Configuration Limits

First Published: September 8, 2023

Last Updated: October 22, 2024

Configuration Limits

The limits in this document indicate the maximum scale capability tested for the corresponding feature individually. This number is the absolute maximum currently supported by Cisco UCS Manager for the corresponding feature. When used in combination, the practical limit for each feature may be lower than the maximum limit cited in this document.

Ethernet Environment Configuration Limits

Feature

Cisco UCS 6332 Series

Cisco UCS 6324

Cisco UCS 6400 Series

Cisco UCS 6536

Cisco UCSX-S9108-100G

Active VLANs per Cisco UCS domain

3000

This is the combined total of VLANs and VSANs that can be configured on each fabric interconnect. Of that total, no more than 32 can be VSANs.

982

3000

This is the combined total of VLANs and VSANs that can be configured on each fabric interconnect. Of that total, no more than 32 can be VSANs.

3000

This is the combined total of VLANs and VSANs that can be configured on each fabric interconnect. Of that total, no more than 32 can be VSANs.

3000

This is the combined total of VLANs and VSANs that can be configured on each fabric interconnect. Of that total, no more than 32 can be VSANs.

VLAN/VSAN ID space per Cisco UCS domain

4030-4047 and 4095 are reserved

4030-4047 and 4095 are reserved

4030-4047 and 4095 are reserved and fixed

4030-4047 and 4095 are reserved and fixed

4030-4047 and 4095 are reserved and fixed

STP logical Interfaces (also referred to as VLAN port count) per fabric interconnect *

64000 (with VLAN Port Count Optimization enabled)

16000 (with VLAN Port Count Optimization disabled)

4096

108000 (with VLAN Port Count Optimization enabled)

16000 (with VLAN Port Count Optimization disabled)

108000 (with VLAN Port Count Optimization enabled)

32000

Note

 

*The only exception is for failover vNICs. These consume resources on a per Cisco UCS domain basis.

Supported up to 108,000 VLAN port count per fabric interconnect, verified in large-scale deployments for 6400/6536 with VLAN Port Count Optimization enabled.

VIFs (virtual interfaces) per fabric interconnect that map through VM-FEX to a vNIC or VM itself *

KVM VM-FEX—2670 **

648

1600

1600

256

Note

 

*The only exception is for failover vNICs. These consume resources on a per Cisco UCS domain basis.

Note

 

**Beginning with Cisco UCS Manager Release 4.1(1), VMware VM-FEX and Hyper-V VM-FEX are no longer supported. VM-FEX is supported only with Linux.

IGMP groups per Cisco UCS domain

4000

1000

16000

16000

2000

Uplink port channels per fabric interconnect

12

4

8*

8

8

Note

 

*When there is a mix of FC SAN port channels and FCoE SAN port channels, then together they cannot exceed a total of 8 port channels in the system.

FC SAN port channels + FCoE SAN port channels: 8 (4 +4, 3+ 5, 2+ 6, 1+7, or 0+8)

Maximum number of uplinks per fabric interconnect (including up to12 port channels)

31

4

31

31

8

Member interfaces per port channel

16

4

16

16

16

Interfaces per FCoE SAN port channel

16

4

16

16

16

Primary VLANs per Cisco UCS domain*

150

N/A

200

200

42

Note

 

*Private VLANs count towards the total number of VLANs.

Secondary VLANs per Cisco UCS domain

1000

N/A

1000

1000

126

Maximum secondary VLANs per primary VLANs.

200

N/A

200

200

126

QOS system classes per Cisco UCS domain

6 (including the class default)

6

6 (including the class default)

6 (including the class default)

6 (including the class default)

VIC Environment Configuration Limits

Static Virtual NICs per Host for Cisco UCS 6332, Cisco 6324, 6400, 6536, and UCSX-S9108-100G Fabric Interconnects

OS vNICs vHBAs Max Combination of vNICs and vHBAs

Windows

20

16

12 Enics and 8 Fnics

Ubuntu

32

N/A

32 Enics

ESXi

26

16

18 Enics and 8 Fnics

or 24 Enics and 2 Fnics

Oracle

18

6

18 Enics and 6 Fnics

Linux

  • Red Hat Enterprise Linux

  • XenServer

  • SUSE Linux Enterprise Server

  • CentOs

  • Rocky Linux

  • Red Hat CoreOS

32

16

24 Enics and 8 Fnics

Note

For supported Operating System versions, see UCS Hardware and Software Compatibility.

