Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario descargar pdf (Pagina 5)

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processor is responsible for creating and maintaining Cisco Express Forwarding and adjacency

tables while pushing this information down to the PFC for hardware forwarding, QoS, and security

functionality. Other functions residing on the route processor include IP address resolution (ARP)

and routing table maintenance.

Policy Feature Card (PFC)

The PFC is the application-specific integrated circuit (ASIC) forwarding complex for the system.

The PFC performs the hardware-based features and services at a high performance level (tens of

millions of packets per second). Features such as Layer 2 bridging, Layer 3 routing, access

control, QoS marking and policing, NetFlow statistics, and multicast are implemented within the

PFC.

Software Implementation

Native Cisco IOS Software model mandates that both CPUs (switch processor and route

processor) run the full Cisco IOS Software operating system. There is no hidden Cisco Catalyst

software running in the switch, and the executable images used by both CPUs run the complete

Cisco IOS Software kernel. With both processors running Cisco IOS Software, overall system

performance is enhanced.

In contrast, the Cisco Catalyst OS operates on the switch processor and the PFC to provide Layer

2 forwarding and Layer 3/4 services. Should the user require Layer 3 forwarding/routing

capabilities, the MSFC daughter card must be present and runs Cisco IOS Software (as part of the

hybrid OS) on the route processor.

Software Feature Support

The two software models—Cisco Catalyst OS, and Cisco IOS Software—on the Cisco Catalyst

6500 Series are not at complete feature parity. The following table presents the Cisco Catalyst OS

and Cisco IOS Software support for some of the more commonly used protocols. Note that many

features in Cisco IOS Software are not platform specific (for example, the Open Shortest Path First

[OSPF], Border Gateway Protocol [BGP], or Protocol Independent Multicast [PIM] protocols). In

these cases, the Cisco IOS Software features in the hybrid OS are identical to those in Cisco IOS

Software.

Table 1 lists commonly used features available through the Cisco Catalyst OS Version 8.6 and

Cisco IOS Software Release 12.2(33)SXH. Feature support is hardware dependent where noted.

Table 1. Software Comparison

Software Feature Cisco Catalyst OS Cisco IOS

Software

VLAN ranges: up to 4096 VLAN SVIs (Layer 3 VLAN Interfaces) x x

Inter VLAN Routing x x

4096 Layer 2 VLANs x x

Private VLANs x x

Dynamic VLANs x

Trunking: IEEE 802.1q, ISL x x

DTP, VTP x x

VTPv3 x

IEEE 802.1q Tunneling x x

Layer 2 Protocol Tunneling x x

1 2 3 4 5 6 7 8 9 10 ... 50 51

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