Chapter 24 Multicast
GS2210 Series User’s Guide
192
The follow ing t able descr ibes t he labels in t his scr een.
Table 80
Advanced Applicat ion > Mult icast > I Pv4 Mult icast > I GMP Snooping
LABEL
DESCRIPTION
I GMP Snooping
Use t hese set t ings t o configur e I GMP snooping.
Act ive
Select Act ive t o enable I GMP Snooping t o forwar d group m ult icast t raffic only t o por t s
t hat are m em ber s of t hat gr oup.
Quer ier
Select t his opt ion t o allow t he Sw it ch t o send I GMP General Quer y m essages t o t he VLANs
w it h t he m ult icast host s at t ached.
Host Tim eout
Specify t he t im e ( fr om 1 t o 16 711 450) in seconds t hat elapses befor e t he Sw it ch
r em oves an I GMP gr oup m em ber ship ent ry if it does not r eceive r epor t m essages fr om
t he por t .
802.1p
Pr ior it y
Select a pr ior it y level ( 0- 7) t o w hich t he Sw it ch changes t he pr ior it y in out going I GMP
cont r ol packet s. Ot herw ise, select N o- Ch a n ge t o not r eplace t he pr ior it y.
I GMP Filt er ing
Select Act iv e t o enable I GMP filt er ing
t o cont r ol w hich I GMP gr oups a subscr iber on a por t
can j oin.
I f you enable I GMP filt er ing, you m ust cr eat e and assign I GMP filt er ing pr ofiles for t he
por t s t hat you want t o allow t o j oin m ult icast groups.
Unk now n
Mult icast Fram e
Specify t he act ion t o per for m w hen t he Sw it ch r eceives an unknow n m ult icast fram e.
Select D r op t o discar d t he fram e( s) . Select Floodin g t o send t he fram e( s) t o all por t s.
Reser ved
Mult icast Gr oup
The I P addr ess range of 224.0.0.0 t o 224.0.0.255 ar e reser ved for m ult icast ing on t he
local net w or k only. For ex am ple, 224.0.0.1 is for all host s on a local net w or k segm ent and
224.0.0.9 is used t o send RI P r out ing infor m at ion t o all RI P v 2 r out er s on t he sam e
net w or k segm ent . A m ult icast r out er w ill not for war d a packet w it h t he dest inat ion I P
addr ess w it hin t his range t o ot her net w or k s. See t he I ANA w eb sit e for m or e infor m at ion.
The layer- 2 m ult icast MAC addr esses used by Cisco layer- 2 pr ot ocols,
01: 00: 0C: CC: CC: CC and 01: 00: 0C: CC: CC: CD, ar e also included in t his gr oup.
Specify t he act ion t o per for m w hen t he Sw it ch r eceives a fram e w it h a r eser ved m ult icast
addr ess. Select D r op t o discar d t he fram e( s) . Select Floodin g t o send t he fram e( s) t o all
por t s.
Port
This field display s t he port num ber.
*
Set t ings in t his r ow apply t o all por t s.
Use t his r ow only if you want t o m ake som e set t ings t he sam e for all por t s. Use t his r ow
fir st t o set t he com m on set t ings and t hen m ake adj ust m ent s on a por t - by- por t basis.
Changes in t his r ow ar e copied t o all t he por t s as soon as you m ake t hem .
I m m ed. Leave
Select t his opt ion t o set t he Sw it ch t o r em ove t his por t fr om t he m ult icast t r ee w hen an
I GMP ver sion 2 leave m essage is r eceived on t his por t .
Select t his opt ion if t her e is only one host connect ed t o t his por t .
Nor m al Leave
Ent er an I GMP nor m al leave t im eout value ( from 200 t o 6,348,800) in m iliseconds. Select
t his opt ion t o have t he Sw it ch use t his t im eout t o updat e t he for war ding t able for t he por t .
I n norm al leave m ode, w hen t he Sw it ch r eceives an I GMP leave m essage from a host on a
por t , it for war ds t he m essage t o t he m ult icast r out er. The m ult icast r out er t hen sends out
an I GMP Gr oup- Specific Quer y ( GSQ) m essage t o det er m ine w het her ot her host s
connect ed t o t he por t should r em ain in t he specific m ult icast gr oup. The Sw it ch for wards
t he quer y m essage t o all host s connect ed t o t he por t and wait s for I GMP r epor t s from
host s t o updat e t he for war ding t able.
This defines how m any seconds t he Sw it ch wait s for an I GMP r epor t befor e r em ov ing an
I GMP snooping m em ber ship ent r y w hen an I GMP leave m essage is r eceived on t his por t
fr om a host .
