New and Changed Information

The following table provides an overview of the significant changes to the organization and features in this guide from the time the guide was first published to the latest update.

Table 1. Latest Updates

Date

Changes

January 25, 2021

First release of this document.

Overview

This guide contains the maximum verified scalability limits for Cisco Multi-Site.

These values are based on a profile where each feature was scaled to the numbers specified in the tables. These numbers do not represent the theoretically possible scale.


Note

The total number of objects within each site must not exceed the maximum verified scalability limit for that fabric version. For more information on site-specific scalability limits, see the Cisco ACI Verified Scalability Guide or Cisco DCNM Verified Scalability Guide for that fabric version.


Stretched Vs. Non-Stretched

Stretched in Cisco Multi-Site means that the fabric has stretched objects such as EPGs, BDs, VRFs, or subnets across multiple sites or has cross-site contracts between EPGs.

Non-stretched means all objects such as EPGs, contracts, and BDs, are local to one site only and do not cross the local-site boundary.

The total number of stretched and non-stretched objects must not exceed the maximum verified scalability limit for that object, which are listed in their respective sections in this guide.


Note

For maximum scale Multi-Site configurations with many features enabled simultaneously, we recommend that those configurations be tested in a lab before deployment.


ACI Fabrics Scalability Limits

This release supports managing only DCNM fabrics or only ACI fabrics by the same Multi-Site Orchestrator. The following scale limits apply when managing ACI fabrics.

General Scalability Limits

Object

Scale

Sites

12

Pods per site

12

Leaf switches per site

400 in a single pod

500 across all pods in Multi-Pod fabrics

Total leaf switches across all sites

Sites * Leaf switches per site

For example, 6000 if every site is deployed as a Multi-Pod fabric.

Multi-Site Orchestrator Objects Scale

Object

Scale

Policy Objects per Schema

1000

Templates per Schema

10

Number of Schemas

80

Contract Preferred Group (BD/EPG combinations)

500

Multi-Site Orchestrator Users (nonparallel*)

*Multi-Site Orchestrator processes requests sequentially from multiple users even if they are deploying different schemas.

50

Stretched Objects Scale

Object

Scale (Stretched)

Tenants

400

VRFs

1000

BDs

4000

Contracts

4000

Endpoints

150,000 including:

  • 100,000 - learned from other sites

  • 50,000 - locally learned in site-local

EPGs

4000

Isolated EPGs

400

Microsegment EPGs

400

IGMP Snooping

8000

Layer-3 multicast routes

8000

L3Out external EPGs

500

Subnets

8000

Number of L4-L7 logical devices

400

Number of graph instances

250

Number of device clusters per tenant

10

Number of interfaces per device cluster

Any

Number of graph instances per device cluster

125

VRF/BD VNID Translation Scale

Object

Scale

Fixed spines

21,000

Modular spines

42,000

DCNM Fabrics Scalability Limits

This release of Multi-Site Orchestrator supports managing only DCNM fabrics or only ACI fabrics by the same Multi-Site Orchestrator. The following scale limits apply when managing DCNM fabrics.

General Scalability Limits

Object

Scale

Sites

6

Leaf switches per site

150 per DCNM fabrics

350 per DCNM instance

900 total

Border Gateways per site

4

Multi-Site Orchestrator Objects Scale

Object

Scale

Policy Objects per Schema

1000

Templates per Schema

10

Number of Schemas

80

Multi-Site Orchestrator Users (nonparallel*)

*Multi-Site Orchestrator processes requests sequentially from multiple users even if they are deploying different schemas.

50

Stretched Objects Scale

Object

Scale (Stretched)

VRFs

500

Networks

1000 (L3)

1500 (L2)