CISCO 3550-T NX-OS Programmable Switch Platform User Guide

Cisco Nexus 3550-T NX-OS Verified Scalability Guide, Release 10.5(3)F
Preface ii Audience ii Document Conventions ii Related Documentation for Cisco Nexus 3550-T Triton Switches iii Documentation Feedback iii Communications, Services, and Additional Information iii
Introduction 4 Verified Scalability Limits – Unidimensional 4 Verified Scalability Limits – Multidimensional 6

Preface
Audience
This publication is for network administrators who install, configure, and maintain Cisco Nexus switches.

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.

Document Conventions

Command descriptions use the following conventions:

Convention bold

Description Bold text indicates the commands and keywords that you enter literally as shown.

Italic

Italic text indicates arguments for which you supply the values.

[x]

Square brackets enclose an optional element (keyword or argument).

[x | y]

Square brackets enclosing keywords or arguments that are separated by a vertical bar indicate an optional choice.

{x | y}

Braces enclosing keywords or arguments that are separated by a vertical bar indicate a required choice.

[x {y | z}]

Nested set of square brackets or braces indicate optional or required choices within optional or required elements. Braces and a vertical bar within square brackets indicate a required choice within an optional element.

variable

Indicates a variable for which you supply values, in context where italics cannot be used.

Convention string

Description
A nonquoted set of characters. Do not use quotation marks around the string or the string includes the quotation marks.

Examples use the following conventions:

Convention
screen font

Description Terminal sessions and information the switch displays are in screen font.

boldface screen font

Information that you must enter is in boldface screen font.

italic screen font

Arguments for which you supply values are in italic screen font.

Nonprinting characters, such as passwords, are in angle brackets.

[]

Default responses to system prompts are in square brackets.

!, #

An exclamation point (!) or a pound sign (#) at the beginning of a line of code indicates

a comment line.

Related Documentation for Cisco Nexus 3550-T Triton Switches
The entire Cisco Nexus 3550-T Triton switch documentation set is available at the following URL: http://www.cisco.com/en/US/products/ps13386/tsd_products_support_series_home.html
Documentation Feedback
To provide technical feedback on this document, or to report an error or omission, please send your comments to nexus9k-docfeedback@cisco.com. We appreciate your feedback.
Communications, Services, and Additional Information
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iii

Revised: April 24, 2025
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.

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 10.5(3)F.
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 Maximum ports with PTP Maximum PTP sessions per port

Verified Limits 48 2

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

Feature
DHCP clients per switch
1

Verified Limits 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)

Feature

Verified Limits

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 MAC addresses

Verified Limits SMAC table: 1480 (per quad) DMAC table: 1480 (per quad)
2

MST instances

VLANs

255

2 Layer 2 unidimensional scale only.

Table 4: Cisco Nexus® 3550-T Multicast Routing Verified Scalability Limits (Unidimensional)

Feature Outgoing interfaces (OIFs)
IGMP snooping groups

Verified Limits
40 (SVI + physical layer 3) or 47 (only on Access port or physical layer 3)
768
3

PIM neighbors

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 ACLs

Verified Limits 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 IPv4 host routes 4

4950 (2475 per quad; 4950 system scale) 5400

IPv4 VLSM Routes

1350

OSPF areas

5 areas

OSPFv2 neighbors

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 switches. 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 Number of 10G ports

Verified Limits 48

Feature BGP neighbors BGP IPv4 /32 unicast routes BGP IPv4 VLSM unicast routes OSPFv2 neighbors OSPF IPv4 /32 unicast routes PIM neighbors ACL ACEs

Verified Limits 48 1000 500 6 1600 48 850

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

Feature BGP neighbors BGP + OSPF IPv4 unicast routes OSPFv2 neighbors OSPF IPv4 /32 unicast routes PIM neighbors IPv4 (*,G) multicast routes ACL ACEs

Verified Limits 48 1000 6 1600 48 6000 850 (IPv4)

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

Feature MAC addresses OSPFv2 neighbors OSPF IPv4 /32 unicast routes VLAN SVI VRRP v4 groups PIM neighbors IPv4 (*,G) multicast routes IGMP snooping database entries

Verified Limits 690 6 1000 200 200 200 VRRP 200 6000 400

Feature vPC port channel VRF
SPAN STP Logical Ports (PVRSTP)

Verified Limits 11 63 (total), details as below:
· non-default – 61 · default – 1 · management – 1
24 1400 (physical ports x VLAN)

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Documents / Resources

CISCO 3550-T NX-OS Programmable Switch Platform [pdf] User Guide
3550-T, 3550-T NX-OS Programmable Switch Platform, NX-OS Programmable Switch Platform, Programmable Switch Platform, Switch Platform

References

User Manual

CISCO 3550-T NX-OS Programmable Switch Platform User Guide

3550-T NX-OS Programmable Switch Platform

Specifications

Product Usage Instructions

Installation

Configuration

Maintenance

FAQ

Q: Where can I find the complete documentation for Cisco Nexus
3550-T Triton Switches?

Q: How can I provide feedback on the documentation or report
errors?

Q: What are the verified scalability limits mentioned in the
manual?

Documents / Resources

References

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