Ethernet) • Send Router Advertisement • ICMPv6 functionality The following sections will briefly explain IPv6, its functionality and how IPv6 is implemented on this Switch. Overview IP version 6 is the logical successor to IP version 4. It was known that IPv4 could not support the amount of addresses that would eventually be needed for not only each person, but each device that would require an IP address, and therefore a system with a larger pool of IP addresses was required. IPv6 has addressed that issue, along with other issues that enhance routing over the network, provide better security and improve Quality of Service for Internet users. Some of the improvements made were: Expanding the Capabilities for IP Addressing - IPv6 has increased the size of the IP address from 32 bits to 128 bits. As a result, the addressing hierarchy has been greatly expanded, more nodes now have the capability of having a unique IP address and the method of assigning an IP address to an interface has become cleaner and quicker. Unicast and multicast addresses still exist but in a purer form and multicast addresses now have a scope field which increases the scalability of multicast routing. Also, an anycast address has been added, which will send packets to the closest node which is a part of a group of nodes, thereby eliminating a specified device for a particular group. Simplifying the Packet Header - The IPv6 packet header has been simplified from IPv4 as some headers have been modified or dropped altogether, which improves processing speed and cost. The IPv6 header now has a fixed length of 40 bytes consisting of an 8-byte header and two 16-byte IP addresses (source and destination). Extensions and Options Enhancement - Packet header option fields encoding has been enhanced to allow for proficient forwarding of packets due to lesser restrictions on packet option length and encoding method. This enhancement will also allow 7