The recommended approach is to create a port channel and Q trunk the 4 physical ports together.
take a look at the following URL.
http://www.cisco.com/en/US/prod/collateral/contnetw/ps5719/ps7027/ps8361/guide_c07-572616_ps7027_Products_White_Paper.html
Physical Topology
To increase application and infrastructure availability, the Cisco ACE 4710 appliance takes advantage of all four Gigabit Ethernet interfaces and Cisco ACE virtualization. These interfaces can be configured in a PortChannel to create a single logical link between the Cisco ACE 4710 and Cisco Catalyst 6500 Series Switches. Trunked VLANs can be used to carry all client and server messaging, management traffic, and fault-tolerant communication.
Connecting the Cisco ACE 4710 to a Cisco Catalyst 6500 Series Switch in this manner has several obvious advantages:
• It allows the creation of a single very high-bandwidth logical link, helping ensure the highest level (4 Gbps) of throughput possible on the Cisco ACE 4710 appliance.
• It gracefully handles asymmetric traffic profiles typical of web architectures.
• It simplifies the interface configuration since the single PortChannel and IEEE 802.1q trunk need only be configured once and applied to each physical interface.
• Future upgrades, for example from 1 Gbps to 4 Gbps, can be accomplished in real time by installing a license for increased throughput without the need to physically recable the appliance interfaces.
• Individual Cisco ACE contexts are not limited by the throughput of a single 1-Gbps interface. Traffic can be shaped according to the available throughput at the context, virtual-IP, or real-server level rather than at the interface level.
• It allows the Cisco ACE to reach throughput license limits, including throughput limits additionally reserved for management traffic. By default, the entry-level Cisco ACE appliance has a 1-Gbps through-traffic bandwidth limit and an additional 1-Gbps management-traffic bandwidth limit, resulting in a maximum bandwidth of 2 Gbps. Similarly, with the 2-Gbps license, the Cisco ACE has a 2-Gbps through-traffic bandwidth limit
and a 1-Gbps management-traffic bandwidth limit, for a total maximum bandwidth of 3 Gbps.
• The PortChannel provides redundancy should any of the four physical interfaces fail.
• The single logical link can support all the common deployment modes, including routed, bridged, one-arm, and asymmetric server return, while also addressing high availability and stateful connection replication without problems.
Thanks
Eric
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