• VIFs on VNTAGadapters can have only one isolated VLAN.
Guidelines for VLAN IDs
Youcannot create VLANs with IDs from 3968 to 4047. This range of VLAN IDs is reserved.
VLANsin the LAN cloud and FCoEVLANs in the SAN cloudmust have different IDs. Using the same
IDfor aVLAN and an FCoE VLAN in a VSAN results in a critical fault and traffic disruption for all
vNICsand uplink ports using that VLAN. Ethernet traffic is dropped on any VLAN which has an ID that
overlapswith an FCoEVLAN ID.
Important
VLAN4048 is user-configurable. However, Cisco UCS Manager uses VLAN 4048 for the following default
values.If you want to assign 4048 to a VLAN, you must reconfigure these values:
• After an upgrade to Cisco UCS, release 2.0: The FCoE storage port native VLAN uses VLAN 4048 by
default.If the default FCoE VSAN wasset to use VLAN 1 beforethe upgrade, you must change it to a
VLANID that is not used or reserved. For example, consider changing the default to 4049 if that VLAN
IDis not in use.
• After a fresh install of Cisco UCS, release 2.0: The FCoE VLAN for the default VSAN uses VLAN
4048by default.The FCoE storage port native VLAN uses VLAN 4049.
TheVLAN name is casesensitive.
VLAN Port Limitations
CiscoUCS Manager limits the number of VLAN port instances that can be configured under border and server
domainson afabric interconnectto 6000.
Types of Ports Included in the VLAN Port Count
Thefollowing types of portsare countedin the VLAN portcalculation:
• Border uplink Ethernet ports
• Border uplink Ether-channel member ports
• FCoE ports in a SAN cloud
• Ethernet ports in a NAS cloud
• Static and dynamic vNICs created through service profiles
• VM vNICs created as part of a port profile in a hypervisor in hypervisor domain
Basedon the number of VLANs configured for these ports, Cisco UCS Manager keeps track of the cumulative
countof VLAN port instances and enforces the VLAN port limit during validation. Cisco UCS Manager
reservessome pre-defined VLAN port resourcesfor control traffic. These include management VLANs
configuredunder HIF and NIF ports.
VLAN Port Limit Enforcement
CiscoUCS Manager validates VLAN port availability during the following operations.
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VLAN Port Limitations