Chapter 1. Overview

This guide contains the maximum verified scalability limits for ACI parameters for the Cisco APIC Release 2.3.1e and Cisco Nexus 9000 Series ACI-Mode Switches, Release 12.3.1e. 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 ACI fabric scale.

- General Scalability Limits

- Fabric Topology, SPAN, Tenants, Contexts, External EPGs, Bridge Domains, Endpoints, and Contracts Scalability Limits

- Multiple Fabric Options Scalability Limits

- VMM Scalability Limits

- Layer 4 - Layer 7 Scalability Limits

- AD, TACACS, RBAC Scalability Limits

- QoS Scalability Limits

General Scalability Limits

- L2 Fabric: In Legacy mode there is no routing, L3 context, nor contract enabled in the L2 fabric profile.  A tenant in this profile does not need to be mapped to one dedicated ACI tenant.  A tenant can be represented by a set of EPGs instead. To improve the load sharing among APIC controller nodes, you must distribute EPGs and BDs across an ACI tenant.

- L3 Fabric: The ACI L3 fabric solution provides a feature-rich highly scalable solution for public cloud and large enterprise. With this design, almost all supported features are deployed at the same time and are tested as a solution. The scalability numbers listed in this section are multi-dimensional scalability numbers. The fabric scalability numbers represent the overall number of objects created on the fabric. The per-leaf scale numbers are the objects created and presented on an individual leaf switch. The fabric level scalability numbers represent APIC cluster scalability and the tested upper limits. Some of the per-leaf scalability numbers are subject to hardware restrictions. The per-leaf scalability numbers are the maximum limits tested and supported by leaf switch hardware. This does not necessarily mean that every leaf switch in the fabric was tested with maximum scale numbers.

- Stretched Fabric: Stretched fabric allows multiple fabrics (up to 3) distributed in multiple locations to be connected as a single fabric with a single management domain. The scale for the entire stretched fabric remains the same as for a single site fabric. For example a L3 stretched fabric will support up to 200 leafs total which is the maximum number of leafs supported on a single site fabric. Parameters only relevant to stretched fabric are mentioned in the tables below.

- Multi-Pod: Multipod enables provisioning a more fault-tolerant fabric comprised of multiple pods with isolated control plane protocols. Also, multipod provides more flexibility with regard to the full mesh cabling between leaf and spine switches. For example, if leaf switches are spread across different floors or different buildings, multipod enables provisioning multiple pods per floor or building and providing connectivity between pods through spine switches.

Multipod uses a single APIC cluster for all the pods; all the pods act as a single fabric. Individual APIC controllers are placed across the pods but they are all part of a single APIC cluster.

NOTE: The maximum number of leaf switches overall is 400 per fabric scale and the maximum number of physical ports is 19,200 per fabric.

Feature

L2 Fabric

L3 Fabric

Large L3 Fabric

Number of APIC controllers

3

Minimum 3 (4 also supported)

5

Number of leaf switches

80

80

200

Number of spines

Maximum spines per pod: 6. Total spines 16.

Maximum spines per pod: 6. Total spines 16.

Maximum spines per pod: 6. Total spines 16.

Number of FEXs

N/A

20 FEXes per leaf, 320 FEX ports/leaf, 650 FEXes per fabric.

N/A

Number of tenants

N/A

1000

3000

Number of Layer 3 (L3) contexts

N/A

1000

3000

Number of contracts/filters

N/A

- 2000 contracts

- 10,000 filters

- 2000 contracts

- 10,000 filters

Number of endpoint groups (EPGs)

21,000 (500 maximum per tenant)

15,000 (500 maximum per tenant)

15,000 (500 maximum per tenant)

Number of Isolation enabled EPGs

250

250

250

Number of endpoints (EPs)

180,000

180,000

180,000

Number of bridge domains (BDs)

21,000

15,000

15,000

Number of IP longest prefix matches (IP LPMs) (for external connection)

Note

This limit exists across all protocols/transit scenarios

N/A

- IPv4; 40,000

- IPv6; 20,000

- Per Leaf IPv4 and IPv6; 10,000 total

- IPv4; 40,000

- IPv6; 20,000

- Per Leaf IPv4 and IPv6; 10,000 total

Number of BGP + number of OSPF sessions + EIGRP (for external connection)

