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. 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.

Table 51-1 Configuration Limits 

Feature
Verified Limit
Maximum Limit

VLANs per switch1

250

1024 minus the number of configured VSANs

Ethernet MTU

9,216 bytes

9,216 bytes (ASIC limit)

PVRST+

250 PVRST+ instances, 4,000 STP interface states

53,248 STP interface states2

MST instances per switch (every instance is RSTP enabled)

64

64 (IEEE standard)

Station Table3

16,000 entries

32,000 entries

IP Multicast addresses (IGMP snooping)

1,000 addresses

1,000 addresses

VSANs per switch4

32

256

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

8

8

FLOGIs or FDISCs per NPV port group

62

100

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

32

2,048 per ASIC5

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

4,0966

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

4 user-configurable classes

4 user-configurable classes

VLAN ACL (VACL) entries for the whole switch

1,024

ASIC limit7

Port ACL (PACL) entries per physical Ethernet interface

128

ASIC limit7

ACL Accounting

32

256 counters per ASIC8

Fibre Channel Flows

32

256 counters per ASIC8

Port channels

4 SAN port channels and 12 Ethernet port channels

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

SPAN Sessions

2 active sessions

18 sessions configured (2 active)

Egress SPAN sources

2

2

1 The entire 4094 VLAN ID space is supported.

2 1024 STP instances times 52 10-Gigabit Ethernet ports.

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

4 The entire 4094 VSAN ID space is supported.

5 This ASIC limit will only become significant in a future software release (when multiple virtual interfaces can be configured per Ethernet interface).

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

7 Each ASIC supports a TCAM with 2,000 entries, divided into multiple sections. Each section must have a minimum of 64 entries and can only increase in units of 64 entries. The software reserves the following: 128 entries for packet redirection to the Supervisor Engine; 64 entries for the two SPAN sessions; 1024 entries for VACL; 576 entries for PACL; 64 entries for QoS.

8 Each ASIC supports 256 counters to be shared among policers (ACL accounting, Fibre Channel Flow, etc.) Each counter can be configured to count either bytes or packets. A system-wide limit of 32 accounting entries for VACL or PACL is enforced.