Cisco Wide Area Application Engine 612 Instrukcja Użytkownika Pobierz pdf (Strona 12)

86 Chapter 4: Network Integration and Interception

In this output, the only indication that the interface is a member of a standby group is the

secondary IP address, which matches the IP address conﬁgured on the virtual standby

interface.

Interception Techniques and Protocols

There are two approaches for leveraging the network infrastructure to intercept and redirect

trafﬁc to WAAS for optimization. The ﬁrst method relies on interception protocols or rout-

ing conﬁguration used by the networking components (routers and switches) to selectively

intercept trafﬁc and redirect it to the WAAS infrastructure. This method is referred to as

off-path interception. The most common method for off-path network interception is the

Web Cache Communication Protocol, or WCCPv2.

The second method places the WAE physically inline between two network elements, most

commonly a router and LAN switch. All trafﬁc between the two network elements is passed

through the WAE, which can then selectively intercept trafﬁc for optimization. This method

is referred to as in-path interception, because the WAE is physically placed in the data path

between the clients and servers.

This section discusses both off-path (WCCPv2) and in-path interception in detail. It also

discusses other interception options for speciﬁc use cases, such as policy-based routing

(PBR) and content switching. These additional interception options add to the ﬂexibility

with which WAAS can be integrated into existing network infrastructures of all sizes.

Web Cache Communication Protocol

This section does not provide an exhaustive reference for the WCCPv2 protocol. Rather, it

provides enough information about the protocol background and concepts to enable you to

understand the WCCPv2 implementation in Cisco WAAS. For an in-depth understanding

Input Packets Overruns: 0

Input Packets Frames: 0

Packet Sent: 0

Output Errors: 0

Output Packets Dropped: 0

Output Packets Overruns: 0

Output Packets Carrier: 0

Output Queue Length:1000

Collisions: 0

Base address:0x3400

Flags:UP BROADCAST MULTICAST

Mode: autoselect

AST6-CCO-01#

Example 4-8 Standby Group Member Interface Output (Continued)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 40 41

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