Moxa Technologies ioMirror E3210 Uživatelský manuál stáhnout pdf (Strana 7)

Modular Gigabit Ethernet Switches

Layer 3 Switching

Layer 3 switching is hardware-based and optimized to transmit data as

fast as Layer 2 switching, but Layer 3 switching uses the IP address to

make switching decisions, the same as a router. The 802.1Q VLAN of

a Layer 2 switch allows network operators to conﬁgure and maintain

networks more efﬁciently, but connecting from one VLAN to another

requires using a traditional Layer 3 switch or router. Compared to

software-based routers, Layer 3 switching provides a faster and less expensive way of using

hardware to optimize IP switching between LAN segments such as corporate intranets. By

using routing protocols and routing table to determine the best path, Layer 3 switching can

direct network trafﬁc and divide a large scale LAN into several subnets for better network

performance.

Static Routing

Instead of using the MAC table of a Layer 2 Ethernet switch, a

Layer 3 switch has a built-in IP routing table for forwarding IP

frames. Network administrators need to conﬁgure and maintain this

IP routing table manually.

Routing Information Protocol (RIP)

In addition to static routing, Layer 3 switches also have a built-in

IP routing table that can be set up and updated dynamically by

routing protocol. RIP is an often used routing protocol that uses

the Bellman-Ford algorithm and “hop count” measurement to

determine how packets should be routed from one network to

another.

Open Shortest Path First (OSPF)

Layer 3 switches support OSPF, which uses “Link State” instead

of “hop count” to determine the network route. Compared to RIP,

OSPF has faster network convergence and less network trafﬁc.

Virtual Router Redundancy Protocol (VRRP)

VRRP is an Internet protocol that provides a way to keep one or

more backup routers on standby when using a statically conﬁgured

router on a local area network (LAN).

Protocol Independent Multicast (PIM)

Protocol Independent Multicast (PIM) supports both Sparse Mode

and Dense Mode. PIM Sparse Mode (PIM-SM) is designed to

accommodate recipients of any multicast group who are sparsely

distributed throughout the network. In order to receive multicast

data, the Layer 3 switch must tell its upstream neighbors that they

are interested in particular groups and sources. On the other hand,

PIM Dense Mode (PIM-DM) is used when most subnets in the

network want to receive every multicast packet. Multicast data is

initially sent to all of the hosts on the network.

Distance Vector Multicast Routing Protocol

(DVMRP)

DVMRP is used to share information between routers to transport

IP multicast packets between networks. The router generates a

routing table for the multicast group that it knows about, along with

the corresponding distances. When a multicast packet is received,

it is forwarded as speciﬁed in the routing table.

www.moxa.com/support/white_papers

Gigabit Turbo Ring

LAN A

LAN B

LAN C

Connect up to 26

remote devices through

ber connections

EDS-828

EDS-728

Gigabit Fiber Optic Cable

(1000BaseSX/LX/LHX/ZX)

Fiber Optic Cable (100BaseFX)

www.moxa.com [email protected]

Layer 3 Switching

IP SYSTEMES, Distributeur officiel des solutions MOXA en FRANCE - Tèl : 04 72 14 18 00. Web : www.ip-systemes.fr - Mail : [email protected]

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