Thanks Erik
--- On Wed, 30/12/09, [email protected] <[email protected]>
wrote:
From: [email protected] <[email protected]>
Subject: RE: [OSL | CCIE_RS] QOS question
To: [email protected], [email protected]
Received: Wednesday, 30 December, 2009, 5:34 PM
Romarao,
No problem.
Just to clarify, you would need to mark your packets EXACTLY as your SP
expects to see them. If the PE router doesn't recognize a marking, the
packet will be placed into its class-default queue. This process will
be repeated at each router within their cloud (Per Hop Behavior).
HTH
-Erik
-----Original Message-----
From: ramarao vadlamudi [mailto:[email protected]]
Sent: Wednesday, December 30, 2009 3:10 PM
To: [email protected]; Fairbanks, Erik J. CTR USN NCSTFE-N3
Subject: RE: [OSL | CCIE_RS] QOS question
Thanks Erik,
The info you provided is usefull.Sorry I wasn't clear
on my question. I wanted to ask more on the marking of the packets as
they leave the CE router to the PE.
So the best practice would be to mark customer packets similar to
service provider's marking and classification of packets in their
network to ensure QOS works end to end(head end site to the remote
site).
Thanks
Ramu
--- On Wed, 30/12/09, [email protected]
<[email protected]> wrote:
From: [email protected] <[email protected]>
Subject: RE: [OSL | CCIE_RS] QOS question
To: [email protected], [email protected]
Received: Wednesday, 30 December, 2009, 4:44 PM
Ramarao,
Q1-
If you specified "max-reserved-bandwidth 100" and you allocated
100% of
the bandwidth to other classes, the class-default (unclassified
traffic)
would be starved and zero bandwidth would be allocated to it
during
periods of congestion. When bandwidth is freed up, this
residual
bandwidth will be assigned to the class-default queue and its
traffic
will be transmitted.
Q2-
Class-maps are locally significant to the router. They have no
bearing
on how your Service Provider treats your traffic. They are used
to
identify (classify) traffic locally to be used by a policy map
for
treatment (queueing, marking, etc). What IS passed to your
service
provider are either your TOS or DSCP markings. The Service
Provider
will look for these markings upon ingress with their own locally
significant Class-Maps for treatment within their cloud -
hop-by-hop.
What you need to do is find out what QoS services they offer and
what
you need to mark your traffic to so it will be treated properly
within
their cloud. For instance, Verizon Business in the US offers
only three
classes of services within their vBNS+ cloud - Gold, Silver, and
Bronze.
Each of these "classes" of service correspond to a DSCP/ToS
marking. To
take advantage of these classes of service, I need to mark my
traffic
appropriately as it leaves my CE router towards their PE.
I hope this helps you out. Let me know if I misunderstood your
questions.
-Erik
-----Original Message-----
From: [email protected]
<http://au.mc324.mail.yahoo.com/mc/compose?to=ccie_rs-boun...@onlinestud
ylist.com>
[mailto:[email protected]
<http://au.mc324.mail.yahoo.com/mc/compose?to=ccie_rs-boun...@onlinestud
ylist.com> ] On Behalf Of ramarao
vadlamudi
Sent: Wednesday, December 30, 2009 1:35 PM
To: [email protected]
<http://au.mc324.mail.yahoo.com/mc/[email protected]
m>
Subject: [OSL | CCIE_RS] QOS question
All,
Q1-
Can you please explain the default behaviour if you reserve 100%
on the
interface bandwidth without using the "max-reserved bandwidth
100"
command? By default 25% of the bandwidth is allocated to the
default
class. So how would my default class get served if I have no
bandwidth
reserved for it.
Q2-
Also should you use the same class maps as your SP; when you use
Layer 3
SP VPN for WAN carriage? For instance if I have 8 class maps and
SP had
only 6 class maps, how would my traffic be treated in their SP
network.
If 6 of my class-map maps to what SP has in their network and 2
of my
class-maps do not map to any thing in their network, will they
treat my
class-maps which don't map to any of their class maps to their
default
CM.
Thanks
Ramu
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