D-Link DGS-1520 User Manual - Page 481

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide Packets that are destined to the CPU can be classified into three groups. These groups, otherwise known as subinterfaces, are logical interfaces that the CPU will use to identify certain types of traffic. The three groups are Protocol, Manage, and Route. Generally, the Protocol group should receive the highest priority when the Switch's CPU processes received packets and the Route group should receive the lowest priority as the Switch's CPU usually does get involved in the processing of routing packets. In the Protocol group, packets are protocol control packets identified by the router. In the Manage group, packets are destined to any router or system network management interface by means of interactive access protocols, like Telnet and SSH. In the Route group, packets are identified as traversing routing packets that is generally processed by the router CPU. In the following table a list of supported protocols are displayed with their respective sub-interfaces (groups): Protocol Name 802.1X ARP DHCP DNS DVMRP GVRP ICMPv4 ICMPv6Neighbor ICMPv6-Other Sub-interface (Group) Protocol Protocol Protocol Protocol Protocol Protocol Protocol Protocol Protocol IGMP LACP NTP OSPF PIM RIP SNMP SSH STP Telnet TFTP VRRP Web Protocol Protocol Protocol Protocol Protocol Protocol Manage Manage Protocol Manage Manage Protocol Manage Description Port-based Network Access Control Address resolution Protocol Dynamic Host Configuration Protocol Domain Name System Distance Vector Multicast Routing Protocol GARP VLAN Registration Protocol Internet Control Message Protocol IPv6 Internet Control Message Protocol Neighbor Discovery Protocol (NS/NA/RS/RA) IPv6 Internet Control Message Protocol except Neighbor Discovery Protocol (NS/NA/RS/RA) Internet Group Management Protocol Link Aggregation Control Protocol Network Time Protocol Open Shortest Path First Protocol Independent Multicast Routing Information Protocol Simple Network Management Protocol Secure Shell Spanning Tree Protocol Telnet Trivial File Transfer Protocol Virtual Router Redundancy Protocol Hypertext Transfer Protocol (HTTP) and Hypertext Transfer Protocol Secure (HTTPS) A customized rate limit (in packets per second) can be assigned to the Safeguard Engine's sub-interfaces as a whole or to individual protocols specified by the user in the management interface. Be careful when customizing the rate limit for individual protocols, using this function, as improper rate limits can cause the Switch to process packets abnormally. NOTE: When Safeguard Engine is enabled, the Switch will allot bandwidth to various traffic flows (ARP, IP) using the FFP (Fast Filter Processor) metering table to control the CPU utilization and limit traffic. This may limit the speed of routing traffic over the network. 471