Cisco 3550 12G - Catalyst Switch - Stackable Manual de usuario descargar pdf (Pagina 4)

Presentation_ID

444

Meeting Customer Requirements with

Intelligent Ethernet Services

• L2 switches are limited to the processing and forwarding of L2 info

• Multilayer switches can look deeper into the frame => intelligent decisions

based on L3 and/or L4 info

• Examples of why this is useful:

Preserve bandwidth by limiting traffic based on a user’s IP address

Preserve bandwidth by limiting traffic based on applications using a constant TCP/UDP port number

– web browsing, ERP applications, etc.

Prevent access to network resources based on user’s IP address

Classify and marking of traffic based on L3 QoS (DSCP)

Customer Requirements that require a multilayer switch:

• Preventing access to sensitive network resources (Access Control Lists)

• Preserving bandwidth by limiting certain users to a smaller portion of the available

bandwidth (rate-limiting)

• Advanced Quality of Service by prioritizing traffic by marking the Layer 3 QoS field

(Differentiated Services Code Point)

MAC DA

MAC SA

length

802.1Q/1p

IP header

info

TOS

…

IP SA

IP DA

…

TCP/UDP

header

DATA

Layer 2 info

Layer 3 info

Layer 4 info

* Not to Scale

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Cisco 3550 12G - Catalyst Switch - Stackable Manual de usuario Pagina 4