Cisco 3550-24 - Catalyst SMI Switch Manual de usuario descargar pdf (Pagina 2)

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multicast routing, inter-virtual LAN (VLAN) routing,

routed access control lists (RACLs),and the Hot Standby

Router Protocol (HSRP). After initial deployment, the

Enhanced Multilayer Software Image Upgrade Kit gives

users the ﬂexibility to upgrade to the EMI. The Catalyst

3550-12T and 3550-12G are only available with the

Enhanced Multilayer Software Image.

Figure 1 Catalyst 3550-24 Intelligent Ethernet Switch

Figure 2 Catalyst 3550-48 Intelligent Ethernet Switch

Figure 3 Catalyst 3550-12G and 3550-12T Intelligent

Ethernet Switches

Intelligence in the Network

Networks of today are evolving to address four new

developments at the network edge:

• Increase in desktop computing power

• Introduction of bandwidth-intensive applications

• Expansion of highly sensitive data on the network

• Presence of multiple device types, such as IP phones

and wireless LAN access points

These new demands are contending for resources with

manyexisting mission-criticalapplications.Asaresult, IT

professionalsmust viewtheedgeofthe networkascritical

to effectively manage the delivery of information and

applications.

As companies increasingly rely on networks as the

strategicbusinessinfrastructure, itismoreimportant than

ever to ensure their high availability, security, scalability

and control. By adding Cisco intelligent functionality to

the wiring closet, customers can now deploy network-

wideintelligentservicesthataddresstheserequirementsin

aconsistentwayfromthedesktoptothecoreandthrough

the WAN.

With Cisco Catalyst Intelligent Ethernet switches, Cisco

enables companies to realize the full beneﬁts of adding

intelligent services into their networks. Deploying

capabilities that make the network infrastructure highly

available to accommodate time-critical needs, scalable

to accommodate growth, secure enough to protect

conﬁdential information, and capable of differentiating

and controlling trafﬁc ﬂows are key to further optimizing

network operations.

Network Control through Advanced

Quality of Service and Rate Limiting

The Cisco Catalyst 3550 offers superior Layer 3 granular

QoS features to ensure that network trafﬁc is classiﬁed,

prioritized, and congestion is avoided in the best possible

manner. The Catalyst 3550 can classify, reclassify, police,

and mark the incoming packets before the packet is

placed in the shared buffer. Packet classiﬁcation allows

the network elements to discriminate between various

trafﬁc ﬂows and enforce policies based on Layer 2 and

Layer 3 QoS ﬁelds.

To implement QoS, ﬁrst, the Catalyst 3550 switches

identify trafﬁc ﬂows, or packet groups, and classiﬁes or

reclassiﬁes these groups using the Differentiated Services

CodePoint ﬁeld(DSCP) and/orthe 802.1pclass ofservice

(CoS) ﬁeld. Classiﬁcation and reclassiﬁcation can be

based on criteria as speciﬁc as the source/destination IP

address,source/destination MediaAccess Control(MAC)

address or the Layer 4 Transmission Control Protocol

(TCP)/UserDatagram Protocol(UDP) port.Attheingress,

the Catalyst 3550 will also perform policing and marking

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