N/A

1,200

1,200

Number of Multicast groups

N/A

8000

8000

Number of Multicast groups per VRF

N/A

8000

8000

Number of static routes to a single SVI/VRF

N/A

5,000

10,000

Number of static routes on a single leaf switch

N/A

5,000

10,000

Number of vCenters

N/A

- 200

- 50 AVS

- 200

- 50 AVS

Number of Service Chains

N/A

1000

1000

Number of L4 - L7 devices

N/A

30 physical, 1,200 virtual (1200 maximum per fabric)

30 physical, 1,200 virtual (1500 maximum per fabric)

Number of ESXi hosts - VDS

N/A

3200

3200

Number of ESXi hosts - AVS

N/A

3200 (Only 1 AVS instance per host)

3200 (Only 1 AVS instance per host)

Number of VMs

N/A

Depends upon server scale

Depends upon server scale

Number of configuration zones per fabric

30

30

30

Number of BFD sessions per leaf switch

256

Minimum BFD timer required to support this scale:

- minTx:50

- minRx:50

- multiplier:3

256

Minimum BFD timer required to support this scale:

- minTx:50

- minRx:50

- multiplier:3

256

Minimum BFD timer required to support this scale:

- minTx:50

- minRx:50

- multiplier:3

Multi-Pod

NOTE: * = preferred cluster size

3* or 4 node APIC cluster,6 pods, 80 leaf switches overall

3* or 4 node APIC cluster,6 pods, 80 leaf switches overall

- 5* or 6 node APIC cluster,6 pods, 200 leaf switches max per pod, 300 leaf switches max overall

- 7 node APIC cluster,10 pods, 200 leaf switches max per pod, 400 leaf switches max overall

L3 eVPN Services over Fabric WAN (with and without OpFlex)

N/A

1000 VRFs, 1000 L3outs, 60,000 routes in a fabric

1000 VRFs, 60,000 routes in a fabric

Layer 3 Multicast routes

N/A

8,000

8,000

Number of Routes in Overlay-1 VRF

1,000

1,000

1,000

Fabric Topology, SPAN, Tenants, Contexts, External EPGs, Bridge Domains, Endpoints, and Contracts Scalability Limits

Configurable Options

Per Leaf Scale

Per Fabric Scale

Fabric Topology

Number of PCs, vPCs

320 (with FEX HIF)

N/A

Number of encaps per access port, PC, vPC (non FEX HIF)

1750

N/A

Number of encaps per FEX HIF, PC, vPC

20

N/A

Number of member links per PC, vPC*

*vPC total ports = 16, 8 per leaf

8

N/A

Number of ports x VLANS (global scope and no FEX HIF)

64,000

168,000 (when using legacy BD mode)

N/A

Number of ports x VLANS (FEX HIFs and/or local scope)

For ALE v1 and v2: 9,000

For LSE and LSE2:

10,000

N/A

Number of static port bindings

For ALE v1 and v2: 30,000

For LSE and LSE2:

60,000

400,000

STP

All VLANs

N/A

Mis-Cabling Protocol (MCP)

256 VLANs per interface

2000 logical ports (port x VLAN) per leaf

N/A

Maximum number of endpoints (EPs)

For ALE v1 and v2:

- IPv4: 12,000 or

- IPv6: 6000 or

- IPv4: 4000, IPv6; 4000

For LSE and LSE2:

- MAC: 24,000

- IPv4: 24,000

- IPv6: 12,000

180,000

Number of MAC EPGs

N/A

125

Number of Multicast Groups

8000

8000

Number of Multicast Groups per VRF

8000

8000

Number of IPs per MAC

1024

1024

SPAN

ALE based ToRs:

- 4 uni-directional or 2 bi-directional access/tenant sessions

- 4 uni-directional or 2 bi-directional fabric sessions

LSE based ToRs:

- 8 uni-directional or 4 bi-directional sessions (fabric, access, or tenant)

N/A

Number of ports per SPAN session

- All leaf access ports could be in one session

- All leaf fabric ports could be in one session

NOTE: For LSE/LSE2 only: 30 (total number of unique ports (fabric + access) across all types of span sessions)

N/A

Number of source EPGs in tenant SPAN sessions

Note

The numbers listed in this row assume that only tenant SPAN is configured.

