VSC7511 datasheet(76/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

•

Key: MAC_ETYPE, MAC_LLC, MAC_SNAP, ARP, IP4_OTHER, IP4_TCP_UDP, IP6_STD,

IP6_OTHER, IP6_TCP_UDP, OAM, CUSTOM, depending on frame type

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Entry: Access Control Entry

•

Security enforcement, second lookup

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VCAP: IS2

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Key: MAC_ETYPE, MAC_LLC, MAC_SNAP, ARP, IP4_OTHER, IP4_TCP_UDP, IP6_STD,

IP6_OTHER, IP6_TCP_UDP, OAM, CUSTOM, depending on frame type

•

Entry: Access Control Entry

The egress lookup per destination port and associated VCAP is:

•

Egress tagging and frame manipulations

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VCAP: ES0

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Key: ES0

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Entry: Egress Control Entry

The IP source guarding check is only carried out for IP frames.

CPU injected frames are subject to all the above VCAP lookups in IS1, IS2, and ES0.

With respect to IS1 and IS2, each frame is classified to one of seven overall VCAP frame types. The

frame type determines the information to extract from the frame and also which VCAP entries to match

against. The following table lists which frame types are used and which VCAP entries the frame types

are matched against in IS1 and IS2. Note The lookup in ES0 is independent of the frame type, and all

frames match against all entries in the TCAM.

Table 33 •

IS1 and IS2 VCAP Frame Types

Frame Type

Condition

IS1 Entries

IS2 Entries

IPv6 Frame

The Type/Len field is equal to 0x86DD.

The IP version is 6.

Special IPv6 frames:

•IPv6 TCP frame: Next header is TCP (0x6)

•IPv6 UDP frame: Next header is UDP

(0x11)

•IPv6 Other frame: Next header is neither

TCP nor UDP

Frame type flags:

ETYPE_LEN = 1

IP_SNAP = 1

IP4 = 0

TCP_UDP

TCP

IP6_TCP_UDP

IP6_OTHER

IP6_STD

IPv4 Frame

The Type/Len field is equal to 0x800.

The IP version is 4.

Special IPv4 frames:

•IPv4 TCP frame: IP protocol is TCP (0x6)

•IPv4 UDP frame: IP protocol is UDP (0x11)

•IPv4 Other frame: IP protocol is neither TCP

nor UDP

Frame type flags:

ETYPE_LEN = 1

IP_SNAP = 1

IP4 = 1

TCP_UDP

TCP

IP4_TCP_UDP

IP4_OTHER

(R)ARP Frame The Type/Len field is equal to 0x0806 (ARP)

or 0x8035 (RARP).

Frame type flags:

ETYPE_LEN = 1

IP_SNAP = 0

ARP

OAM Frame

The Type/Len field is equal to 0x8902,

0x8809, or 0x88EE.

In particular, the following protocol data units

use this EtherType:

•IEEE 802.1ag (CFM)

•IEEE 802.3 (EFM)

•ITU-T Y.1731 (ETH-OAM)

•MEF-16 (E-LMI)

Frame type flags:

ETYPE_LEN = 1

IP_SNAP = 0

OAM

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