Cisco 6513 - Catalyst Switch Datenblatt - Seite 14

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Telephony Services Modules

• Communications Media Module (CMM)—Provides ﬂexible, high-density T1 and E1 gateways, allowing

organizations to connect their existing time-division multiplexing (TDM) networks to their IP communications

networks, and providing connectivity to the PSTN. For more information, visit:

http://www.cisco.com/en/US/products/hw/modules/ps3115/products_data_sheet09 186a00800e9c1f.html

Wireless Services Modules

• Wireless LAN Services Module (WLSM)—Enables campus-wide fast secure WLAN roaming within and across

IP subnets, enhances WLAN security (e.g. user group segmentation and Catalyst integrated security services),

and simpliﬁes WLAN deployment and management.

Switch Fabric Modules

Designed to support distributed forwarding for interface modules that have distributed forwarding capability,

the Cisco Catalyst 6500 Series SFM or SFM2, in combination with the Cisco Catalyst 6500 Series Supervisor Engine

2-MSFC2 and DFCs on interface modules, increases available system bandwidth from 32 to 256 Gbps. The

SFM/SFM2 supports the Cisco Catalyst 6500 CEF256 and dCEF256 interface modules.

Designed to support new interface modules with 720 Gbps forwarding capabilities, the Supervisor Engine 720's

onboard switch fabric increases available bandwidth to 720 Gbps and enables packet forwarding rates up to

400 Mpps. By using auto-sensing and auto-negotiation, the Supervisor 720 switch fabric is fully interoperable with

the 8- and 16-Gbps switch fabric interconnections used by the CEF256 and dCEF256 interface modules. When a

CEF256 or dCEF256 interface module is detected, the switch fabric will automatically connect those modules by

offering 8-16 Gbps of bandwidth to each module, as applicable.

How Cisco Express Forwarding Works

Cisco Express Forwarding (CEF) is a Layer 3 technology that provides increased forwarding scalability

and performance to handle many short-duration trafﬁc ﬂows common in today's enterprise and service provider

networks. To meet the needs of environments handling large amounts of short-ﬂow, Web-based, or highly interactive

types of trafﬁc, CEF forwards all packets in hardware, and maintains its forwarding rate completely independent

of the number of ﬂows going though the switch.

On the Cisco Catalyst 6500 Series, the CEF Layer 3 forwarding engine is located centrally on the supervisor engine's

PFC2 or PFC3—the same device that performs hardware-based Layer 2 and 3 forwarding, ACL checking, QoS

policing and marking, and NetFlow statistics gathering.

Using the routing table that Cisco IOS Software builds to deﬁne conﬁgured interfaces and routing protocols, the CEF

architecture creates CEF tables and downloads them into the hardware-forwarding engine before any user trafﬁc

is sent through the switch. The CEF architecture places only the routing preﬁxes in its CEF tables—the only

information it requires to make the Layer 3 forwarding decisions—relying on the routing protocols to do route

selection. By performing a simple CEF table lookup, the switch forwards packets at wire-rate, independent

of the number of ﬂows transiting the switch.

CEF-based forwarding requirements: Requires a Cisco Catalyst Supervisor Engine 2 or Catalyst Supervisor

Engine 720.

Cisco Systems, Inc.

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