D-Link DWS-3227P - xStack Switch - Stackable Uživatelský manuál stáhnout pdf (Strana 6)

Semaphore Technologies Pvt. Ltd. – (technolo[email protected]om)

on the switch are usually also provided. Managed switches are found in

medium or large "enterprise" networks and though more expensive are of

higher quality (e.g. with a backplane with higher transfer speeds). The task of

managing usually requires understanding of Layer 2 networks (e.g. Ethernet).

o Smart (or intelligent) switches — these are managed switches with a

limited set of features. Likewise "web-managed" switches are switches

which fall in a market niche between unmanaged and managed. For a

price much lower than a fully managed switch they provide a web

interface (and usually no CLI access) and allow configuration of basic

settings, such as VLANs, port-speed and duplex.

o Web-managed switches — Similar in functionality to a smart switch. A

Web-managed switch is configured through a browser instead of via a

desktop utility.

Traffic monitoring on a switched network

Unless port mirroring or other methods such as RMON or SMON are implemented in

a switch, is difficult to monitor traffic that is bridged using a switch, because all ports

are isolated until one transmits data, and even then only the sending and receiving

ports can see the traffic. These monitoring features rarely are present on consumer-

grade switches.

Two popular methods that are specifically designed to allow a network analyst to

monitor traffic are:

• Port mirroring — the switch sends a copy of network packets to a monitoring

network connection.

• SMON — "Switch Monitoring" is described by RFC 2613 and is a protocol for

controlling facilities such as port mirroring.

Another method to monitor may be to connect a Layer-1 hub between the monitored

device and its switch port. This will induce minor delay, but will provide multiple

interfaces that can be used to monitor the individual switch port.

Typical switch management features

(In order of basic to advanced):

• Turn some particular port range on or off

• Link speed and duplex settings

• Priority settings for ports

• MAC filtering — and other types of "port security" features which prevent MAC

flooding

• Use of Spanning Tree Protocol

• SNMP monitoring of device and link health

• Port mirroring (also named: port monitoring, spanning port, SPAN port,

roving analysis port, link mode port)

• Link aggregation (also called: bonding/trunking)

• VLAN settings

• 802.1X network access control

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