Hardware And Software Switching - Cisco Catalyst 4500 Series Software Configuration Manual

Catalyst 4500 Series Switch Implementation of CEF
Figure 36-1
Integrated Switching Engine (ASIC)
L3 physical
interface
Gig 1/1
The Integrated Switching Engine performs inter-VLAN routing on logical Layer 3 interfaces with the
ASIC hardware. The ASIC hardware also supports a physical Layer 3 interface that can be configured
to connect with a host, a switch, or a router.
This section contains the following subsections:
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Hardware and Software Switching

For the majority of packets, the Integrated Switching Engine performs the packet forwarding function in
hardware. These packets are hardware-switched at very high rates. Exception packets are forwarded by
the CPU subsystem software. Statistic reports should show that the Integrated Switching Engine is
forwarding the vast majority of packets in hardware. Software forwarding is significantly slower than
hardware forwarding, but packets forwarded by the CPU subsystem do not reduce hardware forwarding
speed.
Figure 36-2
components.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
36-4
Logical L2/L3 Switch Components
Logical Router
L3 logical
interfaces
VLAN1
L2 switchports
Hardware and Software Switching, page 36-4
Load Balancing, page 36-6
Software Interfaces, page 36-6
shows a logical view of the Integrated Switching Engine and the CPU subsystem switching
Chapter 36
VLAN2
Configuring Cisco Express Forwarding