Dynamic Virtual NICs

Dynamic vNICs are not supported by Cisco UCS 6400 Series, 6500 Series, and UCSX-S9108-100G Fabric Interconnects. Dynamic vNICs are not supported on VIC 1400 series adapters with Windows and ESX OS versions.


Note

**The support for VM-FEX is limited to Linux on the specific topologies outlined in the following table.

Cisco UCS 6300 Series Fabric Interconnects

Note

 
Cisco UCS 6324 Fabric Interconnect is not supported.

OS

Max vNICs for Emulated Mode Max vNICs for Hypervisor Bypass Mode

Half Width Blade (1 VIC)

Full Width Blade (2 VIC)

Half Width Blade (1 VIC)

Full Width Blade (2 VIC)

RHEL 8.x and 9.x (SR-IOV with MacVTap)

114 vNICs and 2 vHBAs

223 vNICs with 4 vHBAs

N/A

N/A

Note

 

KVM VM-FEX is not supported on the Cisco 6324 Fabric Interconnect

KVM 8.x and 9.x (SR-IOV with PCI Passthrough)

N/A

N/A

114 vNICs and 2 vHBAs

223 vNICs with 4 vHBAs

Note

 

KVM VM-FEX is not supported on the Cisco UCS 6324, 6400 Series, and 6500 Series Fabric Interconnects.

Fibre Channel Environment Configuration Limits

Feature

Cisco UCS 6332 Series

Cisco UCS 6324

Cisco UCS 6400 Series

Cisco UCS 6536

Cisco UCSX-S9108-100G

VSANs

6332-16UP—15

6332—32

A combined total of 3000 VLANs and VSANs can be configured on each fabric interconnect.

32

32

32

32

Zones

  • Per VSAN—8000

  • Across all VSANS—8000

If you implement Cisco UCS Manager-based zoning, the maximum number of targets per service profile is 64.

  • Per VSAN—4000

  • Across all VSANS—4000

If you implement Cisco UCS Manager-based zoning, the maximum number of targets per service profile is 4.

  • Per VSAN—4000

  • Across all VSANS—4000

If you implement Cisco UCS Manager-based zoning, the maximum number of targets per service profile is 64.

  • Per VSAN—4000

  • Across all VSANS—4000

If you implement Cisco UCS Manager-based zoning, the maximum number of targets per service profile is 64.

  • Per VSAN—4000

  • Across all VSANS—4000

If you implement Cisco UCS Manager-based zoning, the maximum number of targets per service profile is 64.

Native FC links

6332-16UP—16

6332—N/A

4

16

Ports 1 to 16 support native FC*

16

Ports 1/33/1 to 1/36/4 support native FC

8

Ports 1/1/1 to 1/2/4 support native FC

Note

 

*For UCS 6454, the number of FC links was increased from 8 to 16 in Cisco UCS Manager Release 4.0(4a)

