you're not entirely clear what you've tried as a network configuration on your UCS server. Of course you need access to the server in order to configure its networking, but that access can also be on the console, or you can add a temporary second network interface with its own IP address and connect via that interface.
In general UCS's network configuration supports both port trunking as well as tagged VLANs. Section 8.2.4 describes network configuration. Subsections "188.8.131.52.4.3. Bonding" and "184.108.40.206.4.4. VLANs" talk about bonding and VLANs respectively.
So what I'd probably do is something like this:
- Move the sever out of the VLAN temporarily,
- add a second network interface,
- configure said second network interface in a way that allows you access to it without VLAN tagging even if you move the server back to that VLAN with its first network interface,
- move the server's first interface back to said VLAN,
- use the second network interface for access to the UMC,
- use the UMC to configure bonding & VLAN for the primary network interface,
- verify the primary interface is working and
- remove the secondary interface again.
When you have a specific network configuration that doesn't work (yet), then post the output of
ucr search --brief interfaces/ here, please.