We have a dual core network. All access and distribution switches have dual uplinks to the core switches. One uplink port will be blocked by STP at any given time. Can you configure NIC Teaming on CUCM 7.x and above and configure one NIC in one switch and the other NIC in the redundant switch or do both NIC’s need to be in the same switch?
Yes, this is the supported/desired config for NIC Teaming as long
as the connected Switchports on the two switches are on the same VLAN.
"NIC Teaming for Network Fault Tolerance
The NIC teaming feature allows a server to be connected to the Ethernet via two NICs and, therefore, two cables. NIC teaming prevents network downtime by transferring the workload from the failed port to the working port. NIC teaming cannot be used for load balancing or increasing the interface speed.
Hewlett-Packard server platforms with dual Ethernet network interface cards can support NIC teaming for Network Fault Tolerance with Cisco Unified CM 5.0(1) or later releases.
IBM server platforms with dual Ethernet network interface cards can support NIC teaming for Network Fault Tolerance with Cisco Unified CM 6.1(2) and later releases. "
And the command to do that as per the CUCM OS CLI Reference Guide is:
"set network failover
This command enables and disables Network Fault Tolerance on the Media Convergence Server network interface card.
Well - the chances of one or two ports going down on one switch are much much higher than the chance of two ports on different switches going down for any number of reasons - administrative error, software/hardware failure, power loss, etc etc.
One switch will have ONLY it's REDUNDANT uplink blocked by STP. It will have connectivity as much as the other.
Generally speaking you would not bother enabling it if you only had one switch to connect to. If you have such a simple topology you probably have a low total port count in the room the server is in, and you probably wouldn't want to waste your sparse resources port to protect against administrative error and a cable failure failure.
The only types of fault tolerance that require linking to the same switch are those that support bandwidth aggregation/load balancing technologies, these aren't supported, and aren't available from the CLI.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
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