MES1000, MES2000 Ethernet Switches 13
functioning components of the aggregated channel.
Allows to identify voice traffic by OUI (Organizationally Unique Identifier—first 24
bits of MAC address). If MAC address with VoIP gateway or IP phone OUI exists in
the MAC table of the switch, this port will be automatically added to voice vlan
(identification by SIP protocol or destination MAC address is not supported).
This function allows to manipulate the SPVLAN (Service Provider's VLAN) external
identifier based on the configured filtering rules by the external VLAN identifier
(Customer VLAN). Selective Q-in-Q allows to add or change SPVLAN tag for the
packet in the specific network section.
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)
Device can obtain IP address automatically via BootP/DHCP protocol.
ARP Protocol
(Address Resolution
Protocol)
ARP protocol 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.
2.2.5 QoS functions
Table 2.5 lists the basic quality of service functions.
Table 2.5 —Basic quality of service functions
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.
802.1p class of service
support
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. Switches can use 802.1p priority value for frame distribution
between priority queues.
2.2.6 Security functions
Table 2.6 —Security functions
Switch function designed for protection from DHCP protocol 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.
Option, that allows to inform DHCP server about DHCP relay and port of incoming
request.
By default, the switch with DHCP snooping function enabled identifies and drops
all DHCP requests with Option 82, if they were received via untrusted port.
Broadcast UDP traffic forwarding to the specified IP address.
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