Introduction

This document describes the Cisco Nexus® configuration limits for Cisco Nexus® 3550-T switches.

The values provided in this guide should not be interpreted as theoretical system limits for Cisco NX-OS 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.


Note


The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product.

Verified Scalability Limits - Unidimensional

The tables in this section list the verified scalability limits for the Cisco Nexus® 3550-T switches for Cisco NX-OS Release: 10.2(3v).

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

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

Table 1. Cisco Nexus® 3550-T Precision Time Protocol Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

Maximum ports with PTP

48

Maximum PTP sessions per port

2

Table 2. Cisco Nexus® 3550-T Interfaces Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

DHCP clients per switch

1

1 DHCP client (on management port only)

Port channel

24

Note

 

A maximum of 4 port channels per port group.

SVIs

255 (1 SVI is reserved)

Static Network Address Translation (NAT)

1024 rules

6144 hardware entries

1 DHCP supported only on management port along with POAP.
Table 3. Cisco Nexus® 3550-T Layer 2 Switching Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

MAC addresses

SMAC table: 1480 (per quad)

DMAC table: 1480 (per quad)

2

MST instances

64

VLANs

255

2 Layer 2 unidimensional scale only.
Table 4. Cisco Nexus® 3550-T Multicast Routing Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

Outgoing interfaces (OIFs)

40 (SVI + physical layer 3) or 47 (only on Access port or physical layer 3)

IGMP snooping groups

768

3

PIM neighbors

48

Maximum number of Multicast routes

5400

3 Hardware table is shared with the DMAC table.
Table 5. Cisco Nexus® 3550-T Security Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

ACLs

Ingress - 1024 IPv4


Note


Only 62 unique ACLs can be configured. Each ACL takes one label. If the same ACL is configured on multiple interfaces, the same label is shared. If each ACL has unique entries, the ACL labels are not shared, and the label limit is 62.


Table 6. Cisco Nexus® 3550-T Unicast Routing Verified Scalability Limits (Unidimensional)

Feature

Verified Limits

Unicast Routing

BGP neighbors

48 (IPv4)

IPv4 ARP

4950

(2475 per quad; 4950 system scale)

IPv4 host routes 4

5400

IPv4 VLSM Routes

1350

OSPF areas

5 areas

OSPFv2 neighbors

6

Static routes

512 System scale

VRRP groups per interface or I/O module

(1 VRRP group per interface, 200 VRRP groups systemwide)

4 Please note that not all route distributions can fit in the Cisco Nexus® 3550-T hardware. The hash table is subject to collisions. Depending on the host route pattern, collisions might occur.

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 scale value may vary when combined with other parameters.

  • The graceful restart timeout value can be increased in multidimensional scenarios.

Verified Scalability Limits - Multidimensional

The tables in this section list the verified scalability limits for the Cisco Nexus® 3550-T switch for Cisco NX-OS Release: 10.2(3t). These limits are validated with a multidimensional configuration. The values provided in these tables focus on the scalability of all listed features at the same 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 may increase this verified maximum limit. Results may differ from the values that are listed here when trying to achieve maximum scalability with multiple features enabled.


Attention


These numbers are not the maximum verified values if each feature is viewed in isolation. For these numbers, see the "Verified Scalability Limits - Unidimensional" section.
Table 7. Cisco Nexus® 3550-T eBGP/OSPF Profile Verified Scalability Limits (Multidimensional)

Feature

Verified Limits

Number of 10G ports

48

BGP neighbors

48

BGP IPv4 /32 unicast routes

1000

BGP IPv4 VLSM unicast routes

500

OSPFv2 neighbors

6

OSPF IPv4 /32 unicast routes

1600

PIM neighbors

48

ACL ACEs

850

Table 8. Cisco Nexus® 3550-T iBGP/OSPF Profile Verified Scalability Limits (Multidimensional)

Feature

Verified Limits

BGP neighbors

48

BGP + OSPF IPv4 unicast routes

1000

OSPFv2 neighbors

6

OSPF IPv4 /32 unicast routes

1600

PIM neighbors

48

IPv4 (*,G) multicast routes

6000

ACL ACEs

850 (IPv4)

Table 9. Cisco Nexus® 3550-T Layer 2/Layer 3 Boundary Verified Scalability Limits (Multidimensional)

Feature

Verified Limits

MAC addresses

690

OSPFv2 neighbors

6

OSPF IPv4 /32 unicast routes

1000

VLAN

200

SVI

200

VRRP v4 groups

200 VRRP

PIM neighbors

200

IPv4 (*,G) multicast routes

6000

IGMP snooping database entries

400

vPC port channel

11

VRF

63 (total), details as below:

  • non-default - 61

  • default - 1

  • management - 1

SPAN

24

STP Logical Ports (PVRSTP)

1400 (physical ports x VLAN)