Virtual Fibre Channel interfaces per fabric interconnect

320

30

320

320

64

Virtual Fibre Channel interfaces per blade

16

16

16

16

16

FC-NVMe initiators per blade

4

4

4

4

4

Flogis per fabric interconnect

320

255

320

320

64

Maximum number of FC SAN port channels

4

1

4

4

4

Maximum port channel members per port channel

16

4

16

16

8

Port channel mode in NPV

Active

N/A

Active

Active

Active

Port channel mode in FC switching

On

On

On

On

On

VM-FEX Environment Configuration Limits


Note

**The support for VM-FEX is limited to Linux on the specific topologies outlined in the following table.

Cisco UCS 6332 Series Cisco UCS 6400 Series

Cisco UCS 6500 Series

Cisco UCSX-S9108-100G

Port profiles per Cisco UCS domain

512

N/A

N/A

N/A

Dynamic ports per port profile

4096

N/A

N/A

N/A

General Network Configuration Limits

Feature Cisco UCS 6332 Series Cisco UCS 6324 Cisco UCS 6400 Series

Cisco UCS 6500 Series

Cisco UCSX-S9108-100G

Unicast MAC addresses per fabric interconnect

32000 entries

20000 entries

96000 entries

96000 entries

24000 entries

Multicast MAC addresses per fabric interconnect

7000

400

7000

7000

2000

Secured interfaces per Cisco UCS domain

1000

1000 out of the 2000 VIFs can be port-secured.

N/A

1000

1000 out of the 2000 VIFs can be port-secured.

1000

1000 out of the 2000 VIFs can be port-secured.

256

Secured MAC addresses per Cisco UCS domain

2000

MAC addresses secured using the port-security feature.

N/A

8000

MAC addresses secured using the port-security feature.

8000

MAC addresses secured using the port-security feature.

8000

MAC addresses secured using the port-security feature.

Maximum MTU (Driven by the QoS Configuration)

9216

9216

9216

9216

9216

1G ports 1

6332-16UP—16

6332—First 4 ports

4—First 4 unified ports

6454 - 4 (45-48)

64108 - 8 Ports (89-96)

6536 - 2 unified ports (Ports 9 and to 10)

Cisco UCSX-S9108-100G (Ports 7 and 8)

SPAN active sessions per fabric interconnect

4

2

4

4

4

Appliance ports per fabric interconnect

16

2

16

16

8
1 For Ethernet Traffic Monitoring sessions in 6332 and 6332-16UP FIs, you cannot use the 1Gbps speed configuration for the configured Ethernet Destination Port.

General Management Configuration Limits

Feature Cisco UCS 6332 Series Cisco UCS 6324 Cisco UCS 6400 Series

Cisco UCS 6500 Series

Cisco UCSX-S9108-100G

Chassis per Cisco UCS domain

20

2

20

20

1

Maximum combined number of blade and rack servers per Cisco UCS domain

160

20 (16 blade servers and 4 rack servers)

160

160

8 (only Cisco UCS X-Series blade server)

Note

 

This value has been validated for stability and responsiveness in high-scale environments with Cisco UCS Manager Release 4.3.
Maximum number of Fabric Extenders per Cisco UCS domain 2

20 (10 per fabric interconnect)

N/A

20 (10 per fabric interconnect)

20 (10 per fabric interconnect)

N/A

Local user accounts per Cisco UCS domain

48

48

48

48

48

Concurrent logins per user account

64

This total includes a maximum of 32 concurrent GUI logins and 32 concurrent CLI logins per user account.

This value is the same for both local and remote user accounts.

64

This value is the same for both local and remote user accounts.

This total includes a maximum of 32 concurrent GUI logins and 32 concurrent CLI logins per user account.

64

This total includes a maximum of 32 concurrent GUI logins and 32 concurrent CLI logins per user account.

This value is the same for both local and remote user accounts.

64

This total includes a maximum of 32 concurrent GUI logins and 32 concurrent CLI logins per user account.

This value is the same for both local and remote user accounts.

64

This total includes a maximum of 32 concurrent GUI logins and 32 concurrent CLI logins per user account.

This value is the same for both local and remote user accounts.

Active KVM sessions per individual CIMC

4

4

4

4

4

Concurrent CLI logins per Cisco UCS Manager

32

32

32

32

32 (Default & Recommended - 16)

Concurrent GUI logins per Cisco UCS Manager

256

256

256

256

256

Number of LDAP groups per Cisco UCS Manager

160

160

160

160

160

Number of adapter end points per Cisco UCS Manager

320

30

320

320

16
2

There is a limit of twenty FEX for each UCS domain. For example, you can either have ten 2232 FEX for each FI or a combination of ten chassis and ten FEX.