Chapter 9 VLAN
GS2210 Series User’s Guide
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9.7 Protocol Based VLANs
Pr ot ocol based VLANs allow you t o gr oup t raffic int o logical VLANs based on t he pr ot ocol you
specify. When an upst r eam fram e is received on a por t ( configur ed for a pr ot ocol based VLAN) , t he
Swit ch checks if a t ag is added alr eady and it s pr ot ocol. The unt agged packet s of t he sam e pr ot ocol
ar e t hen placed in t he sam e pr ot ocol based VLAN. One advant age of using pr ot ocol based VLANs is
t hat pr ior it y can be assigned t o t raffic of t he sam e pr ot ocol.
Not e: Pr ot ocol based VLAN applies t o un- t agged packet s and is applicable only w hen you
use I EEE 802.1Q t agged VLAN.
For exam ple, port 1, 2, 3 and 4 belong t o st at ic VLAN 100, and port 4, 5, 6, 7 belong t o st at ic VLAN
120. You configur e a pr ot ocol based VLAN A w it h pr ior it y 3 for ARP t raffic r eceived on por t 1, 2 and
3. You also have a pr ot ocol based VLAN B wit h pr ior it y 2 for Apple Talk t raffic r eceived on por t 6 and
7. All upst r eam ARP t raffic from por t 1, 2 and 3 w ill be gr ouped t oget her, and all upst r eam Apple
Talk t raffic fr om por t 6 and 7 w ill be in anot her gr oup and have higher pr ior it y t han ARP t raffic,
when t hey go t hr ough t he uplink por t t o a backbone swit ch C.
Figure 79
Pr ot ocol Based VLAN Applicat ion Exam ple
9.7.1 Configuring Protocol Based VLAN
Click t he Pr ot ocol Ba se d V LAN Se t u p link in t he V LAN Con figu r a t ion scr een t o display t he
configurat ion scr een as show n.
Act ive
This field show s w het her t he subnet based VLAN is act ive or not .
Nam e
This field show s t he nam e t he subnet based VLAN.
I P
This field show s t he I P addr ess of t he subnet for t his subnet based VLAN.
Mask- Bit s
This field show s t he subnet m ask in bit num ber for m at for t his subnet based VLAN.
VI D
This field show s t he VLAN I D of t he fram es w hich belong t o t his subnet based VLAN.
Pr ior it y
This field show s t he pr ior it y w hich is assigned t o fram es belonging t o t his subnet based VLAN.
Select an ent r y ’s check box t o select a specific ent r y. Ot her w ise, select t he check box in t he
t able heading r ow t o select all ent r ies.
Delet e
Click t his t o delet e t he subnet based VLANs w hich you m ar ked for delet ion.
Cancel
Click Ca n ce l t o clear t he check boxes.
Table 38
Adv anced Applicat ion > VLAN > VLAN Configur at ion > Subnet Based VLAN Set up
LABEL
DESCRIPTION