Verified Scalability Limits
This document describes the Cisco NX-OS configuration limits for the Cisco Nexus 3232C and 3264Q switches.
Introduction
The values provided in this guide should not be interpreted as theoretical system limits for Cisco Nexus 3232C or 3264Q 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 unidimensional verified scalability limits for Cisco NX-OS Release 7.0(3)I5(2) on the Cisco Nexus 3232C and 3264Q switches. 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.
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
DHCP clients per switch |
10 (IPv4) + 10 (IPv6) |
10 (IPv4) + 10 (IPv6) |
BFD sessions |
256 |
256 |
Port channel links |
32 |
32 |
SVIs |
400 |
400 |
vPCs |
100 |
60 |
Static network address translation (NAT) |
1023 |
1023 |
Dynamic network address translation (NAT) |
1023 |
1023 |
Static twice network address translation (NAT) |
768 |
768 |
Dynamic twice network address translation (NAT) |
1023 |
1023 |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
Forwarding Equivalence Classes (FECs) |
128 |
128 |
Equal-cost multipaths (ECMPs) |
16 |
16 |
FECs * ECMPs |
1000 |
1000 |
Flex counters for static MPLS in egress direction |
4000 |
4000 |
Flex counters per adjacency |
2 |
2 |
Adjacencies |
1024 |
1024 |
Egress Per Engineering |
64 |
64 |
Label-switched paths (LSPs) for label stack imposition1 |
128 (with 4-way ECMP and 3 label stack push) |
128 (with 4-way ECMP and 3 label stack push) |
Note |
The maximum number of FECs and ECMPs cannot be configured at the same time. For example, if you have 128 FECs and all of those FECs have 8 ECMPs, you will have 128 * 8 = 1024 adjacencies, so egress statistics will be supported for all. In contrast, if you have 100 FECs and all of those FECs have 16 ECMPs, you will have 100 * 16 = 1600 adjacencies. Because a maximum of 1024 adjacencies are supported, the statistics might not work as expected. |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
MST instances |
64 |
64 |
MST virtual ports |
48,000 |
48,000 |
RPVST virtual ports |
12,000 |
12,000 |
VLANs |
3900 |
3900 |
VLANs in RPVST mode |
500 |
500 |
Total number of VLANs × ports with switchport isolated (3967 VLANs x 48 ports) |
190,000 |
190,000 |
Note |
The number of supported VLANs per vPC should be within the MST or RPVST virtual port count specified in this table, depending on the topology. |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
IPv4 multicast routes |
8000 (Layer 2 + Layer 3) |
8000 (Layer 2 + Layer 3) |
Outgoing interfaces (OIFs) |
40 (SVI + physical Layer 3) |
40 (SVI + physical Layer 3) |
IGMP snooping groups |
8000 |
8000 |
PIM neighbors |
250 |
250 |
Note |
These multicast scalability numbers are for Layer 2 and Layer 3. |
Note |
Graceful restart is not supported when unicast or multicast aggressive timers are configured at any scale. |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
OpenFlow |
||
OpenFlow Layer 3 flows |
760 |
760 |
OpenFlow Lite Layer 3 flows |
2001 |
2001 |
OpenFlow IPv6 Layer 3 flows |
1500 |
1500 |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
DHCP snooping bindings |
2048 |
2048 |
IPv4 ingress ACLs (lite TCAM region) |
2304 (per network forwarding engine) |
2304 (per network forwarding engine) |
IPv4 ingress ACLs (non-lite TCAM region) |
768 (per network forwarding engine) |
768 (per network forwarding engine) |
IPv4 egress ACLs (non-lite TCAM region) |
768 (per network forwarding engine) |
768 (per network forwarding engine) |
IPv6 ingress ACLs (non-lite TCAM region) |
768 (per network forwarding engine) |
768 (per network forwarding engine) |
IPv6 egress ACLs (non-lite TCAM region) |
256 (per network forwarding engine) |
256 (per network forwarding engine) |
Note |
These ACL scalability numbers were verified with all TCAM regions freed up except the CoPP system and ingress system TCAM regions. |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
PTP |
||
10G physical ports enabled for PTP |
44 |
44 |
sFlow |
||
sFlow ports |
64 |
64 |
SPAN and ERSPAN |
||
Configurable SPAN and ERSPAN sessions |
32 |
32 |
4 |
4 |
|
Active localized SPAN or ERSPAN sessions4 |
4 |
4 |
Source interfaces per SPAN or ERSPAN session (Rx and Tx, Rx, or Tx) |
48 |
48 |
Destination interfaces per SPAN session |
1 (physical interface) |
1 (physical interface) |
Source VLANs per SPAN or ERSPAN session |
32 |
32 |
Feature |
3232C Verified Limit |
3264Q Verified Limit |
---|---|---|
Unicast Routing |
||
BGP neighbors |
512 (IPv4 only) 512 (IPv6 only) 256 (IPv4) + 256 (IPv6) |
512 (IPv4 only) 512 (IPv6 only) 256 (IPv4) + 256 (IPv6) |
EIGRP neighbors |
256 (IPv4) 256 (IPv6) 128 (IPv4) + 128 (IPv6) |
256 (IPv4) 256 (IPv6) 128 (IPv4) + 128 (IPv6) |
EIGRP routes |
20,000 |
20,000 |
HSRP groups |
400 |
400 |
IPv4 ARP |
Default system routing mode: 32,000 ALPM routing mode: 8000 |
Default system routing mode: 32,000 ALPM routing mode: 8000 |
IPv4 host routes |
Default system routing mode: 104,000 (hash table and there will be more collisions after 80%) ALPM routing mode: 128,000 (the host routes programmed in the ALPM table) |
Default system routing mode: 104,000 (hash table and there will be more collisions after 80%) ALPM routing mode: 128,000 (the host routes programmed in the ALPM table) |
IPv6 host routes |
Default system routing mode: 52,000 ALPM routing mode: 15,000 (the host routes programmed in the ALPM table and with TCAM ALPM carving) |
Default system routing mode: 52,000 ALPM routing mode: 15,000 (the host routes programmed in the ALPM table and with TCAM ALPM carving) |
IPv6 ND |
Default system routing mode: 32,000 ALPM routing mode: 4000 |
Default system routing mode: 32,000 ALPM routing mode: 4000 |
IPv4 unicast routes (LPM) |
Default system routing mode: 12,000 ALPM routing mode: 128,000 |
Default system routing mode: 12,000 ALPM routing mode: 128,000 |
IPv6 unicast routes (LPM) |
Default system routing mode: 6000 (<=64) + 1000 (65-127) ALPM routing mode: 10,000 (15,000 with TCAM ALPM carving) |
Default system routing mode: 6000 (<=64) + 1000 (65-127) ALPM routing mode: 10,000 (15,000 with TCAM ALPM carving) |
MAC addresses |
30,000 |
30,000 |
OSPFv2 neighbors |
256 |
256 |
OSPFv3 neighbors |
256 |
256 |
VRFs |
2000 |
2000 |
VRRP groups |
250 |
250 |
Note |
Graceful restart is not supported when unicast or multicast aggressive timers are configured at any scale. |
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 and OSPFv3 scale value might vary when combined with other parameters.
- The graceful restart timeout value might need to be increased in multidimensional scenarios.