Vlans and seting them up

pts.
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Cisco 3750
VLAN
VLAN hardware
new to Vlans with Cisco have a 3750 switch and want to Vlan ports 1-12 for the servers and the backup drives still need for the PCs to connect to the servers. Q 1 in the VLAN would you have to subnet this out one for the network and one for the servers? Q 2 how do do you get the seperate Vlans to talk to each other when needed. basiclaly just trying to make a seperate collision domain.

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I think you need to be clearer on your requirements.

By definition, a switch automatically creates separate collision domains for each physical port (assuming that there are multiple systems connected to a given port). So if that’s all you want to do, just leave the switch in its default state (VLAN1 is everywhere).

Bear in mind that the purpose of VLANs is two-fold:
1) To create a virtual LAN that spans multiple network devices, and by extension the systems connected to them. These can be geographically separated.
2) To create multiple LANs within a single device which have no logical connection.
3) Combinations of the two above.

With that in mind, write back and let us know just what it is that you want to accomplish.

Bob

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  • Devang
    hello, when ever you want to have security and large broadcast domain then you should creat vlan. you can put the different department user in their appropriat vlan so u can reduce the broadcast and can also provide the security for the vlans. other thing as different vlan can not communicate with each other directly so u need to have the Layer-3 device likeROUTER i dont know your switch is L3 or not if your switch is L3 then you can do the intervlan routing so different vlan can communicate and also provide the fileration of unwanted traffic in perticular valn from other vlan. thanking you devang patel
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  • Burmuse
    Answer 1. Yes, you have to have separate layer 3 subnet for each layer 2 vlan of the switch in order to communicate between them. Assuming you only have one switch in your network, you have to configure both layer 2 vlan configuration and layer-3 logical vlan configuration in your switch. Answer 2. As I mentioned in Answer #1, You have to configure "int vlan" configuration like this: =============================== Sample vlan config (layer-3) =============================== int vlan100 ip address 192.168.100.1 255.255.255.0 description "your remark about this vlan in here." no shutdown exit int vlan200 ip address 192.168.200.1 255.255.255.0 description "your remark about this vlan in here." no shutdown exit ====================== end of sample config ====================== Vlan is to separate broadcast domain, not for collision domain which is separated by switch. (i.e. If you upgrade from hub to unmanaged switch, you have already made separate collision domain for each device.) Vlan configuration is only available in managed switches. (Not from Netgear 5 ports switch.)
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  • Richl01
    okay think I got it working right have a vlan 2 that is subnetted out for our ISCSI SAN so all SAN traffic is seperated out and then have the normal VLAN 1 for regular traffic. all the servers second NIC connected to VLAN 2 and VLAN 1 stays the same. thanks for all the input
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  • Ajay42usa
    Cisco web site has tons of details on configuring switches for various configurations with clear examples and configuration commands. -Ajay
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