Cisco Wide Area Application Engine 612 Bedienungsanleitung PDF herunterladen (Seite 28)

102 Chapter 4: Network Integration and Interception

This example uses inbound redirection on the interface connecting to the client subnet and

the serial interface connecting to the WAN. Because outbound redirection is not used, the

ip wccp redirect exclude in command is not required on the interface connecting to the WAE.

Hardware-Based Platforms

In addition to running WCCPv2 on software-based IOS platforms such as the Cisco

Integrated Services Router (ISR), WCCPv2 is supported on Cisco Catalyst Series switches.

At the time of this writing, the Cisco Catalyst Series switches listed in Table 4-3 support

WCCPv2 for use with Cisco WAAS.

With the exception of the Catalyst 6500 with a Sup720, the hardware-based platforms

require L2 forwarding and mask assignment for all of the redirection to happen in

hardware. The Sup720 is capable of performing GRE forwarding in hardware, but still

requires mask assignment for hardware acceleration. In addition to the requirements for

forwarding and assignment methods, only inbound WCCPv2 redirection should be used on

hardware-based platforms. In fact, the Catalyst 3560/3750 and 4500/4900 only support

inbound redirection. While it is possible to conﬁgure outbound redirection on the Catalyst

6500 platform, it is not recommended because it causes the ﬁrst packet for every redirected

connection to be processed in software by the MSFC. Likewise, using the ip wccp redirect

exclude in command on a Catalyst 6500 causes the ﬁrst packet for every ﬂow entering

the interface to be processed by the MSFC and switched in software. However, because

inbound redirection is the recommendation for hardware-based platforms, this command is

not required.

The following conﬁguration guidelines should be followed to ensure WCCPv2 redirection

on hardware-based platforms is handled completely in hardware:

• Use L2 forwarding instead of GRE forwarding.

• Always use mask assignment.

• Only use inbound redirection.

• Do not use the ip wccp redirect exclude in command.

Table 4-3 Cisco Catalyst Platforms Supporting WCCPv2 with WAAS

Catalyst 3560/3750

Catalyst 4500/4900

Catalyst 6500, Sup2

Catalyst 6500, Sup32

Catalyst 6500, Sup720

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