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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
471
Packets that are destined to the CPU can be classified into three groups. These groups, otherwise known as sub-
interfaces, 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 Sub-interface (Group) Description
802.1X
Protocol Port-based Network Access Control
ARP
Protocol Address resolution Protocol
DHCP
Protocol Dynamic Host Configuration Protocol
DNS
Protocol Domain Name System
DVMRP
Protocol Distance Vector Multicast Routing Protocol
GVRP
Protocol GARP VLAN Registration Protocol
ICMPv4
Protocol Internet Control Message Protocol
ICMPv6-
Neighbor
Protocol IPv6 Internet Control Message Protocol Neighbor Discovery
Protocol (NS/NA/RS/RA)
ICMPv6-Other
Protocol IPv6 Internet Control Message Protocol except Neighbor Discovery
Protocol (NS/NA/RS/RA)
IGMP
Protocol Internet Group Management Protocol
LACP
Protocol Link Aggregation Control Protocol
NTP
Protocol Network Time Protocol
OSPF
Protocol Open Shortest Path First
PIM
Protocol Protocol Independent Multicast
RIP
Protocol Routing Information Protocol
SNMP
Manage Simple Network Management Protocol
SSH
Manage Secure Shell
STP
Protocol Spanning Tree Protocol
Telnet
Manage Telnet
TFTP
Manage Trivial File Transfer Protocol
VRRP
Protocol Virtual Router Redundancy Protocol
Web
Manage 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.
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