Hello Yugandar--some of your questions have already been answered in this thread: Admin VDC & Default VDC so I'll tackle the questions that I didn't answer there.
How many VDCs can we create for a N7K depends on the no of Supervisor Modules we have for that 7K Switch i.e. if we have multiple Sup-1 modules in a 7k switch then we can have 4 VDCs per Sup-1 module ?. ......Similarly if we have multiple Sup-2 modules then we can have 4+1 VDCs per Sup-2 Module ?.
Can a Nexus 7K chassis have different Supervisor modules installed?
The N7K chassis only has the capability to hold two supervisor modules, and the modules need to be the same. Since the sup modules run in active/standby the capacity of your switch to support VDCs is dependent upon the capabilities of the single module. That is, a switch with two sup-1s will support four VDCs, a switch with sup-2es will support eight plus the admin VDC (8+1).
Does this make sense to you? MM
The Default VDC is preconfigured in a Nexus 7000 Switch Series.
The administration tasks for other VDCs can be performed in the Default VDC and the Admin VDC. However, the Default VDC is a virtual segment with all the features.
The VDC Admin is optional. Interfaces of some module of line cards cannot be assigned to the VDC Admin and feature sets cannot be enabled in the VDC Admin. You can create a VDC Admin only on systems with Cisco Nexus 7000 Series Supervisor-2E modules.
Thank you for the clarification
In my studies of Data center, I only listen about Sup-2
Good! I found in Cisco page
Admin VDCs are supported on Supervisor 1 and Supervisor 2/2e modules. When an admin VDC is enabled, only the mgmt0 port is allocated to the admin VDC.
Thank you Micheline,... Could you please help by clarifying the following queries:-
1. So for Sup-2 Module where we can have 4+1 VDCs or Sup-2E module where we have 8+1 VDCs.. there is no default VDC as there is an admin VDC from where we can create other VDCs and allocate interfaces & resources to those VDCs ?.
2. If we have 2 Nexus 7K switches and if we want to configure HA between them in a Active / Standby Mode then can we configure VDCs between them in a Active / Standby so if one VDC goes down in one Sup module of 7k-1 .. the other VDC on Switch 7k-2 becomes active.
So for Sup-2 Module where we can have 4+1 VDCs or Sup-2E module where we have 8+1 VDCs.. there is no default VDC as there is an admin VDC from where we can create other VDCs and allocate interfaces & resources to those VDCs ?.
Yes. This is also true for the Sup-1, which can only support four total VDCs.
If we have 2 Nexus 7K switches and if we want to configure HA between them in a Active / Standby Mode then can we configure VDCs between them in a Active / Standby so if one VDC goes down in one Sup module of 7k-1 .. the other VDC on Switch 7k-2 becomes active.
There are some protocols, such as HSRP, in which you can configure active/standby, but generally speaking, VDCs aren't used to create redundancy. VDCs are used better utilize resources. For example, since the Nexus 7000K cannot support an SVI and an OTV edge device on the same "box", a VDC can be used to segregate resources in order to run SVIs on one VDC and the OTV edge device on another VDC.
If you need to create L2 redundancy, a better technology would be vPC.
Does this answer your question? MM
Thank you Micheline,
So when we insert a SUP-2 module in N7K and connect to the Mgmt Port of this SUP-2 module, then we are in the ADMIN VDC which is nothing but a DEFAULT VDC in SUP-1.
From this ADMIN VDC in SUP-2 we can create 4 more additional VDCs, allocate resources etc and do all the functions that we can do from a DEFAULT VDC in SUP-1.