14
MES3000 Ethernet switch series
2.2.4
Third-layer functions of OSI model
Table 2.4 lists third-layer functions (OSI Layer 3).
Table 2.4 —Third-layer functions description (OSI Layer 3)
BootP and DHCP clients
(Dynamic Host
Configuration Protocol)
MES3000 devices can obtain IP address automatically via BootP/DHCP.
Static IP routes
Administrator of the switch can add or remove static records into/from the
routing table.
ARP
(Address Resolution
Protocol)
ARP establishes match between the IP address and the physical address of the
device. The match is established on the basis of the network host response
analysis; host address is requested with the broadcast packet.
RIP
(Routing Information
Protocol)
Dynamic routing protocol that allows routers to get new routing information from
the neighboring routers. This protocol provides optimum route detection on the
basis of hops count data.
IGMP Proxy
IGMP Proxy is a function for simplified routing of multicast data between
networks. IGMP is used for routing management.
OSPF protocol
Dynamic routing protocol is based on link-state technology and uses Dijkstra's
shortest path algorithm
.
OSPF protocol distributes information on available routes
between routers in a single stand-alone system.
VRRP
VRRP is designed for reservation of routers acting as a default gateway. This is
performed by aggregation of router group IP interfaces into single virtual
interface, that will be used as a default gateway for computers in the network.
2.2.5
QoS functions
Table 2.5 lists the basic quality of service functions.
Table 2.5 —Basic quality of service functions
Priority queues support
The switch supports outbound traffic prioritization with queues for each port.
Packet distribution to queues may be performed via packet classification by
various fields in packet headers.
IEEE 802.1p class of
service support
IEEE 802.1p standard specifies frame priority definition method and algorithm of
priority usage for timely delivery of delay-critical traffic. 802.1p standard defines 8
priority levels. MES3000 switches can use 802.1p priority value for frame
distribution between priority queues.
2.2.6
Security functions
Table 2.6 —Security functions
DHCP Snooping
Switch function designed for protection from DHCP attacks. Enables filtering of
DHCP messages coming from untrusted ports by building and maintaining DHCP
snooping binding database. DHСP snooping performs firewall function between
untrusted ports and DHCP servers.