Configure Inter-VLAN Routing on Cisco Routers and Switches

[thesamhere]

which simulator can be downloaded free from net on which I can practice routing as well as switching both? please help me out....

[2007Russdog]

Can you have interVlan communications with a router in your topology?

[Keith6783]

@2007Russdog

Yes, as long each VLAN has a routed interface in it (The router, a switch virtual interface, etc) and that routing device knows how to reach all the networks (directly connected, or static routes, or dynamic routes or default routes) and as long as the other routers in the topology also know how to reach all the networks, then yes, InterVLAN (between VLAN) communication and local communication on the same VLANs is possible too.

Best wishes,

Keith

[2007Russdog]

@Keith6783

I guess that I meant to ask "Can you have inter Vlan communication without a router of a layer 3 switch?" Because I configured a switch and pc network and I cant get anything to communicate outside their vlans" Is that correct?

[Spenc083]

Great break down and very easy to understand.

[hollywood0770]

Hi Keith, I'm just loving your videos, they are so well explained in such an easy-to-understand language. Text books dind't help me understnad many concepts, but your vids make things crystal clear.

many thx

[Keith6783]

@hollywood0770

You are very welcome. Thanks for the post.

Best wishes,

Keith

[lowdown2010]

1 question when I try to enter the switchport trunk encapsulation dot1q it gives me a error can you please advise on what I may e doing wrong

[Keith6783]

@lowdown2010

If you are on a switch, that only supports dot1q, (for example it doesn't support the older ISL), then it may just default to dot1q for trunking. That may be one reason, as the command may not exist or be needed on the switch.

Keith

[varunsharma23]

gr8 vid ... a very step by step porcess

[Keith6783]

@varunsharma23

Thanks for your comments.

Best wishes,

Keith

[TheVineet1990]

hey keith

thanks for this informative video..could u please upload a video for pat translation with multiple vlans on local network.thanks in advance.

[Dradik27]

I came here to watch a video on VLANs. Next thing you know I am backing up and re-watching your magic trick.

Great videos Keith you are an enormous help!

[d3f4c3d]

dude ur hair all white - u must have been long in IT...

u got ur ccie yet, if u need parther for lab study message me.

peace

[Keith6783]

@d3f4c3d

I got my first CCIE in 2001, and the second in 2003. I am CCIE #6783, (which is why my YouTube channel is Keith6783). As for the grey hair, I am old, and even have a grandchild.  :)

Best wishes, Keith.

[MrWrath86]

Gr8 video!..Thnx :)

[tfinder]

Great work!



[tivrfoa]

Very nice video. Thank you.

[vckkvck]

Good one

[iamuser]

thanks. very informative. even im drunk viewing this, i still managed to nail what you were saying. FTW~

[Ciscoice]

Great Video and easy to understand, keep up the great work!

[Keith6783]

@Ciscoice

Thanks for the positive feedback.

Best wishes,

Keith

[mounirorfi]

Hey Keith, thank you so much for the interface range tip !

[Keith6783]

@mounirorfi

Glad it is of use to you. Thanks for posting the comment!

Keith

[XSFlanger]

I actually remembered my fatal mistake when adding vlan through trunk and forgetting to type "add". Yeah... I had to travel to the other end of the city :)

Thanks for the vid :) Your contribution is really huge!

If its possible in future releases, I'd love to see some discussion about designing the L2 (optimizing MTU or maybe using other L2 technology ) for the least overhead or explaining overhead in more detail I'd say. Its strange that such a crucial aspect is usually ignored.

[CommanderBR]

Thank you Keith. I got 1 question for you, after reading a topic about ISL, dot1q and Routers.

In this example you didn't create any subInterfaces on the routers to allow different vlans from communicating to each other. That's because EACH of the Router's Interfaces are connected to only 1 vlan?

If there was only one connection between R4 and SW2, for example, then i would need to create subInterfaces?

thanks for your time!

[Keith6783]

@CommanderBR

If there was only a single physical interface from R4 to the switch, we could trunk to the router, and do router on a stick. Router on a stick would indeed use sub interfaces. I will do a follow up video, with this topology, to demonstrate that. Thanks for the idea.

[CommanderBR]

@Keith6783 Oh Great! Thank you very much for the help. The Official Exam Book from Cisco press - CCNA ICND2 2ed by Wendell Odom - has a small explanation about that but it isn't so clear and extensive. Thank you once again!!!

[Keith6783]

@CommanderBR

I created another video, with takes the current network from this video, and converts it to use a single router, trunking to that router, and sub interfaces on that router. The new video goes through it all, step by step. Let me know what you think of it.

Keith

[CommanderBR]

Nice video. Im studying for CCNA by myself and your videos are helping a lot. Keep them coming =)

[Keith6783]

@CommanderBR

Thanks for the kind words! Let me know if you have specific requests.

Keith

[spearhead010]

@Keith6783

Hi Keith, i need your help... i'm receiving this message in the two routers:

%DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 23.0.0.2 (FastEthernet0/0) is down: holding time expired

%DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 23.0.0.2 (FastEthernet0/0) is up: new adjacency

%DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 23.0.0.2 (FastEthernet0/0) is down: retry limit exceeded

as i tried to setup a configuration base on your example..

thanks in advance..