for DCI what let me choose VxLAN over OTV and vice-versa in order to stretch VLANs

[Ibrahim Jamil]

Hi Guys

Consultancy Qs

for DCI what let me choose VxLAN over OTV and vice-versa in order to stretch VLANs

Thanks

[balaji.bandi]

Its all depends on use case - personally i look this way : (this may have different opinion on  different views. - what works for you is important based on the use case as mentioned.

High level -

Most of the DCI Layer 2 extention i will use OTV - when you stretching the Layer 2.

VXLAN i use internal VLAN Mobility in the SAME DC or across Enterprise camput.

high level you can view here  with comparet :

https://blog.ipspace.net/2011/09/vxlan-otv-and-lisp.html

https://www.routexp.com/2018/03/vxlan-and-otv-what-is-difference.html

[Sergiu.Daniluk]

Hi @Ibrahim Jamil 

This is an old and long discussion: what to use for DCI - OTV or VXLAN Multi-Site. And yes, I mentioned VXLAN Multi-Site, because in my opinion, vxlan by itself is not a DCI technology.

Anyway, I made a quick table comparing the two. The table is definitely not complete, but other community members can add to it.

	OTV	VXLAN Multi-Site
Packet Encapsulation Mode	Ethernet over MPLS over GRE over IP (For M2/F2e) Ethernet over UDP-IP (over VXLAN for M3/F3)	Ethernet over UDP-IP (MAC-in-UDP)
Supporting Devices	Nexus 7000 (anounced EoL, March 2021) / Nexus 7700 (not yet EoL)	Nexus 9000
Number of Sites Supported	12	25
Overhead	42 Bytes	50 Bytes (54 Bytes if original 802.1q header is preserved)
Underlay	Dark Fiber/DWDM/IP	Dark Fiber/DWDM/IP
Control Plane	ISIS	BGP EVPN
Loop Prevention	yes	yes
Fault Containment	yes	yes
Inter-site Multi-Homing	yes	yes
Path Optimization (EW)	FHRP Isolation	Distributed Anycast Gateway
Path Optimization (NS)	LISP w/ LAN ext.	Preferred AS-Path, Advertising Host routes
Site L2 Isolation	Yes	Yes
Required devices	Only OTV VDC for encapsulation	VTEPs and Border Gateways
MAC mobility	Yes	Yes
Configuration complexity	Not complex	Relativly complex
DCNM support	Yes	Yes (recommended for multi-site)

Hope it helps,

Sergiu

[Ibrahim Jamil]

Thanks guys very valuable informations