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• VIFs on VNTAG adapters can have only one isolated VLAN.
Guidelines for VLAN IDs
You cannot create VLANs with IDs from 3968 to 4047. This range of VLAN IDs is reserved.
VLANs in the LAN cloud and FCoE VLANs in the SAN cloud must have different IDs. Using the same
ID for a VLAN and an FCoE VLAN in a VSAN results in a critical fault and traffic disruption for all
vNICs and uplink ports using that VLAN. Ethernet traffic is dropped on any VLAN which has an ID that
overlaps with an FCoE VLAN ID.
Important
VLAN 4048 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 was set to use VLAN 1 before the upgrade, you must change it to a
VLAN ID that is not used or reserved. For example, consider changing the default to 4049 if that VLAN
ID is not in use.
• After a fresh install of Cisco UCS, release 2.0: The FCoE VLAN for the default VSAN uses VLAN
4048 by default. The FCoE storage port native VLAN uses VLAN 4049.
The VLAN name is case sensitive.
VLAN Port Limitations
Cisco UCS Manager limits the number ofVLAN portinstances thatcan be configuredunder borderand server
domains on a fabric interconnect to 6000.
Types of Ports Included in the VLAN Port Count
The following types of ports are counted in the VLAN port calculation:
• 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
Based on the number of VLANs configured for these ports,Cisco UCS Manager keeps track of the cumulative
count of VLAN port instances and enforces the VLAN port limit during validation. Cisco UCS Manager
reserves some pre-defined VLAN port resources for control traffic. These include management VLANs
configured under HIF and NIF ports.
VLAN Port Limit Enforcement
Cisco UCS Manager validates VLAN port availability during the following operations.
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 279
VLAN Port Limitations