Inter-VLAN Routing with a Layer 3 Switch

[@isLife-if8lz]

Very helpful! Thank you! I'm not a networking guy but I was trying to interconnect the VLANs on our stack and this solves it!

[@ddaltonyvcc]

I'm glad I could be helpful.

[@anoopmohamed]

Hi David, Thanks for the video. Can you please explain if there are two layer 3 switches connected to each other having redundancy and each these layer 3 switches are connected to other layer 2 switches with redundant connection to both these layer 3 switches. So if layer 3 is down, still communication need to take place (including intervlan routing). Then how and where will be configuring the gateway for these vlans as both layer 3 switches are in used for redundancy (please note they are not stacked). Thankyou

[@ddaltonyvcc]

You would need to use a first hop redundancy protocol like HSRP or GLBP. Check the video on HSRP (kzbin.info/www/bejne/eH6tmZWtfriCqqs) to get an idea of how it works. The video demonstrates it using Cisco routers but you can do the same thing with the layer 3 switches VLAN interfaces.

[@amanch5743]

Thanks Sir .........This video is very helpful for me

[@ddaltonyvcc]

Glad it was helpful.

[@S197Bryan]

Your videos are amazing. Their helping me understand my ccna studies much better. One thing I’m lost about here is, can the layer 3 switch be the dhcp server or will the firewall/router still be the dhcp server?

[@ddaltonyvcc]

I'm glad they are helpful. A layer 3 switch can be a DHCP server if needed. On a live network I prefer to use a server as the DHCP server rather than the layer 3 switch, router, or firewall, but it can work in a pinch.

[@S197Bryan]

@@ddaltonyvcc so in that case the server handles dhcp, the layer 3 handles inter network routing and I would make dns four 1s. The firewall inspects traffic going in and out of the network and the router just handles routing externally? Is that the best practice?

[@joejoe2452]

How can you stop intervlan routing on layer 3 switch? Say theres 4 vlans. Vlan 10,vlan 20,vlan 30,vlan 40. You want all vlan to access vlan 10 only and all vlans cant talk with other vlans?

[@ddaltonyvcc]

You wouldn't stop routing, you would want to block traffic with an access control list.

[@joejoe2452]

@@ddaltonyvcc thanks i didn’t know that… looking for a video now with how to set that up

[@ddaltonyvcc]

@@joejoe2452, there are videos on this channel that illustrate how to setup ACLs. It is the same process on a layer 3 switch as it is on a router.

[@joejoe2452]

@@ddaltonyvcc thanks i will find it