QoS Overview
Page 64 7210 SAS D, E, K OS Quality of Service Guide
• CBS buffer pool
• Ingress non-ring MBS pool
• Egress non-ring MBS pool
• Ingress ring MBS pool
• Egress ring MBS pool
CBS buffer pool is used to allocate buffers towards committed burst size (CBS) configured per
queue for all the SAPs and access-uplink port queues and some internal system queues.
MBS pool is divided into four pools as shown above. The Ingress and Egress non-ring MBS buffer
pool and the Ingress and Egress ring MBS buffer pool. These MBS buffer pools can be over-
subscribed. The Ingress and Egress ‘non-ring’ MBS buffer pool is used to allocate buffers towards
the Maximum Burst Size (MBS) configured per queue for all the access SAP ingress and access
SAP egress queues. The Ingress and Egress ‘ring’ MBS buffer pool is used to allocate buffers
towards Maximum Burst Size (MBS) configured per queue for all the access-uplink port ingress
and access-uplink port egress queues.
The amount of memory allocated towards these pools is software defined and not user
configurable. The following sample of the show system pools command displays the buffer
allocated towards the various pools:
A:dut-i# show pools 1/1/1 system
===============================================================================
Pool Information
===============================================================================
Port : 1/1/1
Application : System
MMU Total : 65536 KB
MMU CBS : 14336 KB MMU CBS In Use : 2240 KB
Ingress Ring : 11776 KB Ingress Ring In Use: 0 KB
Ingress NonRing : 11776 KB Ingress NonRing In*: 0 KB
Egress Ring : 11776 KB Egress Ring In Use : 0 KB
Egress NonRing : 11776 KB Egress NonRing In *: 0 KB
---------------------------- snipped ----------------------------
Ring and Non-Ring Buffer pool on 7210 SAS-K
When 7210 SAS-K is deployed in a ring environment, the access-uplink ports are typically used to
connect the node to ring. Therefore, they are designated as the ring ports. These ring ports carry
traffic from the head-end towards 7210 SAS-K, dropping traffic off to user locations.
Simultaneously, these ring ports carry traffic from the user to the head-end. In other words, traffic
received from the user is added to the ring and sent out towards the service edge, where services
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