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Network Integration and Interception

Chapter Description

This chapter provides an in-depth review of the network integration and interception capabilities of Cisco WAAS.

Network Integration Best Practices

The following network integration best practices are recommended for most WAAS deployments:

  • Leave the physical WAE interfaces set to auto-sense: Because it is possible that some of your WAEs will be able to run at 1-Gbps speed, leaving all of the WAEs deployed set to auto-sense simplifies the configuration and deployment. In addition, an alarm will be raised in the Central Manager if an interface negotiates to half duplex.
  • Use EtherChannel for interface redundancy when both physical WAE interfaces connect to the same LAN switch: Improve performance by providing 2X the available LAN bandwidth.
  • Use a standby interface for interface redundancy when both physical WAE interfaces connect to different LAN switches: Increase WAE availability in the event of a problem with the primary interface or connected LAN switch.
  • Always configure a MD5 password for WCCP service groups: Protect the integrity of the service group members by making sure that only authorized devices can join the service group.
  • Stick to inbound WCCP redirection: Even on software-based platforms, inbound redirection is more efficient.
  • On hardware-based platforms, configure WCCP using the following guidelines:
    • — 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.
  • Only use the GRE return EMIC on software-based platforms (i.e. ISR routers): Hardware-based platforms process GRE return traffic completely in software, which causes serious performance issues.
  • Run a recommended version of IOS for WCCP: Tables 4-5 and 4-6 list the minimum recommended IOS versions when running WCCP with Cisco WAAS.

Table 4-5. Minimum IOS Recommendations: Software-Based Platforms

Major Version

M Train

T Train

12.1

12.1(14)

12.1(3)T

12.2

12.2(26)

12.2(14)T

12.3

12.3(13)

12.3(14)T5

12.4

12.4(10)

12.4(9)T1

Table 4-6. Minimum IOS Recommendations: Hardware-based Platforms

Platform

Version

Catalyst 3560/3750

12.2(37)SE

Catalyst 4500/4900

12.2(31)SG

Catalyst 6500, Sup2

12.2(18)SXF13

Catalyst 6500, Sup32

CatOS 8.5/12.2(18)SXF13

Catalyst 6500, Sup720 (Native)

12.2(18)SXF13

Catalyst 6500, Sup720 (Hybrid)

CatOS 8.5/12.2(18)SXF13