Design question / What would you recommend and why: L2 tunneling over L3

Created: Dec 1, 2015 16:47:23Latest reply: Dec 2, 2015 16:59:20 1449 3 0 0

Hi everyone

I value experience the most so I am asking you to share your experience.

I'm thinking about getting rid of L2 for switch interconnects in my network.

We are using 5720EI-Switches here and it is a small scale network (7 Switches). Right now we are using VLANs spanning all over and I don't like it very much. L2 is hard to control and in my opinion not designed to "span" that wide/large.

Goal: Switches are interconnected by L3 with routed interfaces BUT I need to span 1 or 2 VLANs to about 3-4 ports on every Switch and it should be tunneled over L3.

So here is my question:

Which type of L2 tunneling would be best here? GRE? VLL? PWE3? What would you recommend?

I don't mind learning and I am willing to invest time if necessary but I want to get the right direction before I move.

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user_46175     Created Dec 2, 2015 16:04:12 Helpful(0) Helpful(0)

wait for the expert to solve
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lizhuzhu     Created Dec 2, 2015 16:14:53 Helpful(0) Helpful(0)

L2 tunneling over L3. It's better to use VPLS. Other VPN cannot implement.

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edv_tj     Created Dec 2, 2015 16:59:20 Helpful(0) Helpful(0)

Thank you very much!

In this case I'm going to investigate LDP VPLS.

Excerpt out of S2750EI&S5700 Series Ethernet Switches Configuration Guide - VPN

Traditional MPLS L2VPNs, such as the virtual leased lines (VLLs), can provide P2P
services but not P2MP services over a public network.

MPLS L3VPNs can provide P2MP services on the precondition that PEs keep routes
destined for end users. This implementation requires high routing performance of PEs.

To solve the preceding problems, VPLS, an MPLS-based Ethernet technology, is introduced.

Like Ethernet, VPLS supports P2MP communication.

VPLS is a Layer 2 label switching technology. From the perspective of users, the entire
MPLS IP backbone network is a Layer 2 switching device. PEs do not need to keep routes
destined for end users.

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