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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

161

3.21.1

VCAP IS2

Each frame is classified to one of nine overall VCAP IS2 frame types. The frame type determines which

VCAP IS2 key types are applicable and controls which frame data to extract.

Some protocols of interest do not have their own frame type but are included in other mentioned frame

types. For instance, Precision Time Protocol (PTP) frames are handled by VCAP IS2 as either ETYPE

frames, IPv4 frames, or IPv6 frames. The following encapsulations of PTP frames are supported:

•

PTP over Ethernet: ETYPE frame with Type/Len = 0x88F7.

•

PTP over UDP over IPv4: IPv4 UDP frame with UDP destination port numbers 319 or 320.

•

PTP over UDP over IPv6: IPv6 UDP frame with UDP destination port numbers 319 or 320.

Table 98 •

VCAP IS2 Frame Types

Frame Type

Condition

IPv6 multicast frame

The Type/Len field is equal to 0x86DD.

The IP version is 6.

The destination IP address is a multicast address (FF00::/8).

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.

IPv6 unicast frame

The Type/Len field is equal to 0x86DD.

The IP version is 6.

The destination IP address is not a multicast address.

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

IPv4 multicast frame

The Type/Len field is equal to 0x800.

The IP version is 4.

The destination IP address is a multicast address (224.0.0.0/4).

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.

IPv4 unicast frame

The Type/Len field is equal to 0x800.

The IP version is 4.

The destination IP address is not a multicast address.

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.

(R)ARP frame

The Type/Len field is equal to 0x0806 (ARP) or 0x8035 (RARP).

OAM Y.1731 frame

The Type/Len field is equal to 0x8902 (ITU-T Y.1731).

SNAP frame

The Type/Len field is less than 0x600.

The Destination Service Access Point field, DSAP is equal to 0xAA.

The Source Service Access Point field, SSAP is equal to 0xAA.

The Control field is equal to 0x3.

LLC frame

The Type/Len field is less than 0x600

The LLC header does not indicate a SNAP frame.

ETYPE frame

The Type/Len field is greater than or equal to 0x600, and the Type field

does not indicate any of the previously mentioned frame types, that is,

ARP, RARP, OAM, IPv4, or IPv6.

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