ZyXEL Communications GS-4012F, Руководство пользователя

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GS-4012F User’s Guide
Chapter 1 Getting to Know Your Switch 33
IP Multicast
With IP multicast, the switch delivers IP packets to a group of hosts on the network - not
everybody. In addition, the switch can send packets to Ethernet devices that are not VLAN-
aware by untagging (removing the VLAN tags) IP multicast packets.
RIP
RIP (Routing Information Protocol allows a routing device to exchange routing information
with other routers.
OSPF
OSPF (Open Shortest Path First) is a link-state protocol designed to distribute routing
information within an autonomous system (AS). An autonomous system is a collection of
networks using a common routing protocol to exchange routing information. OSPF is best
suited for large networks.
DVMRP
DVMRP (Distance Vector Multicast Routing Protocol) is a protocol used for routing multicast
data within an autonomous system (AS). DVMRP provides multicast forwarding capability to
a layer 3 switch that runs both the IPv4 protocol (with IP Multicast support) and the IGMP
protocol.
VRRP
Virtual Routing Redundancy Protocol (VRRP), defined in RFC 2338, allows you to create
redundant backup gateways to ensure that the default gateway of a host is always available.
STP (Spanning Tree Protocol) / RSTP (Rapid STP)
(R)STP detects and breaks network loops and provides backup links between switches,
bridges or routers. It allows a switch to interact with other (R)STP -compliant switches in your
network to ensure that only one path exists between any two stations on the network.
Link Aggregation
Link aggregation (trunking) is the grouping of physical ports into one logical higher-capacity
link. You may want to trunk ports if for example, it is cheaper to use multiple lower-speed
links than to under-utilize a high-speed, but more costly, single-port link.
Port Authentication and Security
For security, the switch allows authentication using IEEE 802.1x with an external RADIUS
server and port security that allows only packets with dynamically learned MAC addresses
and/or configured static MAC addresses to pass through a port on the switch.