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Cisco MDS NX-OS Release 6.2 Configuration Limits

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Table of Contents

Cisco MDS NX-OS Release 6.2(9) Configuration Limits

Switch-Level Fibre Channel Configuration Limits for Cisco MDS 9000 Series Switches

Fabric-Level Fibre Channel Configuration Limits for the Cisco MDS 9000 Series Switches

Fibre Channel Topology Combinations and Scaling

Fibre Channel Scale Limitations

Limitation 1

Limitation 2

Syslog and Warnings for Fibre Channel Network Scale

Switch-Level Configuration Limits for Fibre Channel over Ethernet (FCoE)

Fabric-Level Configuration Limits for Fibre Channel over Ethernet (FCoE) on MDS 9700 Series

Cisco IOA Configuration Limits

Fibre Channel Flow Configuration Limits

Cisco MDS NX-OS Release 6.2(9)
Configuration Limits

Published: July 11, 2014
Part Number: OL-29292-02

This document discusses the configuration and scalability limits for various SAN switching parameters in Cisco MDS NX-OS Release 6.2(9) and has the following topics:


Note Beginning Cisco MDS NX-OS Release 6.2(7), Fibre Channel (FC) scale enhancements for zoning and device logins are introduced. However, these enhancements currently are available only on Cisco MDS 9700 Series switches that are running Cisco MDS NX-OS Release 6.2(7) or later and they are not available on fabrics that have switches other than Cisco MDS 9700 Series switches.


Switch-Level Fibre Channel Configuration Limits for Cisco MDS 9000 Series Switches

Table 1-1 lists the switch-level Fibre Channel configuration limits for Cisco MDS 9000 Series switches.

Table 1-1 Switch-Level Fibre Channel Configuration Limits

Feature
Parameters
MDS 9700 Series
MDS 9500 Series
MDS 9250i
MDS 9148/9148S

Logins (FLOGI or FDISC)

FLOGIs or FDISCs per port

256

256

256

256

FLOGIs or FDISCs per module

1000

400

N/A

N/A

FLOGIs or FDISC per switch

4000

2000

400

1000 (MDS 9148S)

400 (MDS 9148)

N-Port Virtualization (NPV)

NPV switches per NPIV core switch

105

105

N/A

N/A

Inter-Switch Links (ISLs)

ISL instances per switch

Up to 200 ISLs, each ISL with 16 VSANs, for a total number of 3200 port-VSAN instances

Up to 200 ISLs, each ISL with 16 VSANs, for a total number of 3200 port-VSAN instances

Up to 40 ISLs, each with 29 VSANs, for a total number of 1160 port-VSAN instances

Up to 48 ISLs, each with 29 VSANs, for a total number of 1392 port-VSAN instances

PortChannels

PortChannels and member ports in port channels1

256 PortChannels with a maximum of 16 members in each port channel

256 PortChannels with a maximum of 16 members in each port channel

40 PortChannels with a maximum of 16 members in each port channel and 8 Ethernet PortChannels with a maximum of 8 members in each Ethernet PortChannels

48 PortChannels with a maximum of 16 members in each port channel

SSH

SSH2

16

16

16

16

1.A system message appears in the user’s session when the maximum supported limit of PortChannels and member ports is exceeded.

2.A system message appears on the user’s session when the maximum supported number of SSH sessions is exceeded.

Fabric-Level Fibre Channel Configuration Limits for the Cisco MDS 9000 Series Switches

Table 1-2 lists the Fibre Channel configuration limits for the Cisco MDS 9000 Fibre Channel fabric network.

Table 1-2 Fabric-level Fibre Channel Configuration Limits

Feature
Parameters
MDS 9700-only Network
(without MDS 9500, 9200, and 9100)
MDS Mixed Fabric Network
(MDS 9700, 9500, 9200, 9148, and 9148S)

VSANs

Number of VSANs per physical fabric

80

80

Logins and aliases

Number of FCNS entries in fabric 3 4

20000

10000

Number of device alias entries in fabric

12000

8000

Domains and Hops

Number of domains per physical fabric

60

60

Number of switch hops from server to storage

7

7

Zones

Zone sets

500

500

Zones 5 6

16000

8000

Zone members 7 8

32000

16000

Zone DB size 9

3.8 MB

2 MB

IVR

IVR zone sets

32

32

IVR zones10

2000

2000

IVR zone member

4000

4000

IVR service groups

16

16

3.An error message appears in the user’s session if the number of FCNS entries exceeds 20000.

4.For platforms other than Cisco MDS 9700, a warning appears in the user’s session if the number of FCNS entries exceeds 10000.

5.An error message and syslog appear in the user’s session if the total number of zones exceeds 16000.

6.For platforms other than Cisco MDS 9700, a warning appears in the user’s session if the number of zones exceeds 8000. However, further configurations are not blocked.

7.An error message and syslog appear in the user’s session if the total number of the unique zone members exceed 32000.

8.For platforms other than Cisco MDS 9700, a warning appears in the user’s session if the number of unique zone member exceeds 16000.

