Samsung Ubigate iBG1000, Руководство пользователя

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CHAPTER 3. Software Overview
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© SAMSUNG Electronics Co., Ltd.
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Unicast Routing
Protocols
Description
OSPFv2: The Open
Shortest Path First
The Open Shortest Path First (OSPF) protocol is an
interior gateway protocol (IGP) that routes packets within
a single autonomous system (AS). OSPF uses link-state
information to make routing decisions, making route
calculations using the shortest path first (SPF) algorithm
(also referred to as the Dijkstra algorithm).
Each router running OSPF floods link-state
advertisements throughout the AS that contain
information about that router’s attached interfaces and
routing metrics. Each router takes the information in
these link-state advertisements and creates a complete
routing table for the network.
OSPF was designed for the TCP/IP environment and as
a result explicitly supports IP sub netting and the tagging
of externally derived routing information. OSPF also
provides for the authentication of routing updates.
OSPF routes IP packets based solely on the destination
IP address contained in the IP packet header.
OSPF quickly detects topological changes, such as when
router interfaces become unavailable, and calculates
new loop-free routes quickly and with a minimum of
routing overhead traffic.
Multicast Routing Protocols
The following Multicast routing modules are supported.
Multicast Routing
Protocols
Description
IGMPv2: Internet Group
Membership Protocol
The Internet Group Management Protocol (IGMP) is
used between IP hosts and IP routers. IP Host reports
their multicast group membership to the neighboring
multicast routers expressing their desire to receive
multicast traffic destined for the group. Multicast routers
use IGMP to learn, for each of their attached physical
networks, which groups have members. IGMP should be
enabled on both hosts and routers that want to receive
multicast traffic.