Troubleshooting guide

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Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring Traffic Interception
Information About Interception Methods
to a local WAE can be a router using WCCP Version 2 or PBR to redirect traffic to the local WAE or a
Layer 4 to Layer 7 switch (for example, the Catalyst 6500 series Content Switching Module [CSM] or
Application Control Engine [ACE]). Alternately, you can intercept traffic directly by using the inline
mode with a WAE that has a Cisco WAE Inline Network Adapter or Interface Module. When equipped
with a Cisco AppNav Controller Interface Module, a WAVE appliance or cluster can intercept network
traffic through WCCP or inline mode and, based on flow policies, distribute that traffic to one or more
WAEs (WAAS nodes) for optimization.
Table 1-1 summarizes the transparent traffic interception methods that are supported in your WAAS
network.
Table 1-1 Supported Methods of Transparent Traffic Interception
Method Comment
WCCP
Version 2
Used for transparent interception of application traffic and Common Internet File
System (CIFS) traffic. Used in branch offices and data centers to transparently redirect
traffic to the WAAS devices. The traffic is transparently intercepted and redirected to
the local WAE or ANC by a WCCP-enabled router or a Layer 3 switch.
You must configure WCCP on the router and WAE in the branch office and the router
and WAE in the data center. For more information, see the following sections:
• Information About WCCP Interception, page 1-3
• Configuring Advanced WCCP Features on Routers, page 1-6
• Configuring WCCP on WAEs, page 1-11
PBR
In branch offices, used for wide area application optimization. The branch office
router is configured to use PBR to transparently intercept and route both client and
server traffic to the WAE that resides in the same branch office.
In data centers, used for data center application optimization. The data center router
or Layer 3 switch may be configured to use PBR to transparently intercept and route
client and server traffic to WAEs within the data center. PBR, however, does not
support load balancing across multiple WAEs (such as WCCP does). Neither does it
support load balancing when you are using a hardware load balancer, such as the Cisco
CSM or ACE. See the “Using Policy-Based Routing Interception” section on
page 1-33.
Inline
The WAE physically and transparently intercepts traffic between the clients and the
router. To use this mode, you must use a WAAS device with the Cisco WAE Inline
Network Adapter, Cisco Interface Module, or Cisco AppNav Controller Interface
Module installed. See the “Using Inline Mode Interception” section on page 1-42.
VPATH
Used for VPATH interception on vWAAS devices. See the “Configuring VPATH
Interception on a vWAAS Device” section on page 1-55.
AppNav
Controller
For WAEs that are part of an AppNav deployment and are configured as WAAS nodes
in an AppNav Cluster, you must configure them to use the appnav-controller
interception method. This configuration allows WAEs to receive and optimize traffic
that is intercepted and distributed by the AppNav Controllers. See the “Configuring
AppNav Interception” section on page 1-56.
ACE or CSM
Cisco Application Control Engine (ACE) or Catalyst 6500 series Content Switching
Module (CSM) installed in the data center for data center application optimization.
The ACE or CSM allows for both traffic interception and load balancing across
multiple WAEs within the data center.