9.Beginning Cisco MDS NX-OS 6.2(7) Release, the zone database size has been increased from 2 MB to 3.8 MB to provide zone scale enhancements. However, if there are any switches in the fabric running Cisco MDS NX-OS 6.2(5) or earlier releases, the previous 2-MB zone database limit prevails and the new zone scale enhancements are not available. We recommend that the 2-MB zone DB limit not be exceeded unless all the switches in the fabric run Release 6.2(7) or later releases. An error message appears in the user’s console if the zone database size exceeds 3.8 MB.

 

The following example shows how to calculate Zone DB size for a fabric:

 
(config)# show zone status vsan 310 | Inc "Db Size" P 1
Full Zoning Database :
Db Size: 1040524 Bytes
--
Active Zoning Database :
Db Size: 962156 Bytesc
 
Now, Add 962156 with 1040524 = 2002680

2002680 / (1024 * 1024) = 1.9 MB.


Note This database size does not include the pending changes in a session.


10.2000 IVR zones are across all VSANs. A single VSAN must not exceed 1000 IVR zones.

Fibre Channel Topology Combinations and Scaling

Beginning Cisco MDS NX0-OS Release 6.2(7), the following configurable features to support scale enhancements are supported:

  • Fibre Channel Name Server (FCNS) bulk notification
  • Coalesce switch Registered State Change Notification (SW-RSCN)

For more information about the FCNS and SW-RSCN features, see the Cisco MDS 9000 Family NX-OS Fabric Configuration Guide and the Cisco MDS 9000 Command Reference.

Table 1-3 provides the configuration limits with and without the FCNS and SW-RSCN optimizations.

Table 1-3 Fibre Channel Topology Combination and Scaling

Scale Topology
FCNS Bulk Notification
Coalesce Switch RSCN
Configuration Limits
Scale Optimizations

Cisco MDS NX-OS Release 6.2(9) on Cisco MDS 9700 Series-only Fabric

ON

ON

MDS NX-OS Release 6.2(7) and later




Enabled

 

 

FLOGI per module: 1000

FLOGI node: 4000

FCNS: 20000

Zone:16000

Zone members: 32000

OFF

OFF

MDS NX-OS Release 6.2(5) and earlier



Disabled
(Disabled by default in MDS NX-OS Release 6.2(7))


 

 

FLOGI per module: 500

FLOGI node: 2500

FCNS: 10000

Zone: 8000

Zone members: 16000

Cisco MDS NX-OS Release 6.2(9) on MDS Mixed Fabric11 (Cisco MDS 9700 Series, 9500, 9250i, 9222i, and 9148)

ON/OFF

ON/OFF

FLOGI per module: 400

FLOGI node: 2000

FCNS: 10000

Zone: 8000

Zone members: 16000

Enabled/Disabled

11.The scale enhancements introduced in MDS NX-OS 6.2(7) and later are available on MDS 9700 Series-only networks with Release 6.2(7) and later running on all the switches and the configurable optimizations: FCNS bulk notification and RSCN coalesce enabled. These enhancements are not available on mixed fabrics regardless of whether the FCNS and RSCN are enabled.


Note In Cisco MDS NX-OS Release 6.2(9), FCNS bulk notification is enabled by default. To disable FCNS bulk notification, use the fcns no-bulk-notify command. Coalesce switch RSCN is disabled by default.


Fibre Channel Scale Limitations

Limitation 1

Beginning Cisco MDS NX-OS Release 6.2(7), the fcns bulk-notify and rscn coalesce swrscn vsan commands are available on all platforms. We recommend that you use these commands only on the Cisco MDS 9700 Series with the 48-Port 16-Gbps Fibre Channel switching module because the higher configuration limits are currently not supported on any other MDS platforms.


Note The FCNS bulk notification and coalesce switch RSCN features are supported only in NX-OS Release 6.2(7) and later releases. The switch coalesce RSCN should be enabled only if all the switches in the fabric are Cisco MDS switches that are running MDS NX-OS Release 6.2(7) or later.


Limitation 2

The maximum zone database size has been increased from 2 MB to 3.8 MB in Cisco MDS Release 6.2(7) and later for all MDS 9700 Series switches to enable zone scale enhancements. The new limit of 16000 zones is supported on an MDS 9700-only fabric. Fabrics with Cisco MDS 9500, 9200, or 9100 Series switches continue to have the 2-MB zone database limit, supporting only up to 8000 zones.

Syslog and Warnings for Fibre Channel Network Scale

Table 1-4 provides syslogs and warnings for the Fibre Channel network.

Table 1-4 FC Fabric Scale-Related Syslog and Warning

Syslog and Warnings
 
Cisco MDS 9700 Series
 
Cisco MDS 9500, 9200, and 9100
 

Zone limit

16000 zones – Hard limit: Syslog warning that states no more zones can be configured:

“Maximum configurable zone limit of 16,000 reached. Creation of any more zones is not supported.”

