Cisco 3550 12G - Catalyst Switch - Stackable Bedienungsanleitung PDF herunterladen (Seite 3)

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These features allow network administrators to prioritize

mission-critical and/or bandwidth-intensive trafﬁc, such

as ERP (Oracle, SAP, etc.), voice (IP telephony trafﬁc) and

CAD/CAM over less time-sensitive applications such as

FTP or email (SMTP). For example, it would be highly

undesirable to have a large ﬁle download destined to one

port on a wiring closet switch and have quality

implications such as increased latency in voice trafﬁc,

destined to another port on this switch. This condition is

avoided by ensuring that voice trafﬁc is properly classiﬁed

and prioritized throughout the network. Other

applications, such as web-browsing, can be treated as

low priority and handled on a best-efforts basis.

Sophisticated Trafﬁc Management

The Catalyst 3550-12T is capable of performing rate

limiting via its support of the Cisco Committed Access

Rate (CAR) functionality. Through CAR, bandwidth

can be guaranteed in increments as low as 8K. Bandwidth

can be allocated based on several criteria including

MAC source address, MAC destination address, IP

source address, IP destination address, and TCP/UDP

port numbers. Bandwidth allocation is essential in

network environments requiring service-level agreements

or when it is necessary for the network manager to control

the bandwidth given to certain users. In addition to

CAR functionality, the Catalyst 3550-12T supports

128 aggregate or individual policers. This gives the

network administrator very granular control of the

LAN’s bandwidth.

Enhanced Security and Management

Through Integrated IOS Features

The Catalyst 3550-12T can offer enhanced data security

through the use of ACLs. By denying packets based on

source and destination MAC addresses, IP addresses, or

TCP/UDP ports, users can be restricted from sensitive

portions of the network. Also, due to the fact that all ACL

lookups are done in hardware, forwarding and routing

performance is not compromised when implementing

ACL-based security in the network.

Network managers can also implement higher levels of

data security and boost LAN performance by deploying

up to 1005 VLANs per switch. This ensures that data

packets are forwarded only to stations within a speciﬁc

VLAN, creating separate collision domains between

groups of ports on the network and reducing broadcast

transmission. VLAN trunks can be created from any port

using the standards-based 802.1Q or Cisco ISL VLAN

trunking architecture. In addition, Private VLAN Edge

provides security and isolation between ports on a switch,

ensuring that trafﬁc travels directly from its entry point to

the aggregation device through a virtual path and cannot

be directed to a different port. Local Proxy ARP works in

conjunction with Private VLAN Edge to minimize

broadcasts and maximize available bandwidth. For

superior security management, the Catalyst 3550-12T

supports standard and extended access control lists

(ACLs) on VLAN ports as well as routed ports.

With the Catalyst 3550-12T Multilayer switch, network

managers can implement high levels of console security.

Multilevel access security on the switch console and the

web-based management interface prevents unauthorized

users from accessing or altering switch conﬁguration.

Terminal Access Controller Access Control System

(TACACS+) authentication enables centralized access

control of the switch and restricts unauthorized users

from altering the conﬁguration.

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