Introduction

This document describes the Cisco NX-OS configuration limits for Cisco Nexus 3400-S Series switches.

The values provided in this guide should not be interpreted as theoretical system limits for Cisco Nexus 3400-S Series hardware or Cisco NX-OS software. These limits refer to values that have been validated by Cisco. They can increase over time as more testing and validation is done.

Verified Scalability Limits - Unidimensional

The tables in this section list the verified scalability limits for the Cisco Nexus 3400-S Series switches for Cisco NX-OS Release 9.2(2t).

These limits are validated with a unidimensional configuration. The values provided in these tables focus on the scalability of one particular feature at a time.

Each number is the absolute maximum currently supported by this Cisco NX-OS release for the corresponding feature. If the hardware is capable of a higher scale, future software releases might increase this verified maximum limit. Results might differ from the values listed in this guide when you try to achieve maximum scalability with multiple features enabled.


Note
If a feature is not supported for a particular platform, the verified limit is not provided.
Table 1. HSRP Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

Number of groups per interface or I/) module

Nexus 3408-S

Maximum 16 (Because 16 is the unique virtual MAC address limit)

Table 2. Interfaces Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

DHCP clients per switch

Nexus 3408-S

10 (IPv4) + 10 (IPv6)

IP DHCP relay addresses (helper addresses) per switch

Nexus 3408-S

32 (IPv4) + 32 (IPv6)

MAC address - table system, VLAN limit

Nexus 3408-S

4,095

Port channel links

Nexus 3408-S

32

SVIs

Nexus 3408-S

1,000

vPCs

Nexus 3408-S

80

Table 3. Layer 2 Switching Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

MAC addresses table

Nexus 3408-S

32,000

MST instances

Nexus 3408-S

64

MST PV count with single instances 0

Nexus 3408-S

190,000

MST virtual ports

Nexus 3408-S

48,000

RPVST virtual ports

Nexus 3408-S

12,000

Members per Port Channel

Nexus 3408-S

32

Max Port Channels

Nexus 3408-S

100

Spanning tree instances

Nexus 3408-S

123

Total number of VLANs × ports with switchport isolated (3967 VLANs x 48 ports)

Nexus 3408-S

190,000

VLANs

Nexus 3408-S

4095 (range 1-4095)

VLANs in RPVST mode

Nexus 3408-S

123

Note
The number of supported VLANs per vPC should be within the MST or RPVST virtual port count specified in this table, depending on the topology.
Table 4. Layer 3 Switching Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

MAC addresses

Nexus 3408-S

Profile A: 44,000

Profile D: 20,000

IPv4 Unicast (hosts) routes

Nexus 3408-S

Profile A: 96,000

Profile D: 48,000

IPv4 Unicast (prefixes)

Nexus 3408-S

Profile A: 72,000

Profile D: 200,000

IPv6 Unicast (hosts) routes

Nexus 3408-S

Profile A: 48,000

Profile D: 24,000

IPv6 Unicast (prefixes < = /64)

Nexus 3408-S

Profile A: 36,000

Profile D: 100,000

IPv6 Unicast (prefixes /65 to /127)

Nexus 3408-S

Profile A: 128

Profile D: 128
Table 5. QoS Verified Scalability Limits (Unidimensional

Feature

Supported Platform

Verified Limits

Ingress L3 QoS TCAM entries

Nexus 3408-S

256 (320 bit wide)

Ingress L2 QoS TCAM entries

Nexus 3408-S

256 (320 bit wide)
Table 6. Security Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

Egress ACLs

Nexus 3408-S

1500 and 80 bits wide

System ACLs

Nexus 3408-S

256 and 320 bits wide TCAM entries

DHCP snooping bindings

Nexus 3408-S

2,048

IPv4 ingress access control entries (ACEs)

Nexus 3408-S

  • RACL IPv4: 1024 TCAM entries in internal TCAM

  • PACL MAC: 1024 TCAM entries in internal TCAM

  • PACL IPv4: 1024 TCAM entries in internal TCAM

IPv6 ingress access control entries (ACEs)

Nexus 3408-S

  • PACL IPv6: 512 TCAM entries in internal TCAM

  • RACL IPv6: 512 TCAM entries in internal TCAM

IPv4 ingress TCAM entries

Nexus 3408-S

1024

IPv4 egress TCAM entries

Nexus 3408-S

512

IPv6 ingress TCAM entries

Nexus 3408-S

512

IPv6 egress TCAM entries

Nexus 3408-S

256

Note
The TCAM entries scalability limits also apply to policy-based TCAM entries (PBACLs).
Table 7. System Management Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

sFlow

sFlow ports

Nexus 3408-S

64

SPAN and ERSPAN

Configurable SPAN or ERSPAN sessions

Nexus 3408-S

32

Active SPAN or ERSPAN sessions

Nexus 3408-S

4

Active localized SPAN or ERSPAN session (Rx and Tx, Rx, or Tx)

Nexus 3408-S

4

Source interfaces per SPAN or ERSPAN session (Rx and Tx, Rx, or Tx)

Nexus 3408-S

32 (tentatively)

Destination interfaces per SPAN session

Nexus 3408-S

1 (physical)

Source VLANs per SPAN or ERSPAN session

Nexus 3408-S

32
Table 8. Unicast Routing Verified Scalability Limits (Unidimensional)

Feature

Supported Platform

Verified Limits

Unicast Routing

BFD sessions (echo mode)

Nexus 3408-S

128

BGP neighbors

Nexus 3408-S

512 (IPv4), 512 (IPv6), or 256 (IPv4 + IPv6)

EIGRP routes

Nexus 3408-S

20, 000

EIGRP neighbors

Nexus 3408-S

256

HSRP groups

Nexus 3408-S

1000

IPv4 ARP

Nexus 3408-S

32,000

IPv6 ND

Nexus 3408-S

32,000 (default), 16,000 (lpm heavy)

IS-ISv4 adjacencies (either L1, L2, or sum of L1 and L2 with default timers)

Nexus 3408-S

255

IS-ISv4 BFD sessions (with default timers)

Nexus 3408-S

255

IS-ISv4 routes

Nexus 3408-S

10,000

IS-ISv4 network type

Nexus 3408-S

Point to point, broadcast

OSPF/OSPFv3 LSA/LSDB size

Nexus 3408-S

250, 000

OSPF/OSPFv3 areas

Nexus 3408-S

15

OSPFv2 neighbors

Nexus 3408-S

1,000

OSPFv3 neighbors

Nexus 3408-S

1000

OSPF/OSPFv3 LSA/LSDB size

Nexus 3408-S

100,000

OSPF/OSPFv3 areas

Nexus 3408-S

100

VRFs

Nexus 3408-S

256

VRRP groups per interface or I/O module

Nexus 3408-S

250

VRRPv3

VRRPv3 groups per interface

Nexus 3408-S

255

VRRPv3 groups with default timers (1 s)

Nexus 3408-S

490

VRRPv3 groups with relaxed timers (3 s)

Nexus 3408-S

490

Pathways with one VRRPv3 group with default timer (1 s)

Nexus 3408-S

489

VRRPv3 groups and pathways combined

Nexus 3408-S

490

Guidelines and Limitations for OSPF Verified Scalability Limits

  • To achieve the highest scale, we recommend that you use a single OSPF instance instead of multiple instances.

  • Each OSPFv2 and OSPFv3 scale value might vary when combined with other parameters.

  • The graceful restart timeout value might need to be increased in multi-dimensional scenarios.