This tab lets you view and configure the parameters for a rate limit. Rate limits are components of a Policy Manager class of service, and are used to control the transmit rate at which traffic enters and exits ports in your network.
Policy Manager uses Role-Based rate limits that are tied directly to roles and rules, and are written to a device when the role/rule is enforced. Policy Manager also supports Priority-Based rate limits for use with legacy devices. (Refer to the NetSight Firmware Support tables to determine which type of rate limit a specific device/firmware supports.) Use the two sub-tabs to configure role-based and (if applicable) priority-based parameters for the rate limit.
To access this tab, open the Class of Service Configuration window (available from the Policy Manager Edit menu). Then, select the "Show all CoS Components in Tree (Advanced Mode)" option from the Domain Managed CoS Components menu to display the CoS tree in the left panel. Select a rate limit in the tree, and the General tab will display in the right panel.
If you make a change on this tab, you need to enforce in order for it to take effect.
Click the graphic for more information.
- Description
- Use the Edit button to open a window where you can enter or modify a description of the selected rate limit.
- Rate Limit
- Specify the highest transmission rate at which traffic can
enter or exit a port before packets will be
rate limited:
- % - A percentage of the total bandwidth available (not available for priority-based rate limits)
- PPS - Packets per second (not available for priority-based rate limits)
- Kb/s - Kilobits per second
- Mb/s - Megabits per second
- Gb/s - Gigabits per second
Role-Based Configuration Tab
Use this subtab to configure the actions for a role-based rate limit and view a list of ports where the rate limit has been exceeded.
Click the graphic for more information.
- Actions
- Select the action type(s) you would like this rate limit to use:
- Generate System Log on Rate Violation - a syslog message is generated when the rate limit is first exceeded.
- Generate Audit Trap on Rate Violation - an audit trap is generated when the rate limit is first exceeded.
- Disable Port on Rate Violation - the port is disabled when the rate limit is first exceeded.
NOTE: N-Series Gold devices do not support rate limit notification.
- Port Violations Table
- This table lists the ports where the rate limit has been exceeded. It displays the name of the port, constructed of the name or IP address of the device and either the port index number or the port interface name.
- Clear Button
- Clears the violations table. If port traffic continues to exceed the rate limit, ports will reappear in the table. Any ports disabled due to the rate violation will be re-enabled.
- Port Properties Button
- Select a port in the table and click this button to access the port's General tab where you can view and edit port information.
Priority-Based Configuration Tab
Use this tab to configure parameters for a priority-based rate limit. Priority-based rate limits are used primarily by legacy devices.
Click the graphic for more information.
- Direction
- Select Inbound or Outbound, depending on whether the rate limit is for inbound or outbound traffic. In order to control traffic inbound and outbound on the same port, two rate limits must be configured (one inbound and one outbound). Inbound rate limiting takes place after a frame has been classified into one of the eight priorities. Outbound rate limiting takes place just before a frame is queued for transmission.
- Precedence
- The order in which priority-based rate limits will be written to devices that support them. Click Edit to open the Precedence tab, where you can change the order in which rate limits will be applied.
- 802.1p Priorities
- Select the 802.1p priority or priorities with which the rate limit will be associated. Each 802.1p priority can have only one inbound and one outbound rate limit; therefore, if a priority is already being utilized for the selected direction, it is grayed out.
- C2/B2 10/100 Priority
- C2/B2 10/100 ports support two rate limits (inbound only). If you are creating a rate limit to be used on C2/B2 10/100 ports, select either Low to associate the rate limit with priorities 0-3 or High to associate the rate limit with priorities 4-7. You can select both Low and High if you want to associate the rate limit with priorities 0-7. If the Low or High priority is already being utilized for another rate limit, it will be grayed out. Because C2/B2 10/100 ports only support inbound rate limits, this section will be grayed out if you have selected Outbound for your rate limit Direction. C2/B2 Gigabit ports support eight rate limits (inbound only); for those ports, select the 802.1p priorities as you would for other ports.
- Exclusion
- Specify the network elements to which this rate limit will not apply. For example, rate limiting is most often used for edge devices; therefore, you might want to exclude a device group or port group containing non-edge devices or ports. Click Edit to open the Add/Remove Network Elements window where you can select network elements to exclude from the rate limit. To remove a network element from the exclusion list, select it and click Remove.
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