Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Instrukcja Użytkownika Pobierz pdf (Strona 4)

Cisco Systems, Inc.

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Figure 2

Cisco Catalyst 6500 Processors

Switch Processor Functions

The Switch Processor runs a 250-Mhz R7000 CPU (Supervisor 2) and controls all chassis operations. This includes

the detection of Online Insertion and Removal (OIR) events, power management, environmental management, and

redundancy management. It also handles the download of the appropriate line card ﬁrmware to each line card. The

Switch Processor handles basic port management (setting of port conﬁguration, detection of link state, etc.) along

with other Layer 2 functions such as Spanning Tree, VLAN Trunking Protocol (VTP), Interior Gateway Multicast

Protocol (IGMP) snooping, and Dynamic Trunking Protocol (DTP). Finally, the SP provides console connection

during initial system boot.

Route Processor Functions

The Route Processor (RP) runs a 300-Mhz R7000 CPU (MSFC2) and provides Layer 3 functions such as routing and

Cisco Express Forwarding table creation. Cisco Express Forwarding is the default Layer 3 forwarding mechanism.

Although the actual packet forwarding takes place in the hardware, the RP’s creation of the Cisco Express

Forwarding and adjacency tables are critical. Along with the Policy Feature Card (PFC), the RP provides QoS and

security functionality as well. Other functions that run on the RP 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 in the hardware of the PFC. The PFC relies on the SP and RP control plane functions

for managing the hardware functionality.

Software Implementation

The key to Cisco IOS mode is that both CPUs (SP and RP) run the full Cisco IOS Software. There is no hidden

Catalyst software running on the box and the executable images used by both CPUs run the complete IOS kernel.

Both processors on Cisco IOS Software are used to improve overall system performance. Should the MSFC fail, all

Layer 2/3/4 functionality is lost. The RP provides the systemconsole connection oncethe system isfully operational.

In contrast, CatOS operates on the SPand the PFC to provide Layer 2 forwarding and Layer 3/4services. 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). Thus, should the MSFC fail in this model, Layer 2 functionality is not affected

and remains operational.

MSFC Route

Processor (RP)

Policy Feature Card

(PFC)

Catalyst Supervisor Switch Processor (SP)

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