Verified Scalability Limits

This chapter describes the Cisco NX-OS configuration limits for the Cisco Nexus 3164Q switch.

Introduction

The values provided in this guide should not be interpreted as theoretical system limits for Cisco Nexus 3164Q 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 unidimensional verified scalability limits for Cisco NX-OS Release 6.1(2)I3(1) on the Cisco Nexus 3164Q switch. 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 here when trying to achieve maximum scalability with multiple features enabled.

Table 1. Interfaces Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

BFD sessions

250

Port channel links

32

SVIs

250

vPCs

60

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

Feature

3164Q Verified Limit

MST instances

64

MST virtual ports

48,000

RPVST virtual ports

12,000

VLANs

3900

VLANs in RPVST mode

500


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 3. Multicast Routing Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

IPv4 multicast routes

32,000

Outgoing interfaces (OIFs)

40 (see CSCum58876)

IGMP snooping groups

32,000

PIM neighbors

250


Note

The IPv4 multicast routes and the IPv4/IPv6 host routes share the same hardware table. Limits are provided for both the default line card mode and the max host line card mode.


Note
High availability (graceful restart and stateful switchover) is not supported when unicast or multicast aggressive timers are configured at any scale.
Table 4. Security Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

IPv4 ingress ACLs

3070 (per network forwarding engine)

IPv4 egress ACLs

765 (per network forwarding engine)

IPv6 ingress ACLs

1530 (per network forwarding engine)

IPv6 egress ACLs

250 (per network forwarding engine)

Table 5. System Management Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

Configurable SPAN or ERSPAN sessions

4

Active SPAN or ERSPAN sessions1

4

Active localized SPAN or ERSPAN sessions per line card2

4

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

48

Destination interfaces per SPAN session

1 (physical interface)

Source VLANs per SPAN or ERSPAN session

32

1 A single forwarding engine instance supports four SPAN or ERSPAN sessions. If the first three sessions have bidirectional sources, the fourth session might have hardware resources only for Rx sources, depending on the SPAN or ERSPAN source's forwarding engine instance mappings.
2 The number of SPAN or ERSPAN sessions per line card reduces to two if the same interface is configured as the bidirectional source in more than one session.
Table 6. Unicast Routing Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

eBGP

1000

HSRP groups per interface or I/O module

250

IPv4 ARP

48,000

IPv4 host routes

88,000

IPv6 host routes

20,000

IPv6 ND

30,000

IPv4 unicast routes (LPM)

128,000

IPv6 unicast routes (LPM)

16,000

MAC addresses

80,000

OSPFv2 neighbors

200

OSPFv3 neighbors

200

VRRP groups per interface or I/O module

250

VRFs

1000

Policy-based routing (PBR)

Number of configured sequences per policy

256

Number of next-hop addresses per policy

32

Number of IPv4 ACEs (unidimensional)

3072 (per network forwarding engine)

Number of IPv6 ACEs (unidimensional)

1536 (per network forwarding engine)

Number of IPv4 and IPv6s ACEs

2048 IPv4 + 256 IPv6

Number of interfaces with PBR policy

512


Note

The IPv4 and IPv6 unicast routes share the same hardware table. Limits are provided for both the default line card mode and the max host line card mode.


Note

The IPv4/IPv6 host routes and the IPv4 multicast routes share the same hardware table. Limits are provided for both the default line card mode and the max host line card mode.


Note
High availability (graceful restart and stateful switchover) is not supported when unicast or multicast aggressive timers are configured at any scale.

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 multidimensional scenarios.
Table 7. VXLAN Verified Scalability Limits (Unidimensional)

Feature

3164Q Verified Limit

Virtual network identifiers (VNIs) or VXLAN-mapped VLANs

1000

Overlay multicast groups

128

Overlay MAC addresses

64,000

Remote VXLAN tunnel endpoints (VTEPs)

256