If both, Access and Tenant SPAN are configured, the following formula applies for both ingress and egress SPAN:

E + P + E*P + EPP + v6FePP + 0.5*v4FePP <= 230

Where:

- E— Number of source EPGs in Tenant SPAN

- P—Number of source Ports in access SPAN without any filters

- EPP—Number of (Epg,Port) Pairs in access SPAN with EPG filter only (no filter group)

- v4FePP—Number of (v4 filter entry, Port) Pairs in access SPAN with filter group

- v6FePP—Number of (v6 Filter entry, Port) Pairs in access SPAN with filter group

ALE-based ToR switches:

- 230 ingress direction + 50 egress direction

LSE-based ToR switches:

- 230 bidirectional

- 460 unidirectional (230 ingress + 230 egress)

N/A

Common pervasive gateway

256 virtual IPs per Bridge Domain

N/A

Maximum number of Data Plane policers

ALE:

- 64 ingress policers

- 64 egress policers

LSE and LSE2:

- 7 ingress policers

- 3 egress policers

N/A

Maximum number of SNMP trap receivers

10

10

Maximum number of Q-in-Q tunnels

(both QinQ core and edge combined)

1980

N/A

Maximum number of TEP-to-TEP atomic counters

N/A

1600

Tenants

Number of Contexts per tenant

50

50

Number of application profiles per tenant (or per Context)

N/A

N/A

Contexts (All numbers applicable to dual stack unless explicitly called out)

Maximum number of Context

400

N/A

Number of VRFs per tenant

N/A

50

Number of BDs per VRF

N/A

1750

Number of isolated EPGs

N/A

250

Border Leafs per L3 Out

N/A

8

Maximum number of LPM Prefixes for External EPG Classification

1000 IPv4

N/A

Maximum number of vzAny Provided Contracts

16 per Ctx

N/A

Maximum number of vzAny Consumed Contracts

16 per Ctx

N/A

Number of service graphs per device cluster

N/A

500

L3 Out per context

--

400

Maximum number of Routed, Routed Sub-interface, or SVIs per L3 Out

- 8 for Routed and Routed sub-interface

- 1000 for SVI

- 8 for Routed and Routed sub-interface

- 1000 for SVI

Maximum number of BGP neighbors

400

2400

Maximum number of BGP neighbors with authentication enabled

150

N/A

Maximum number of OSPF neighbors

300

(Maximum number of VRFs with an l3out where OSPF is the only routing protocol enabled, cannot exceed 142)

N/A

Maximum number of EIGRP neighbors

16

N/A

Maximum number of Static Routes

- IPv4; 10,000 or

- IPv6; 6000 or

- IPv4; 4000, IPv6; 4000

- IPv4; 40,000 or

- IPv6; 20,000 or

- IPv4; 10,000, IPv6; 10,000

Maximum number of External Routes

For ALE v1 and v2:

- IPv4; 10,000 or

- IPv6; 5000 or

For LSE and LSE2:

- IPv4; 20,000 or

- IPv6; 10,000

- IPv4; 40,000 or

- IPv6; 20,000 or

- IPv4; 10,000, IPv6; 10,000

Maximum number of Secondary addresses per logical interface

1

1

Maximum number of L3 interfaces per Context (SVIs and sub-interfaces)

- 200 for SVI

- 32 for subinterfaces

- 400 for SVI

- 32 for subinterfaces

Maximum number of ARP entries for L3 Outs

7500

N/A

Shared L3 Out

- IPv4: 2000 or

- IPv6: 1000

- IPv4: 6000 or

- IPv6: 3000

Configurable Options

per Leaf scale

per Fabric scale

Maximum number of L3 Outs

400 (per leaf scale)

2400 (single-stack)

1800 (dual-stack)

External EPGs

Number of External EPGs

600

2400 (single stack)

Number of External EPGs per L3 out

250

400

Bridge Domain

Maximum number of BDs

1750; if legacy mode, 3,500;

if Multicast optimized mode then 50

15,000

Maximum number of BDs with Unicast Routing per Context (VRF)

256

N/A

Maximum number of subnets per BD

512 (cannot be for all BDs)

512 per BD

Maximum number of EPGs per BD

3499 (cannot exceed 3,500 total)

3499 is supported in hardware but please refer to the per fabric scale for the effective software support for this release.

