Buffer pool policies

General Information

There are two types of buffer pool policies:

• HSMDA policies: The high scale Ethernet MDA (HSMDA) pool policy can be assigned to an ingress or egress HSMDA to control how buffers are distributed between HSMDA queues. HSMDA pool policies do not apply to ports.

  Note: HSMDA is only supported on 7750 SR-7/12/12e and 7450 ESS-7/12, Release 20.10 and earlier. The NFM-P does not support HSMDA pool policies on other NEs.

• Named buffer pool policies: Named buffer pool policies allows you to create named pools to override the default buffer pool behavior by creating and allocating ingress and egress queues. Named pools are configured in the named buffer pool policy and are applied at the MDA and/or port ingress and egress level.

  Named pools can be further defined in Q1 pools configuration. You can configure and assign queue pools to the following policies:

  • SAP Access Ingress

  • SAP Access Egress

  • Network Queue

  • Shared Queue

  When a policy is associated at the MDA level, named pools defined in the policy allow queues from any port to be associated. When a policy is associated at the port level, named pools are only available to queues associated with that port. A named pool policy that is currently applied to a MDA or port can be deleted after all association between the policy and the MDA or port have been removed.

  When buffer pools are created, renamed or deleted, queues mapped to the pools are moved to default pools. When a queue is moved, traffic that was destined for the queue is temporarily moved to a fail over queue. After the old queue is drained, and the new queue is created and associated with the buffer pool, the saved statistics are loaded to the new queue and traffic is moved from the fail over queue to the new queue.

  Workflow to configure a named buffer pool describes the high-level steps to configure Named Buffer Pools and Q1 pools.