Advantage and disadvantage among different method using in InterVLAN

[zeroleeorez]

Which of the following is the fastest

1, without Router on a stick, use a Router to connect each VLAN with a line

2. Router on a stick

3. Sub interface support by multilayer switch

4. EIGRP

[Joseph W. Doherty]

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Posting

From a L3 forwarding perspective, where the VLAN (subnet) forwarding decision can be made on the L3 device, multilayer L3 switches usually are the fastest.  BTW, mutltilayer switches normally used virtual interfaces and physical VLAN trunks working with VLANs, not subinterfaces as seen on a more traditional router.

EIGRP, as a routing protocol, really only impacts L3 forwarding performance when you start to deal with L3 topologies, not so much for inter-VLAN (subnet) routing.

[singhaam007]

Hi Ho,

Its really depends on your business and there needs. if you can spend some money then L 3 switches are good. But if the budget is really tight then router on stick will work.

1. With router to connect each vlan you doubling, the hardware cost because you need to get router for each vlan. As you business grow then your network will get more complicated.
   
2. Router on stick is good but one big disadvantage is single point of failure and your whole network will go down if router crash. It will also bottle neck the router interface because traffic need to go through router each time.
   
3. Sub interfaces on layer 3 switches are good because the traffic will be routed through the same switch and asic will take care of it. You need to create vlan interface for each vlan . Make sure you enable ip routing.
   
4. eigrp is an routing protocol and will work with L3 topology . On layer 3 switch you can use ports for routing as well. Just enter no switchport and that port will part in routing.
   

Hope this will help.

Please rate if this information helps.

thanks