The Policy tab class of service feature provides the ability to create rate limit port groups that let you group together ports with similar rate limiting requirements. For instructions on creating a port group, see Creating Class of Service Port Groups.
This Help topic provides information about an advanced port group feature that lets you specify different rate limits for the different port types contained in a port group: 8-rate limit, 32-rate limit, 64-rate limit, and 100-rate limit port types.
After you have created your port groups, you can use the CoS to rate limit mappings tab to configure rate limit index mappings for each group. These mappings map a logical rate limit index to an actual physical rate limit created in the Policy tab. For each class of service, you can select one mapping index that gives you the desired physical rate limit for each port group (see the Index Numbers section of the CoS General tab for more information on CoS Index Numbers).
The Policy tab supports a maximum of 100 logical rate limit indexes and each rate limit port group lets you map all 100 indexes. For 8-rate limit, 32-rate limit, and 64-rate limit ports, this means that the number of logical indexes might be greater than the actual number of rate limits the port supports. The port group can map 100 logical rate limit indexes, but they can only be mapped to a maximum of 8, 32, or 64 different physical rate limits on those ports.
For example, you want to have 25 rate limits for 25 different CoS. You need to define the behavior for the 8-rate port type, since when you get to the 9th rate, you would have no more resources available for the remaining rates (9-25). You would either need to share some of the same resources, or not rate limit with the remaining rates.
The maximum supported indexes for a device is based on the largest number of rates supported for that device. On devices supporting a maximum of 8 rate limits, indexes 0-7 are supported. On devices supporting a maximum of 32 rate limits, indexes 0-31 are supported. On devices supporting 64 rate limits, IRL indexes 0-63 are supported. If a rate limit port group maps indexes greater than the supported value, they are ignored during Enforce (indicated in the Class of Service > Rate Limit Mappings tables of Enforce Preview)
Instructions on:
Configuring Rate Limit Mappings
Use the following instructions configure rate limit mappings for a port group.
- Open the Class of Service > CoS Components left-panel tab.
- Select either the Inbound Rate Limit Port Groups or Outbound Rate Limit Port Groups left-panel tab.
- Select the right-panel CoS - Rate Limit Mappings tab.
- Select Add/Edit to open the Add/Edit CoS to Rate Limit Mappings window.
- In the window, specify the IRL (Inbound Rate Limit) or ORL (Outbound Rate Limit) Index you are mapping.
- Use the drop-down list to select a rate limit to map to the index.
- The port type options enable you to create a mapping for all port types at one time, or create a mapping just for specific port types.
- Select the OK button to map all your indexes and close the window. The Mappings tab displays your index to rate limit mapping configuration.
Associating Rate Limits with a Class of Service
After you have configured the rate limit mappings for a port group, you can associate a rate limit mapping index with a class of service.
- Open the Class of Service left-panel tab.
- Select the CoS in the left-panel tree. (If you have not created the class of service, see How to Create a Class of Service.)
- At the bottom of the Class of Service tab in the right panel, select the Edit button next to the IRL or ORL index that you want to configure. The Edit Index window opens.
- This window lists all the currently mapped rate limits, organized by index number for each existing port type and group. Selecting one index number automatically includes all the rate limits configured for that index number. To configure new mappings for the CoS, you can first select an index that is not currently mapped, then create the mappings as described in Configuring Rate Limit Mappings above. Select OK.
- After you have selected the mapping index, the table below displays the actual rate limits used by each rate limit port group for that class of service.
- Select Open/Manage Domains > Save Domain.
For information on related help topics: