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This chapter contains the following sections:
You can configure span-egress hardware rate-limit to restrict amount of ERSPAN monitor traffic transmitted out of the Cisco NX-OS device. You can configure rate limits in packets per second for the following types of traffic:
SPAN egress traffic—For this option, you can configure rate limits in kilobits per seconds.
The following table shows the licensing requirements for this feature:
|
Product |
License Requirement |
|---|---|
|
Cisco NX-OS |
No license is required for rate limits. Any feature not included in a license package is bundled with the nx-os image and is provided at no extra charge to you. For an explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide. |
Rate limits has the following configuration guidelines and limitations:
Cisco Nexus 3500 Series switches do not support configuring Rate Limits on Cisco NX-OS Release 7.0(3)I7(2) and the previous releases.
Beginning with Cisco NX-OS Release 7.0(3)I6(1), you can configure a hardware rate-limiter to show statistics for outbound ERSPAN monitor traffic on egress ports.
The rate-limiter on egress ports is limited per ASIC, rather than per port or SPAN session.
The rate-limiter only applies to ERSPAN and not local SPAN traffic.
sFlow and ERSPAN cannot co-exist in the same Cisco Nexus NFE2-enabled devices.
 Note |
If you are familiar with the Cisco IOS CLI, be aware that the Cisco NX-OS commands for this feature might differ from the Cisco IOS commands that you would use. |
This table lists the default settings for rate limits parameter.
|
Parameters |
Default |
|---|---|
|
SPAN egress rate limit |
No limits |
You can set rate limits on supervisor-bound traffic.
| Command or Action | Purpose | |||
|---|---|---|---|---|
| Step 1 |
configure terminal Example: |
Enters global configuration mode. |
||
| Step 2 |
hardware rate-limiter span-egress rate Example: |
Configures rate limits in kilobits per second for SPAN for egress traffic. The range is from 0 to 100000000.
|
||
| Step 3 |
(Optional) show hardware rate-limiter span-egress Example: |
(Optional)
Displays the rate limit configuration. |
||
| Step 4 |
(Optional) copy running-config startup-config Example: |
(Optional)
Copies the running configuration to the startup configuration. |
You can monitor rate limits.
| Command or Action | Purpose |
|---|---|
|
show hardware rate-limiter span-egress Example: |
Displays the rate limit statistics. |
You can clear the rate limit statistics.
| Command or Action | Purpose |
|---|---|
|
clear hardware rate-limiter span-egress Example: |
Clears the rate limit statistics. |
To display the rate limit configuration information, perform the following tasks:
|
Command |
Purpose |
|---|---|
|
show hardware rate-limiter | span-egress |
Displays the rate limit configuration. |
The following shows an example of the rate-limiter configuration for ERSPAN:
switch(config)# hardware rate-limiter span-egress 100
Warning: This span-egress rate-limiter might affect functionality of sFlow
switch(config)# show hardware rate-limiter span-egress
Units for Config: packets per second (kilo bits per second for span-egress)
Allowed, Dropped & Total: aggregated since Module: 1
R-L Class Config Allowed Dropped Total
+----------------+----------+--------------+--------------+----------------+
span-egress 123 0 0 0
<<configured
This section includes additional information related to implementing rate limits.
|
Related Topic |
Document Title |
|---|---|
|
Cisco NX-OS licensing |
Cisco NX-OS Licensing Guide |
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