Configuring Port-based Control Plane Traffic Protection
Certain switch models make use of an internal rear-facing interface for CPU communication in addition to a special control-port. Other models use the control-port only.
For all these cases, by default 8 queues are available for control plane traffic segregation and rate-limiting on a per internal port basis. The corresponding eight default packet rates (pps) can be displayed with the following command:
CLI (network-admin@switch) > port-cos-rate-setting-show layout-vertical
switch: switch
port: control-port
ports: 0
cos0-rate(pps): 5000
cos1-rate(pps): 5000
cos2-rate(pps): 5000
cos3-rate(pps): 5000
cos4-rate(pps): 5000
cos5-rate(pps): 5000
cos6-rate(pps): 5000
cos7-rate(pps): 5000
Internal (rear facing) data and span ports can be present in a system to carry control plane traffic to the CPU, each using 8 separate queues and rates, as shown below in condensed form:
CLI (network-admin@switch) > port-cos-rate-setting-show
port ports cos0-rate(pps) cos1-rate(pps) cos2-rate(pps) ... cos6-rate(pps) cos7-rate(pps)
------------ ----- -------------- -------------- -------------- ... -------------- --------------
control-port 0 100000 100000 100000 ... 100000 100000
data-port 117 100000 100000 100000 ... 100000 100000
span-ports 118 100000 100000 100000 ... 100000 100000
It is possible to modify the default rate settings in packets per second using the port-cos-rate-setting-modify command:
CLI (network-admin@switch) > port-cos-rate-setting-modify ?
|
port-cos-rate-settings-modify |
Update the port cos rate limit |
|
port control-port|data-port|span-ports |
port |
|
Specify at least one of the following options |
|
|
cos0-rate unlimited|0..10000000 |
cos0 rate limit (pps) |
|
cos1-rate unlimited|0..10000000 |
cos1 rate limit (pps) |
|
cos2-rate unlimited|0..10000000 |
cos2 rate limit (pps) |
|
cos3-rate unlimited|0..10000000 |
cos3 rate limit (pps) |
|
cos4-rate unlimited|0..10000000 |
cos4 rate limit (pps) |
|
cos5-rate unlimited|0..10000000 |
cos5 rate limit (pps) |
|
cos6-rate unlimited|0..10000000 |
cos6 rate limit (pps) |
|
cos7-rate unlimited|0..10000000 |
cos7 rate limit (pps) |
For example, the Class 0 rate for control traffic can be configured using the following command:
CLI (network-admin@switch) > port-cos-rate-setting-modify port control-port cos0-rate <rate>
In addition, to show the per-queue traffic statistics you can issue the following command:
CLI (network-admin@switch) > port-cos-stats-show port 0 layout vertical
switch: switch
time: 11:59:15
port: 0
cos0-out: 58.8M
cos0-drops: 180M
cos1-out: 58.8M
cos1-drops: 185M
cos2-out: 0
cos2-drops: 0
cos3-out: 0
cos3-drops: 0
cos4-out: 0
cos4-drops: 0
cos5-out: 0
cos5-drops: 0
cos6-out: 65.5M
cos6-drops: 1.06G
cos7-out: 483K
cos7-drops: 493M
To clear the queue statistics on the internal ports, use the port-cos-stats-clear command.