GS2210 Series User’s Guide
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H A P T E R
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MAC Table
48.1 MAC Table Overview
This chapt er int r oduces t he M AC Ta ble scr een.
The M AC Ta ble scr een ( a MAC t able is also know n as a filt er ing dat abase) show s how fram es are
for warded or filt er ed acr oss t he Swit ch’s por t s. I t show s w hat device MAC addr ess, belonging t o
w hat VLAN gr oup ( if any) is for war ded t o w hich por t ( s) and w het her t he MAC addr ess is dynam ic
( lear ned by t he Swit ch) or st at ic ( m anually ent er ed in t he St a t ic M AC For w a r din g scr een) .
48.1.1 What You Can Do
Use t he M AC Ta ble scr een (
) t o check w het her t he MAC addr ess is
dynam ic or st at ic.
48.1.2 What You Need to Know
The Swit ch uses t he MAC t able t o det er m ine how t o for war d fram es. See t he follow ing figur e.
1
The Sw it ch exam ines a r eceived fram e and lear ns t he por t on w hich t his sour ce MAC addr ess cam e.
2
The Swit ch checks t o see if t he fram e's dest inat ion MAC addr ess m at ches a sour ce MAC addr ess
alr eady lear ned in t he MAC t able.
•
I f t he Sw it ch has alr eady lear ned t he por t for t his MAC addr ess, t hen it for war ds t he fram e t o
t hat por t .
•
I f t he Sw it ch has not alr eady lear ned t he por t for t his MAC addr ess, t hen t he fram e is flooded t o
all por t s. Too m uch por t flooding leads t o net w or k congest ion.
•
I f t he Sw it ch has alr eady lear ned t he por t for t his MAC addr ess, but t he dest inat ion por t is t he
sam e as t he por t it cam e in on, t hen it filt er s t he fram e.
