Configuration Changes and Settings that Can Impact Upgrades
Dependingupon the configuration of your Cisco UCS domain, the following changes may require you to
makeconfiguration changes after you upgrade. To avoid faults and other issues, we recommend that you
makeany required changes before youupgrade.
Overlapping FCoE VLAN IDs and Ethernet VLAN IDs Are No Longer Allowed with Cisco UCS Release 2.0
InCisco UCS 1.4 and earlier releases, Ethernet VLANs and FCoE VLANs could have overlapping VLAN
IDs.However, starting with Cisco UCS release 2.0, overlapping VLAN IDs are not allowed. If Cisco UCS
Managerdetects overlapping VLAN IDs during an upgrade, it raises a critical fault. If you do not reconfigure
yourVLAN IDs, CiscoUCS Manager raises a critical fault and drops Ethernet traffic on the overlapped
VLANs.Therefore, we recommend that you ensure there are no overlapping Ethernet and FCoE VLAN
IDsbefore you upgrade to Cisco UCS release 2.0.
Ifyou did not explicitly configure the FCoE VLAN ID for a VSAN in Cisco UCS 1.4 and earlier releases,
CiscoUCS Manager assigned VLAN1 asthe defaultFCoE VLAN for the default VSAN (with default
VSANID 1). In those releases, VLAN 1 was also used as the default VLAN for Ethernet traffic. Therefore,
ifyou acceptedthe default VLAN ID for the FCoE VLAN and one or more EthernetVLANs, you must
reconfigurethe VLAN IDs for either the FCoE VLAN(s) on the VSAN(s) or the EthernetVLAN(s).
Caution
Fora new installation of Cisco UCS release 2.0, the default VLAN IDs are as follows:
• The default Ethernet VLAN ID is 1.
• The default FCoE VLAN ID is 4048.
Afteran upgrade from Cisco UCS release 1.4, where VLAN ID 4048 was used for FCoE storage port native
VLAN,to release 2.0, the default VLAN IDs are as follows:
• The default Ethernet VLAN ID is 1.
• The current default FCoE VLAN ID is preserved. Cisco UCS Manager raises a critical fault on the
conflictingEthernet VLAN, if any. You must change one of the VLAN IDs to a VLAN ID that is not
usedor reserved.
Ifa Cisco UCS domain uses one of the default VLAN IDs, which results in overlapping VLANs, youcan
changeone or more of the default VLAN IDs to any VLAN ID that is not used or reserved. In release 2.0,
VLANswith IDs from 3968 to 4047 are reserved.
Note
VSANs with IDs in the Reserved Range are not Operational
AVSAN withan ID in thereserved range is not operational after an upgrade. Make sure that none of the
VSANsconfigured in Cisco UCS Manager are in the reserved range, as follows:
• If you plan to use FC switch mode in a Cisco UCS domain, do not configure VSANs with an ID in the
rangefrom 3040 to 4078.
• If you plan to use FC end-host mode in a Cisco UCS domain, do not configure VSANs with an ID in
therange from 3840 to 4079.
Cisco UCS Manager GUI Configuration Guide, Release 2.0
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Firmware Upgrades