TNETX4080 datasheet(42/64 Pages) TI1

42 / 64 page

TNETX4080

ThunderSWITCH II™ 8-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS050A – AUGUST 1998 – REVISED NOVEMBER 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Mirr

Bit = 1?

Remove:

– Disabled Ports

– Ports Blocked by TxBlockPorts

From Port Routing Code

Yes

[(Source Port = MirrorPort or

Port Routing Code Includes MirrorPort)

and (Source Port ! = UplinkPort)]

Then

Include UplinkPort in Port Routing Code

Lshare = 1?

Port Routing Code

is Adjusted by

Trunking Algorithm

(see Note A)

Destination

Found?

Yes

Port Routing Code

is Adjusted by

Load-Sharing

Algorithm

(see Note A)

Yes

NOTE: See

Port Trunking/Load Sharing

Port Routing

Code = 0?

Send Frame to

Ports Indicated by

Port Routing Code

Yes

Discard

Frame

Figure 7. Frame-Routing Algorithm (Continued)

port routing code

The IALE creates a port routing code in which each bit (marked with a 1) represents a potential destination port

for the frame. This code is modified as it proceeds through the frame-routing algorithm. If the final code is all

0s, then the frame is discarded. If it is not, then the frame is transmitted on every port marked by a 1 within the

code.

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