To configure a 7210 and 1830 slope policy

Purpose

A 7210 and 1830 slope policy defines the values used for calculating drop precedence for egress queues in port buffer pools. Values are configured as drop rate percentages for each queue or as parameters for WRED slope calculations.

Note: The allocation of device memory for buffer pools and queues varies, depending on the chassis type. The slope calculation algorithm also varies by chassis type. See the NE documentation for more information.

The policy allows the configuration of the following slopes for a queue:

  • High Slope (high priority TCP slope for in-profile packets)

  • Low Slope (low priority TCP slope for out-of-profile packets)

  • Non-TCP Slope

You can configure some 7210 SAS chassis types to use only TCP slopes (two slopes per queue). See To configure two WRED slopes on a 7210 SAS .

You can also configure a High Ring Slope and a Low Ring Slope.

7210 and 1830 slope policies are identified by the policy name and description; policy ID numbers are not used.

The policy is assigned to egress buffer pools during port configuration; see To configure Ethernet ports . The policy can also be assigned to queues in the following policies:

A default slope policy is applied if no policy is explicitly assigned.

The policy is supported on the 7210 SAS-D, 7210 SAS-Dxp, 7210 SAS-E, 7210 SAS-K, 7210 SAS-M, 7210 SAS-S, 7210 SAS-Sx, and 7210 SAS-T. Support for specific parameters and features varies, depending on the chassis type. Local definitions of the policy do not necessarily support all configurations in the global policy. See the NE documentation for more information.

The 7210 SAS-R and 7210 SAS-X do not support 7210 and 1830 slope policies; these devices use queue management policies instead. See To configure a 7210 and 7250 Queue Management policy .

Steps
 
1 

Choose Policies→QoS→SROS QoS→Slope→7210 and 1830 Slope from the NFM-P main menu. The 7210 and 1830 Slope Policies form opens.

2 

Click Create or choose a policy and click Properties. The WRED Slope Policy (Create|Edit) form opens.

3 

Configure the required parameters on the General tab.

4 

Configure drop rates for queues. Click on the Burst Size tab and configure the parameters in the Low Slope and High Slope panels.

5 

Configure slope calculation values for queues.

  1. Click on the Queue Slope tab. Eight default queues are displayed.

  2. Choose a queue and click Properties. The Queue Slope, WRED Slope Policy form opens.

  3. Configure the required parameters.

  4. Save your changes and close the form.

6 

Click on the Slope tab and configure the required parameters.

7 

Click OK to save the policy and close the form, or click Apply to save the policy. See To release and distribute a policy to distribute the policy to NEs.

End of steps