8000 zones – Soft limit: Syslog warning around validated zone limit:

“ Zone count has reached the maximum validated limit of 8,000. Creation of any more zones could potentially destabilize the fabric.”

16000 zones – Hard limit: Syslog warning that states no more zones can be configured:

“Maximum configurable zone limit of 16,000 reached. Creation of any more zones is not supported.”

FCNS limit

10000 FCNS entries (with the FCNS bulk notification feature disabled) – Soft Limit: Syslog warning around validated FCNS limit:

“Number of Name-Server entries has reached the maximum validated limit of 10,000. Any more entries could potentially destabilize the fabric.”

20000 FCNS entries – Hard limit: Syslog warning that states no more name server entries are supported:

“Maximum Name-Server entry limit of 20,000 reached. No more entries are supported.”

10000 FCNS entries – Soft limit: Syslog warning around validated limit:

“Number of Name-Server entries has reached the maximum validated limit of 10,000. Any more entries could potentially destabilize the fabric.”

20000 FCNS entries – Hard limit: Syslog warning:

“Maximum Name-Server entry limit of 20,000 reached. No more entries are supported.”

Switch-Level Configuration Limits for Fibre Channel over Ethernet (FCoE)

Table 1-5 lists the switch-level configuration limits for Fibre Channel over Ethernet (FCoE) on Cisco MDS.

Table 1-5 Switch-Level Configuration Limits for Fibre Channel over Ethernet

Feature
MDS 9710 with 48-Port 10-Gigabit Fibre Channel over Ethernet Module

FLOGIs per Port

256

FLOGIs per Module

1000

FLOGIs per Switch

4000

VSAN

80

VSAN-VLAN Mapping

80

vFC PortChannel and Member Ports

128 vFC PortChannel and a maximum number of 16 members in one vFC PortChannel

Fabric-Level Configuration Limits for Fibre Channel over Ethernet (FCoE) on MDS 9700 Series

Table 1-6 lists the fabric-level configuration limits for the Fibre Channel over Ethernet on MDS 9700 Series.

Table 1-6 Fabric-Level Configuration Limits for Fibre Channel over Ethernet on MDS 9700 Series

Feature
MDS 9700 Network with 48-Port 10-Gigabit Fibre Channel over Ethernet Module

Zones 12

16000

Zone members 13

32000

Zone sets

500

Zone DB size 14

3. 8 MB

Number of FCNS entries in network 15

20000

Device alias

12000

12. A warning appears in the user’s console if the number of zones exceeds 8000. However, further configurations are not blocked.

13.An error message appears in the user’s console if the total number of the unique zone members exceed 16000.

14.Beginning Cisco MDS NX-OS Release 6.2(7), the Zone database size has been increased from 2 MB to 3.8 MB to provide zone scale enhancements. However, if there are any switches in the fabric running MDS NXOS 6.2(5) or lower releases, the previous 2 MB zone database limit would prevail and the new zone scale enhancements would not be available. We recommend that the 2-MB zone DB limit not be exceeded unless all the switches in the fabric run 6.2(7) or later releases. An error message appears in the user’s console if the zone database size exceeds 3.8 MB.

15.An error message appears in the user’s console if the number of FCNS entries exceeds 10000.

 

The following example shows how to calculate Zone DB size for a fabric:

 
(config)# show zone status vsan 310 | Inc "Db Size" P 1
Full Zoning Database :
Db Size: 1040524 Bytes
--
Active Zoning Database :
Db Size: 962156 Bytesc
 
Now, Add 962156 with 1040524 = 2002680

2002680 / (1024 * 1024) = 1.9 MB.


This database size does not include the pending changes in a session.


Cisco IOA Configuration Limits

Table 1-7 lists the IOA configurations and the corresponding limits.

Table 1-7 Cisco I/O Accelerator Configuration Limits

Configuration
Limit

Number of switches in a cluster

14

Number of Switches in the SAN for FC-Redirect

34

Number of IOA interfaces in a switch

44

Number of IOA interfaces in a cluster

44

Number of hosts per target 128

128

Number of tape flows in a cluster 4.2(7d)

1024

Number of tape flows across all clusters 4.2(7d)

1024

Number of tape flows in a cluster 5.2(6b) and later

1250

Number of tape flows across all clusters 5.2(6b) and later

1250

Number of disk flows across all or in a cluster

600

Number of flows per IOA service engine (hard limit) in Release 4.2(1)

128

Number of flows per IOA service engine (soft limit) in Release 4.2(1)

64

Number of flows per IOA service engine (hard limit) in Release 4.2(7)

512

Number of flows per IOA service engine (soft limit) in Release 4.2(7)

256

Number of concurrent flows per IOA service engine in Release 4.2(7)

128

Fibre Channel Flow Configuration Limits

Table 1-8 lists the FC flow configurations limits.

Table 1-8 FC Flow Limit

Cisco MDS Device
Aggregate Flow and Flow Statistics Limit
Flow Statements per Module

Generation 1 Modules

1000

1024

Generation 2 Modules

2000

2048

Generation 3 Modules

512

512

Generation 4 Modules

1919

1919