CISCO Multi Site Verified Scalability User Guide
- June 15, 2024
- Cisco
Table of Contents
CISCO Multi Site Verified Scalability
Product Information
Specifications
- Product Name: Cisco Multi-Site Verified Scalability Guide
- Release Version: 3.2(1)
Overview
The Cisco Multi-Site Verified Scalability Guide provides information on the maximum verified scalability limits for Cisco Multi-Site. These limits are based on a profile where each feature was scaled to the specified numbers. It is important to note that these numbers do not represent the theoretically possible scale.
The guide also mentions that the total number of objects within each site must not exceed the maximum verified scalability limit for that fabric version. For site-specific scalability limits, users should refer to the Cisco ACI Verified Scalability Guide or Cisco DCNM Verified Scalability Guide for the respective fabric version.
ACI Fabrics Scalability Limits
This release of the product supports managing either DCNM fabrics or ACI
fabrics using the same Multi-Site Orchestrator. The following scalability
limits apply when managing ACI fabrics:
- General Scalability Limits:
- Object Sites: 12
- Pods per site: 12
- Leaf switches per site: 400 in a single pod
- Total leaf switches across all sites: 500 across all pods in Multi-Pod fabrics
- *Sites Leaf switches per site:** For example, 6000 if every site is deployed as a Multi-Pod fabric.
- Object Endpoints Scale: Not specified
- Multi-Site Orchestrator Objects Scale:
- Object Scale: Not specified
- Number of Schemas: 80
- Templates per Schema: 10
- Application Profiles per Schema: 200
- Policy Objects per Schema: 1000
- Contract Preferred Group (BD/EPG combinations): 500
- *Multi-Site Orchestrator Users (nonparallel):** 50
Multi-Site Orchestrator processes requests sequentially from multiple users even if they are deploying different schemas.
MSO-Deployed Objects Scale
The following table captures the maximum number of objects that MSO (Multi-
Site Orchestrator) can deploy in a given site, including the sum of all three
kinds of objects:
| Kind of Object | Maximum Number of Objects |
|---|---|
| Objects defined on APIC locally | Not specified |
| Objects pushed from MSO to the site (MSO-deployed objects) | Not specified |
Sum of objects locally defined on APIC and MSO-deployed
objects| Not specified
The Verified Scalability Guide for Cisco APIC provides information on the maximum number of objects supported in a given fabric. The sum of objects locally defined on APIC and the objects pushed from MSO to that site must not exceed the maximum number of objects supported.
FAQ
-
What are the scalability limits for managing DCNM fabrics?
The user manual does not provide specific scalability limits for managing DCNM fabrics. Users are advised to refer to the Cisco DCNM Verified Scalability Guide for more information. -
What is the significance of the “Preferred Group” in the Contract Preferred Group (BD/EPG combinations) scalability limit?
The “Preferred Group” represents the number of EPGs that are part of the Preferred Group, which can be deployed in each site. The maximum number of EPGs in the Preferred Group that can be managed by a single Nexus Dashboard Orchestrator instance can range from 500 (if all the EPGs are stretched) to 500*12 if only site-local EPGs are defined in each site. -
How does Multi-Site Orchestrator handle requests from multiple users?
Multi-Site Orchestrator processes requests sequentially from multiple users, even if they are deploying different schemas.
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.
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.
Endpoints| 150,000 including:
• 100,000 – learned from other sites
• 50,000 – locally learned in site-local
---|---
Multi-Site Orchestrator Objects Scale
| Object | Scale |
|---|---|
| Number of Schemas | 80 |
| Templates per Schema | 10 |
| Application Profiles per Schema | 200 |
| Policy Objects per Schema | 1000 |
| Contract Preferred Group (BD/EPG combinations) | 500 |
This value represents the number of EPGs that are part of the Preferred Group (across all the defined VRFs) that can be deployed in each site. This means that the maximum number of EPGs in the Preferred Group that can be managed by a single Nexus Dashboard Orchestrator instance can range from 500 (if
all the EPGs are stretched) to 500*12 if only site-local EPGs are defined in each site.
Multi-Site Orchestrator Users (nonparallel*)
*Multi-Site Orchestrator processes requests sequentially from multiple users even if they are deploying different schemas.
| 50
MSO-Deployed Objects Scale
To better understand the scalability values captured in the following table,
it is important to clarify that there are three kind of MSO-deployed objects:
- Site local objects —these are the objects defined in templates associated to a single site, which get deployed by MSO only in that specific site.
- Shadow objects:— these are the objects deployed by MSO in a site as a result of a contract established between site-local and remote objects, they are the representation (“shadow)” of the remote object in the local site.
- Stretched objects— these are the objects defined in templates that are associated to multiple sites, which get deployed by MSO concurrently on all those sites.
The table below captures the maximum number of objects that MSO can deploy in a given site and includes the sum of all three kinds of objects described above. For example, if you have two sites and you define three templates on MSO—template-1associated to site-1, template-2associated to site-2, and template-stretched associated to both site-1 and site-2—then:
- If you configure and deploy EPG-1 in template-1, this will count as one EPG towards the maximum allowed for site-1.
- If you configure and deploy EPG-2 in template-2, this will count as one EPG towards the maximum allowed for site-2.
- If you apply a contract between EPG-1 and EPG-2 or add both EPGs to the Preferred Group), a shadow EPG-2 will be created in site-1 and a shadow EPG-1 in site-2. As a result, two EPGs will now be counted towards the maximum allowed in each site.
- Finally, if you configure and deploy EPG-3in template-stretched, it will count as another EPG in each site, bringing the total to 3 EPGs towards the maximum allowed scale.
It is worth adding that the maximum number of objects supported in a given fabric (and captured in the Verified Scalability Guide for Cisco APIC) must not exceed the sum of objects locally defined on APIC plus the objects pushed from MSO to that site (MSO-deployed objects).
Note
For maximum-scale Multi-Site configurations with many features enabled
simultaneously, we recommend that those configurations be tested in a lab
before deployment.
| Object | Scale (Stretched) |
|---|---|
| Tenants | 400 |
| VRFs | 1000 |
| BDs | 4000 |
| Contracts | 4000 |
| EPGs | 4000 |
| Isolated EPGs | 400 |
| Microsegment EPGs | 400 |
| 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 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 fabric and 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
MSO-Deployed Objects Scale
When MSO manages DCNM fabrics, there is no concept of “shadow” objects. Hence,
the scalability values captured in the table below only refer to the sum of
site-local and stretched objects deployed by MSO in a given site.
| Object | Scale per Site |
|---|---|
| VRFs | 500 |
| Networks | 1000 (L3) |
1500 (L2)
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