TNETX15VE datasheet(53/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

tag field (continued)

The intent of the tag field is to allow each TNETX15VE and TNETX3150/TNETX3150A combination in a

cascaded situation through port 00 to know the sourcing port on the other side of the cascade connection. With

this visibility, VLANs can be enforced with stations on both sides of the cascade connection. The pretag field

also can be used to support VLANs if a TNETX15VE/TNETX3150/TNETX3150A combination is functioning as

an edge device through port 00 for other equipment. By putting a tag in front of the packet, the TNETX15VE

gets a VLANID from a table indexed by the tag field. The TNETX3150/TNETX3150A is responsible for

recovering the pretag and including it in the first block transfer for a packet being written to memory during cycle

0. The tag field is used only by TNETX15VE if the channel code is 00. Interpretation of the tag is shown in

Table 2.

Table 2. Source Port Number Codes

SOURCE

PORT NUMBER

PORT

0000

Reserved

0001

Port 01 (10/100 Mbit/s)

0010

Port 02 (10/100 Mbit/s)

0011

Port 03 (10 Mbit/s)

0100

Port 04 (10 Mbit/s)

0101

Port 05 (10 Mbit/s)

0110

Port 06 (10 Mbit/s)

0111

Port 07 (10 Mbit/s)

1000

Port 08 (10 Mbit/s)

1001

Port 09 (10 Mbit/s)

1010

Port 10 (10 Mbit/s)

1011

Port 11 (10 Mbit/s)

1100

Port 12 (10 Mbit/s)

1101

Port 13 (10 Mbit/s)

1110

Port 14 (10 Mbit/s)

1111

Reserved

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