[alcatel-nsp] Question about Service QoS Policies on 7750SR

[Mark Griffin]

Hi Kila,

 

There are two approaches I know of to make SAPs on a common port share a
bandwidth pool.  The most common one is to use a multi-service site
policy.  It allows you to tie all the common SAPs to a scheduler.  It's
used in the Triple Play model and it can be used for business services
to allow two services to share a common virtual pipe.  The disadvantage
is it is provisioned under the customer construct so it might not be
ideal for a business model that uses separate customer entities.  Below
is an example of using it in a business service model to create a 10mb
virtual pipe that has one SAP to a VPLS service and another SAP used to
terminate to an internet service.

 

customer 2500 create

            multi-service-site "VPLS+Internet" create

                assignment port 1/2/2

                ingress

                    scheduler-policy "10mb-SHAPING"

                exit

                egress

                    scheduler-policy "10mb-SHAPING"

                exit

            exit

            description "QoS test"

        exit

 

 scheduler-policy "10mb-SHAPING" create

            description "10mb-BUSINESS-CLASS-SCHEDULER"

            tier 1

                scheduler "root-parent" create

                    rate 10000 cir 2000

                exit

            exit

        exit

 

sap 1/2/2:100 create

                multi-service-site "VPLS+Internet"

                ingress

                    qos 2500

                exit

                egress

                    qos 2500

                exit

            exit

 

 

The other thing you can do is use a port scheduler.  From my
understanding this allows SAPs to share a parent that has its own levels
and rates.   Down side to this one is it is only on egress and I don't
think you can use it in tandem with a hierarchal scheduler.

 

port-scheduler-policy "port-test" create

            level 1 rate max cir 20000

            level 6 rate 10000 cir 10000

 

 

 sap-egress 2003 create            

            queue 1 create

                port-parent cir-level 1

                rate 11000 cir 1000

            exit

            queue 4 create

                port-parent level 6 cir-level 6

                rate 500 cir 500

            exit

            fc h1 create

                queue 4

                dot1p 5

            exit 

            fc l2 create

                queue 1

                dot1p 0

            exit

 

________________________________

From: alcatel-nsp-bounces at puck.nether.net
[mailto:alcatel-nsp-bounces at puck.nether.net] On Behalf Of Kila Hsu
Sent: Friday, February 13, 2009 8:45 AM
To: alcatel-nsp at puck.nether.net
Subject: [alcatel-nsp] Question about Service QoS Policies on 7750SR

 

Hi everyone,

I have a question regarding Service QoS Policies on 7750SR. 
>From the configuration guide, the ingress/egress policies are applied on
SAP, which looks like each SAP will have its own queues/schedulers.
However it is not clear to me how packets from different SAP will be
scheduled when they are defined on the same port. 
Moreover, similar situation could happen if we have multiple tier 1
schedulers defined in a scheduler policy. 
So is there an implicit single FIFO that handles these, or are there
still some kinds of QoS applied (and how?)

Thanks a lot!

Kila Hsu

 

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