[alcatel-nsp] Question about Service QoS Policies on 7750SR
Mark.Griffin at hawaiiantel.com
Fri Feb 13 17:30:42 EST 2009
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
description "QoS test"
scheduler-policy "10mb-SHAPING" create
scheduler "root-parent" create
rate 10000 cir 2000
sap 1/2/2:100 create
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
queue 4 create
port-parent level 6 cir-level 6
rate 500 cir 500
fc h1 create
fc l2 create
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
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!
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