06-04-2013 08:49 PM - edited 03-01-2019 07:20 AM
Hi Expert,
Two data center connected and using OTV. Normally we can stretch Vlan domain from one data center using OTV to Other Data Center.
1. Is there any way that we can stretch Different Two different IP Domain Vlans over OTV
2. Can we do QinQ over OTV ?
eg.
Requirement 1 (Different Vlan on both side with different IP Domains)
Vlan 10 (10.1.1.1)--------- Nexus (DC1) ----------OTV------------Nexus(DC2)--------------Vlan20 (20.1.1.1) ???
Requirement 2 (same vlan on both side but different ip domain)
Vlan 10 (10.1.1.1) --------- Nexus (DC1) ----------OTV------------Nexus(DC2)------------Vlan10 (20.1.1.1)?
any comment would be higly appricated
Regards
06-05-2013 05:34 AM
Hi there
first of all you need to have a logical approach why yo need to stretch a L2 vlan between two DCs
is it server clustering requriments, is VM requriemnts ..etc
if you are going to have differnt VLAN and differnt L3 IP subnet then there is not need to ass OTV or to use it in this case just use L3 DCI between the two DCs this is for requirements 1
for requirements 2 not sure why you need to keep the vlan same number while the IPs are differnt this dose look a L2 adjacency and as stated above L3 link can dose the job because in any way you need a L3 routing interface to routed between those two differnt IP subents !!
using QinQ is no something you need based on the above, also using QinQ with OTV will be too many encapsulations which is going to make things very complicated,
hope this help
06-05-2013 08:23 AM
Hi Marwan,
Thanks for your reply
Let me rephrase it ,Let say I have two data center
DC 1 with Vlan 10 SVI 10.0.0.0
DC 2 with Vlan 10 SVI 20.0.0.0
It was never interconnected. Now we have data center interconnected and OTV is running so few vlan are been stretch already eg. 20,30,40 within same subnet
For this old configuration is there any way to stretch using same vlan with different subnet because changing at DC2 Vlan 10 SVI and its related devices IPs as DC1 would be nightmare
06-08-2013 12:37 PM
ok, lets put it this way
if you have server in DC1 with ip 10.0.0.1 and another server in DC2 with IP 20.0.0.1 and both in VLAN10
those servers if they need to communicate with each other they need to go to a L3 interface to perform the routing between the two subnets
in other words there is no benefit that i see you can get by extending vlan 10 if its configured with differnt ip subnet
the idea of vlan stretching is to keep L2 adjacency between devices for some servers/hosts requirements
if you dont not need the stretch dont do it
hop this help
06-23-2013 05:26 AM
dose it make more sense to you now ?
12-17-2013 05:02 AM
Not sure if this is answered, but here is what I understand...
For case1: You can actually give a shot towards inter-vlan routing via OTV. I see that this was working without much concern. However, I have tested it on only ASR1K routers and not on Nexus.
Here is the link for the configuration if you need for the same:
http://stayinginit.blogspot.in/2013/12/inter-vlan-traffic-over-otv.html
Hope this helps,
I am not sure about case2, so let me do some research on this and get back.
Regards,
Aries
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