Cisco Nexus 5000 Series NX-OS Software Configuration Guide
Configuration Limits
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Configuration Limits

Table Of Contents

Configuration Limits


Configuration Limits


The features supported by the Cisco Nexus 5000 Series Switch have maximum configuration limits. Some of these limits apply only when one or more Cisco Nexus 2000 Series Fabric Extender units are attached to the switch. For some of the features, we have verified configurations that support limits less that the maximum. Table 51-1 lists the Cisco verified limits and maximum limits for switches running Cisco NX-OS Release 4.0.x.

Table 51-1 Configuration Limits 

Feature
Verified Limit
Maximum Limit

Fabric Extender per switch

12 units

N/A

VLANs per switch1

256

1024 minus the number of configured VSANs

Ethernet MTU

9,216 bytes

9,216 bytes (ASIC limit)

STP logical interface instances

3,000 instances
Only 2,500 can be true STP bridge to STP bridge connections

N/A

MST instances per switch (every instance is RSTP enabled)

64

64 (IEEE standard)

Station Table2

16,000 entries

32,000 entries

IP Multicast addresses (IGMP snooping)

1,000 addresses

1,000 addresses

VSANs per switch3

32

1024 minus the number of configured VLANs

Device Aliases per fabric

8,000

8,000

Event Traps - forward via Email

4 destinations

50 destinations

Switches in a single physical fabric or VSAN

50

239

Domains per VSAN

40

239

Native FC links per switch

164

164

FLOGIs or FDISCs per NPV port group

62

100

Zones per virtual or physical F port (includes all VSANs)

32

2,048 per ASIC

Zone sets per switch (includes all VSANs)

500

1,000

Zone members per physical fabric (includes all VSANs)

8,000

20,000

Zones per switch (includes all VSANs)

8,000

8,000

Maximum diameter of a SAN Fabric

3 hops

12 hops

FSPF interface instances per switch

256

4,0965

ISL instances per switch

256

256 (up to 8 Fibre Channel interfaces, each with up to 32 VSAN instances)

Virtual interfaces

52 virtual Fibre Channel interfaces

52 virtual Fibre Channel interfaces

QoS System Classes

5 user-configurable classes

5 user-configurable classes

VLAN ACL (VACL) entries for the whole switch

1,024

1,024

Port ACL (PACL) entries per physical Ethernet interface

128

128

ACL Accounting

32

32

Fibre Channel Flows

32

32

EtherChannels and SAN port channels

4 SAN port channels and 12 EtherChannels

16 port channels (any combination of SAN port channels and EtherChannels)

SPAN Sessions6

2 active sessions

18 sessions configured (2 active)

Egress SPAN sources

2

2

1 The entire 4094 VLAN ID space is supported.

2 Station table contains all unicast Ethernet MAC addresses and Ethernet multicast addresses.

3 The entire 4094 VSAN ID space is supported.

4 Requires two N5K-M1008 expansion modules.

5 This is the number of Extended ISLs (16) times the number of VSANs (256).

6 Only one SPAN session is supported for all the host interfaces on the same Fabric Extender. A Fabric Extender host interface cannot be configured as a SPAN destination.