3499

Number of L2 Outs per BD

1

1

Number of BDs with Custom MAC Address

1750; if legacy mode, 3500;

If Multicast optimized mode is used, then 50

1750; if legacy mode, 3500;

If Multicast optimized mode is used, then 50

Number of Multicast groups

8000

8000

Maximum number of EPGs + L3 Outs per Multicast Group

128

128

Maximum number of BDs with L3 Multicast enabled

1750

1750

Maximum number of VRFs with L3 Multicast enabled

64

64

Maximum number of L3 Outs per BD

4

N/A

DHCP relay addresses per BD across all labels

16

N/A

Number of external EPGs per L2 out

1

1

Maximum number of PIM Neighbors

1000

1000

Maximum number of PIM Neighbors per VRF

64

64

Maximum number of L3Out physical interfaces with PIM enabled

32

N/A

Endpoint Groups (Under App Profiles)

Maximum amount of EPGs

Normally 1750; if legacy mode 3500

15,000

Maximum amount of encaps per EPG

1 Static leaf binding, plus 10 Dynamic VMM

N/A

Maximum Path encap binding per EPG

Equals to number of ports on the leaf

N/A

Maximum amount of encaps per EPG per port

One (path or leaf binding)

N/A

Maximum number of domains (physical, L2, L3)

- 10 static (L2, L3, physical)

- 10 dynamic

N/A

Maximum number of VMM domains

- 200 vDS

- 50 AVS

N/A

Maximum amount of native encaps

- 1 per port (if a VLAN is used as a native VLAN)

- If there is a different native VLAN per port then it equals the number of ports

Applicable to each leaf independently

Maximum amount of 802.1p encaps

- 1, if path binding then equals number of ports

- If there is a different native VLAN per port then it equals the number of ports

Applicable to each leaf independently

Can encap be tagged and untagged?

No

N/A

Maximum number of Static endpoints per EPG

Maximum endpoints

N/A

Maximum number of Subnets for Inter-context access per tenant

4000

N/A

Maximum number of Taboo Contracts per EPG

2

N/A

IP-based EPG

4000

N/A

Contracts

Security TCAM size

- 4000 (for ALE v1)

- 40,000 (for ALE v2)

- 61,000 (for LSE and LSE2)

Note

For TOR to ALE mapping, see the reference table below.

N/A

Approximate TCAM calculator given contracts and their use by EPGs

Number of entries in a contract X Number of Consumer EPGs X Number of Provider EPGs X 2

N/A

Maximum number of EPGs providing the same contract

25

25

Maximum number of EPGs consuming the same contract

25

25

FEX VPC

Maximum EPGs behind FEX VPC port

20

N/A

FCoE

Maximum number of VSAN

32

N/A

Maximum number of VFC

151

Note

This number includes VFCs configured on switch ports and FEX ports.

N/A

Maximum number of FDISC per port

96

N/A

Maximum number of FDISC per SB

96

N/A

ALE Type

ACI-Supported TORs

ALE v1

- N9K-C9396PX + N9K-M12PQ

- N9K-C93128TX + N9K-M12PQ

- N9K-C9396TX + N9K-M12PQ

ALE v2

- N9K-C9396TX + N9K-M6PQ

- N9K-C93128TX + N9K-M6PQ

- N9K-C9396PX + N9K-M6PQ

- N9K-C9372TX 64K

- N9K-C9332PQ

- N9K-C9372PX

LSE

N9K-C93108TC-EX + N9K-C93180YC-EX

LSE2

N9K-C93108TC-FX + N9K-C93180YC-FX

Multiple Fabric Options Scalability Limits

Configurable Options

Per Leaf Scale

Per Fabric Scale

Stretched Fabric

Maximum number of fabrics that can be a stretched fabric

N/A

3

Maximum number of Route Reflectors

N/A

6

Multi-Pod

Maximum number of PODs

N/A

10

Maximum number of nodes per POD

N/A

200

Maximum number of leaf switches overall

N/A

400

VMM Scalability Limits

Configurable Options

Per Leaf Scale

Per Fabric Scale

VMware

Number of vCenters (vDS)

N/A

200 (Verified with a load of 10 events/minute for each vCenter)

