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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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VSC7511 데이터시트(PDF) 75 Page - Microsemi Corporation |
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VSC7511 데이터시트(HTML) 75 Page - Microsemi Corporation |
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75 / 324 page  Functional Descriptions VMDS-10488 VSC7511 Datasheet Revision 4.2 60 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 N-1 N-2 N-3 N-4 0 ... Default Actions Action Entry Entry Data Entry Mask . . . . . . . . . . . . . . |
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