Half of the blades fell when creating a new channel of uplink port?

I have a pair of 6248UP fiber interconnection (A and B) with blade servers connected. The switch upstream is Nexus7k. Fabric A and B each right has now a channel of uplink port to the Nexus switch upstream. I add a new Nexus switch to connect to the interconnection of fiber. The plan is to have uplink some VIRTUAL networks for Nexus one pass and uplink some VIRTUAL to the second Nexus switch networks.

After that I configured the new Nexus switch with a channel port (only allowing some VIRTUAL networks) and corresponding port created on fabric channel A and B, new ports-channels have increased. However, half of the blade servers were down after that. What could be the reasons for this problem? Is it because half of the blades have been pinned dynamically on the new channel port, but the new port-channel side Nexus allow only some VIRTUAL networks?

Is there a way to configure the Channel ports on fiber to interconnect with only the trunk through some VIRTUAL networks? for traffic from the server would not be sent to the port-channel where VLAN server is not allowed?

Thank you

In general, all NICs for/vhba of a fabric are declining, if all uplinks of this fabric are declining.

It's not clear to me, what you're trying to achieve?

If you create a global VLAN (for the two fabrics), this vlan is automatically inserted in all dependent North trunk links, unless you configure a leaking installation

(http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns224/ns944/white_paper_c11-692008.html)

Create a new vlan on UCS requires of course also this vlan is created on the switch connection and vpc by default allows all the VLANS. Could it be, that the vlan not appeared on the switch and was therefore not upward on the trunk?

Tags: Cisco DataCenter

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