Number of vCenters (AVS)

N/A

50

Datacenters in a vCenter

N/A

2

Total number of (VMM domain, VMM controller (vCenter/vShield)) instances

N/A

- 200 vDS

- 50 AVS

Number of ESX hosts per AVS

240

N/A

Number of EPGs per vCenter/vDS

N/A

5,000

Number of EPGs to VMware domans/vDS

N/A

5,000

Number of EPGs per vCenter/AVS

N/A

3,500

Number of EPGs to VMware domains/AVS

N/A

3,500

Number of endpoints (EPs) per AVS

10,000

10,000

Number of endpoints per vDS

10,000

10,000

Number of endpoints per vCenter

10,000

10,000

Support RBAC for AVS

N/A

Yes

Support RBAC for vDS

N/A

Yes

Number of VM Attribute Tags per vCenter

N/A

vCenter version 6.0: 500

vCenter version 6.5: 1000

Microsegmentation/DFW with AVS

Number of ESX hosts per AVS

100

N/A

Number of Microsegment EPGs

1,000

N/A

Number of DFW flows per vEth

10,000

N/A

Number of DFW denied and permitted flows per ESX host

250,000

N/A

Number of VMM domains per Microsegment EPG

N/A

10

Microsoft

Number of controllers per SCVMM domain

N/A

5

Number of SCVMM domains

N/A

5

EPGs per Microsoft VMM domain

N/A

3,000

EPGs per all Microsoft VMM domains

N/A

9,000

EP/VNICs per HyperV host

N/A

100

EP/VNICs per SCVMM

N/A

3,000

Number of logical switch per host

N/A

1

Number of uplinks per logical switch

N/A

4

Number of Windows Azure Pack subscriptions

N/A

1,000

Number of plans per Windows Azure Pack instance

N/A

150

Number of users per plan

N/A

200

Number of subscriptions per user

N/A

3

VM networks per Windows Azure Pack user

N/A

100

VM networks per Windows Azure Pack instance

N/A

3,000

Number of tenant shared services/providers

N/A

40

Number of consumers of shared services

N/A

40

Number of VIPs (Citrix)

N/A

50

Number of VIPs (F5)

N/A

50

Microsoft microsegmentation

1,000

N/A

Layer 4 - Layer 7 Scalability Limits

Configurable Options

(L4-L7 Configurations)

Per Leaf Scale

Per Fabric Scale

Maximum number of L4-L7 logical device clusters

N/A

1,500

Maximum number of graph instances

N/A

1,000

Maximum number of VIPs per graph instance

N/A

1

Number of device clusters per tenant

N/A

30

Number of interfaces per device cluster

N/A

Any

Number of graph instances per device cluster

N/A

500

Deployment scenario for ASA (transparent or routed)

N/A

Yes

Deployment scenario for Citrix - One arm with SNAT/etc.

N/A

Yes

Deployment scenario for F5 - One arm with SNAT/etc.

N/A

Yes

AD, TACACS, RBAC Scalability Limits

Configurable Options

Per Leaf Scale

Per Fabric Scale

Number of ACS/AD/LDAP authorization domains

N/A

4 tested (16 maximum /server type)

Number of login domains

N/A

15 (can go beyond)

Number of security domains/APIC

N/A

15 (can go beyond)

Number of security domains in which the tenant resides

N/A

4 (can go beyond)

Number of priority

N/A

4 tested (16 per domain)

Number of shell profiles that can be returned

N/A

4 tested (32 domains total)

Number of users

N/A

8,000 local / 8,000 remote

Number of simultaneous logins

N/A

500 connections / NGNIX simultaneous REST logins

QoS Scalability Limits

The table below shows QoS scale limits. The scale numbers depend on whether remote leafs are present in the topology as well as MPOD QoS Policy and CoS Preservation settings.

QoS Scale

MPOD QoS Policy enabled

Custom QOS Policy with DSCP

9

Custom QOS Policy with DSCP and Dot1P

9

Custom QOS Policy with Dot1P

48

Custom QOS Policy via a Contract

48

CoS Preservation enabled

Custom QOS Policy with DSCP

9

Custom QOS Policy with DSCP and Dot1P

9

Custom QOS Policy with Dot1P

48

Custom QOS Policy via a Contract

48

Notices