Creating VLan. .

[jasonsaw]

Hi all ..

i am new in creating VLAN .. and i need help =) hope u guys can lend me a hand ..

i am setting up VLan in a new network in my company .. i have 2 3com superstack 3 4400 se switches and 2 baseline 10/100 switch . . how can i segment my office's network into 3 different department which consist of 30-40 computers in each segment ??

how do tag and untag works ? anyway .. any good sites for VLAN tutorial ?

thanx !

 

[TimRegester]

Tagging using 802.1q is explained in the manuals for the 4400SEs so RTFM and all will be revealed. There are online courses in 3Com University as well.

Put simply a tagged frame has a tag that states it is destined for or from a particular VLAN. This tag is added by a VLAN aware switch or even a network card. The 4400s understand VLANS and the 802.1q standard the Baseline switches do not. The Baselines need to hang off an untagged port not a tagged port. This untagged port need to particapate in a VLAN to make all devices hanging off the baseline switch members of that VLAN.

Create three new VLANs on one of the 4400s. Set up a trunk using 802.1q to the second 4400, this will allow all ports on the second 4400 to join any VLAN.

The baselines do not participate in 802.1q so you need to hang one off a port on a 4400 set for one of the VLANs and do the same for the other Baseline on another VLAN. The third VLAN will need to use spare ports on the 4400s which can sit in any VLAN

A simple solution (with no resilience via Spanning Tree) gives you 3 discreet VLANs as in

(trunk as 802.1q tagged)
4400se=================4400se
| | | |
| |VLAN A | |VLAN B
| | | |
| Baseline #1 | Baseline #2
| | | |
PCs in | PCs in |
VLANs A | VLANs A |
B or C | B or C |
| |
PCs in VLAN A PCs in VLAN B

VLANs are usually mapped to IP subnets one for each VLAN, if these VLANs share common services such as a server or internet connection, you will need some form of layer 3 device either a router or switch to route between the VLAN/subnets. This Layer 3 device could be connected via an 802.1q trunk to one of the 4400s or three connections (one in each VLAN)

If possible make the trunks and links between the 4400s and the Baseline switches gigabit or at least aggregated Fast Ethernet, to minimise bottlenecks.

 

[kipcc]

Howdy, I am also kinda new to vlan. Currently, I am testing with my 4250T model. I created vlan2 on one of the 48 ports. It went ok, but I wonder what do I do with it? It now can't see any servers (makes sense), however, it can't access the Internet even with static IP (same subnet as the firewall). What I intended was to create a computer lab seperates from the main lan, but still able to utilize internet connection. Any has any suggestion? Thanks.