CISCO NX-OS Software

Specifications:

• Product: Cisco Nexus 3000 Series
• Software: NX-OS Release 9.3(12)

Product Information:
The Cisco Nexus 3000 Series NX-OS Verified Scalability Guide provides validated scalability limits for supported platforms. These values have been verified by Cisco and may increase over time with additional testing.

Usage Instructions

Layer 2 Switching:
The Nexus 34180YC supports the following:

• 4K MSTP, 4K RSTP (Generic Profile Mode)
• 4K MSTP, 1K RSTP (L3 Heavy Profile Mode)
• 507 RSTP and 4K MSTP (Generic Profile Mode)
• 507 RSTP and 2K MSTP (L3 Heavy Profile Mode)
• MAC Address Table: 32K (Generic Profile Mode), 4K (L3 Heavy Profile Mode)

Layer 3 Switching:
The Nexus 34180YC supports the following:

• ARP IPv4 LPM: Maximum 32,768; Verified 32,000
• IPv4 hosts: Maximum 4,096; Verified 4,000
• Nhop ECMP: Maximum 17,408; Verified 15,500 (90% hash collision)

Unicast Routing:
The Nexus 3000 series supports various models with different capabilities for VLANs per switch and BFD/BFDv6 neighbors.

Introduction

The values provided in this guide should not be interpreted as theoretical system limits for Cisco Nexus 3000 Series 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

• The tables in this section list the Cisco verified scalability limits for Cisco NX-OS Release 9.3(12).
• These limits are validated with a unidimensional configuration. The values provided in these tables focus on the scalability of one particular feature at a 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 might increase this verified maximum limit.
• Results might differ from the values listed here when trying to achieve maximum scalability with multiple features enabled.

Note

1. Verified limits are provided only for supported platforms.
2. If a feature is not supported for a particular platform, the verified limit is not provided.
3. If the verified maximum values are exceeded in an ALPM or a non-ALPM mode, you get a table full syslog even in the hash collision scenario.
4. For Verified Maximum, 16 path ECMP is tested with 40K IPv4 and 40K IPv6.
5. If your scale requirements exceed either the Verified Topology or the Verified Maximum limit, please contact your Cisco representative. Based on your requirements, it may be possible to validate support for your requirement, as long as the scale capability of the hardware is not exceeded.

Table 1: Layer 2 Switching Verified Scalability Limits (Unidimensional)

Table 2: Layer 3 Switching Verified Scalability Limits (Unidimensional)

Table 3: Unicast Routing Verified Scalability Limits (Unidimensional)

Note

• The IPv4/IPv6 host routes and the IPv4 multicast routes share the same hardware table. Limits are provided for both the default line card mode and the max host line card mode.
• You can configure up to 2034 Layer 2 VNIs with 32 static ingress replication peers on the following Cisco Nexus 3000 Series platforms:
  • C3132Q-V
  • C31108TC-V
  • C31108PC-V

Table 4: VXLAN Flood and Learn Verified Scalability Limits

Table 5: VXLAN BGP eVPN Multicast Replication with Routing Verified Scalability Limits

Table 6: VXLAN BGP eVPN BGP Ingress Replication with Routing Verified Scalability Limits

Verified Topology Limits

The tables in this section list the verified scaling capabilities with all listed features enabled at the same time. The scale numbers listed here exceed those used by most customers in their topologies. These numbers are not the maximum verified values if each feature is viewed in isolation.

Note

• The scale numbers in the Verified Topology Limits tables are for the Non-ALPM mode and the default IPv6 LPM carve value is 256 for all the platforms.
• For the verified topology scale numbers for 3132Q platform, refer to the scale numbers for 3132Q-X platform since they are identical for both these platforms.
• All the scale numbers are with Unicast RPF disabled.

Table 7: Verified Topology Limits

Table 8: Verified Topology Limits

Table 9: Verified Topology Limits

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FAQ

What should I do if my scale requirements exceed the verified limits?
If your scale requirements exceed the Verified Topology or the Verified Maximum limit, please contact your Cisco representative. They may be able to validate support for your requirements based on hardware capabilities.

How are verified limits determined?
Verified limits are established through testing and validation by Cisco specifically for supported platforms. These limits are subject to change with further testing.

Documents / Resources

CISCO NX-OS Software [pdf] User Guide NX-OS Software, Software

References

• User Manual