# How EVC and BDI work?

**URL:** <https://forum.networklessons.com/t/how-evc-and-bdi-work/6556>\
**Category:** MPLS\
**Created:** [March 18, 2019, 8:56pm UTC](https://forum.networklessons.com/t/how-evc-and-bdi-work/6556 "2019-03-18T20:56:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rehabzenati](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/r/b5e925/32.png) [@rehabzenati](https://forum.networklessons.com/u/rehabzenati)\
**Post date:** [March 18, 2019, 8:56pm UTC](https://forum.networklessons.com/t/how-evc-and-bdi-work/6556/1 "2019-03-18T20:56:57Z")

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Hi Rene,  
I currently work as a support for a company that applies an Ethernet Virtual Connection, BDI, and QinQ tunneling  
I am only a CCNA level but I must understand these technologies  
Could you please guide me to what should I study and what to start with?

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**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\
**Post date:** [March 28, 2019, 1:51pm UTC](https://forum.networklessons.com/t/how-evc-and-bdi-work/6556/2 "2019-03-28T13:51:32Z")

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Hello Rehab,

I have some material that might help to understand these topics. First, I would make sure you become very familiar with VLANs and trunking. Go through unit 2 of the switching course:

> **[Switching - NetworkLessons.com](https://networklessons.com/switching)**
>
> This networklessons.com course covers all basic and advanced switching topics on Cisco IOS Catalyst switches.

Afterwards, read up on Metro Ethernet:

> **[Introduction to Metro Ethernet](https://networklessons.com/wide-area-network/introduction-to-metro-ethernet)**
>
> This lesson explains the basics of Metro Ethernet and topologies like the E-Line, E-LAN, VPWS, VPLS, and more.

And try the Q-in-Q configuration example:

> **[802.1Q Tunneling (Q-in-Q) Configuration](https://networklessons.com/switching/802-1q-tunneling-q-q-configuration-example)**
>
> This lesson explains how 802.1Q tunneling works and how to configure it on Cisco IOS Catalyst Switches.

I don’t have anything on BDI but @lagapidis explained it a bit in this topic:

> [@BDI interface](https://forum.networklessons.com/t/bdi-interface/4516/5):
>
> Hi Rene Kindly can you make one Lab on BDI and service instance , i can’t truely understand the concept after searching on internet .will be thankful

Good luck and if you have any questions, let us know ok?

Rene

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<div class="post-metadata">

**Author:** ![rehabzenati](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/r/b5e925/32.png) [@rehabzenati](https://forum.networklessons.com/u/rehabzenati)\
**Post date:** [April 1, 2019, 9:31am UTC](https://forum.networklessons.com/t/how-evc-and-bdi-work/6556/3 "2019-04-01T09:31:02Z")

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> [@ReneMolenaar](#):
>
> material

Thank you for answering me with a very useful information! Appreciate it.  
It has really helped me understand these topics

I was wondering if you have any material about **service instance**  
I would be grateful

Thanks,

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**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\
**Post date:** [April 3, 2019, 7:37am UTC](https://forum.networklessons.com/t/how-evc-and-bdi-work/6556/4 "2019-04-03T07:37:59Z")

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Hi Rehab,

I’m afraid not. I think it might be wise to check some of the [Cisco.com](http://Cisco.com) material on EVCs. For example:

> **[ethernet\_virtual\_connection.pdf](https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ethernet_virtual_connection.pdf)**
>
> 120.01 KB

Rene