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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

3.8

VCAP

The VCAP is a content-aware packet processor for wire-speed packet inspection for rich implementation

of, for example, advanced VLAN and QoS classifications and manipulations, IP source guarding, and

security features for wireline and wireless applications.

The following describes three VCAPs implemented in the device: IS1, IS2, and ES0. IS1 and IS2 are

generic ingress VCAPs working on the incoming frames while ES0 is an egress VCAP working on all

outgoing frames.

When a VCAP is enabled, each frame is examined to determine the frame type (for example IPv4 TCP

frame) so that the frame information is extracted according to the frame type. Together with port-specific

configuration and classification results from the basic classification, the extracted frame information

makes up an entry key, which is passed to a TCAM and matched against entries in the TCAM.

An entry in the TCAM consists of a pattern and a mask, where the mask allows pattern-matching with the

use of “don’t cares”. The first matching entry is then used to select an action. The following illustration

provides a functional overview of a general TCAM.

Figure 23 •

VCAP Functional Overview

Each frame results in up to six ingress VCAP lookups and one egress lookup per destination port. The

lookups use different keys and the results determine the frame’s ingress classification, security handling,

and egress VLAN manipulation. The six ingress lookups and the associated VCAPs are:

•

Advanced ingress classification, first lookup:

•

VCAP: IS1

•

Key: IS1

•

Entry: IS1 Control Entry

•

Advanced ingress classification, second lookup:

•

VCAP: IS1

•

Key: IS1

•

Entry: IS1 Control Entry

•

Advanced ingress classification, third lookup:

•

VCAP: IS1

•

Key: IS1

•

Entry: IS1 Control Entry

•

IP source guarding check:

•

VCAP: IS2

•

Key: SMAC_SIP4 (IPv4 frames) or SMAC_SIP6 (IPv6 frames)

•

Entry: SMAC_SIP4 Control Entry or SMAC_SIP6 Control Entry

•

Security enforcement, first lookup:

•

VCAP: IS2

TCAM

RAM

N-1

N-2

N-3

N-4

...

Default Actions

Action

Entry

Entry Data

Entry Mask

. . . . . . . .

. . .

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