Routers - Samsung OfficeServ 7200 System Description

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IGMP Snooping
L2 switch (located in the lower layer of the IP router) without the Internet Group
Management Protocol (IGMP) function is located between the IP router and multicast
group member (host), intercepts the IGMP messages. Then the L2 switch operates in the IP
router like the group member and operates in the group member like the IP router, which is
referred to as IGMP Snooping.
The IP layer multicast group information included in the IGMP message is reflected in the
MAC filtering database, its own switching database. The group information is processed in
the MAC multicast address format mapped with the IP multicast address.

4.3.2 Routers

Various Network Interfaces
The OfficeServ 7200 provides the P1~4 network interfaces, which are connected to the
WAN or LAN through an Ethernet interface, provides the serial network connected through
the V.35 serial interface.
Static Routing
The OfficeServ 7200 configures a fixed routing table between each network interface to
process the static routing. In this case, the routing table cannot be dynamically changed by
the routing protocol, and specific routing services will be provided according to the pre-set
routing policy.
WAN Interface (Ethernet, PPPoE, DHCP Client)
The OfficeServ 7200 accesses the Internet through the P1~P4 interface by using the PPPoE
and DHCP client protocols.
V.35 Interface (PPP, HDLC, Frame Relay)
The OfficeServ 7200 accesses the Internet through the V.35 serial interface in a transfer
speed of up to 2Mbps. In this case, the OfficeServ 7200 supports various environments
using the functions such as the PPP, HDLC, and Frame Relay Encapsulation.
Subnet Routing
The network interfaces of the P1~4 are configured with different sub-network interfaces,
which enable them to perform the routing process with each other.
GRE Tunneling (Generic Routing Encapsulation)
The GRE Tunneling creates a virtual tunnel to provide a logical, non-physical path. A GRE
tunnel over IPSec method, interconnected with the VPN, is used for general purposes.
In this case, the original IP header and the payload are encapsulated/encrypted to ensure
confidentiality.
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