Cisco Wide Area Application Engine 612 Manual de usuario descargar pdf (Pagina 36)

110 Chapter 4: Network Integration and Interception

• Support for up to 250 virtual partitions, allowing customers to create virtual ACE

modules using a single hardware module

• Up to 16,000 real servers, which when used with Cisco WAAS provides nearly inﬁnite

scalability

• High availability and scalability by using up to four ACE modules in the same

Catalyst 6500 chassis or across multiple chassis

There are two common deployment models for integrating ACE into the network

infrastructure: bridge mode and routed mode.

In bridge mode, ACE is used to merge two VLANs together. In order for trafﬁc to pass

between the two VLANs, it must pass through the ACE module. As trafﬁc passes through

the ACE module, it is evaluated against the conﬁgured service policies to determine whether

or not it should be acted upon. The IP subnet used on the bridged VLAN is the same.

Figure 4-16 shows an ACE module deployed using bridge mode.

Figure 4-16 ACE Deployed Using Bridge Mode

The WAN-facing VLAN in Figure 4-16 is referred to as the client-side VLAN. The VLAN

facing the data center resources is referred to as the server-side VLAN. As trafﬁc enters the

client-side VLAN, it is evaluated against the conﬁgured service policy. Trafﬁc matching the

service policy is redirected to a WAE, which has a dedicated VLAN interface conﬁgured on

the ACE module. Trafﬁc egressing the WAE comes back into the ACE module, where it is

switched out the server-side VLAN toward the origin server.

In contrast to bridge mode, deploying ACE in routed mode allows for trafﬁc to be routed

between two different IP subnets. Using this deployment model, the client and server-side

VLANs are on different IP subnets. Because the ACE module is a Layer 3 hop, trafﬁc must

be directed to the ACE module through the routing conﬁguration of the hosts or network

infrastructure. Figure 4-17 shows an ACE module deployed using routed mode.

WAN

VLAN 10

10.10.10.0/24

Server Default Gateway

VLAN 20

10.10.10.0/24

Cisco ACE

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Cisco Wide Area Application Engine 612 Manual de usuario Pagina 36