OTV between 3 datacenters

[abdulrasheeth]

Hi,

I have an requirement of connecting 3 datacenters with each site having a separate L3 link to other sites.

Can anyone guide me for a good design for extending L2 Vlans between them. I know OTV can provide it with 2 sites, but how to deploy it in this topology.

SiteA --------L3------------SiteB

   \                                  /

    \                               /

      L3                       L3

        \                      /

          \   SiteC      /

[Philip D'Ath]

What sort of kit are you planning on doing the OTV on?

[abdulrasheeth]

with Nexus 7700 series on each site

[InayathUlla Sharieff]

If you are talking on the Nexus then use the Unicast mode to achieve this.

Please find reference for the same:-

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html

HTH

Regards

Inayath

[abdulrasheeth]

Thanks for the reply.

one more thing.. If I connect all the 3 sites via OTV between them, should I take any precautions about STP, since there is a chance of MAC leak into the 2nd link.

[InayathUlla Sharieff]

You dont have to worry about the STP while configuring the OTV.

STP Isolation

Figure 1-18 shows how OTV, by default, does not transmit STP Bridge Protocol Data Units (BPDUs) across the overlay. This is a native function that does not require the use of an explicit configuration, such as BPDU filtering, and so on. This allows every site to become an independent STP domain: STP root configuration, parameters, and the STP protocol flavor can be decided on a per-site basis.

Please go thorugh the link:-

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html#wp1185920

HTH

Regards

Inayath

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