From: Debbie Westall (dwestall@debbie.coxfiber.net)
Date: Mon Nov 10 2003 - 22:55:03 GMT-3
I am working on designing some QoS for our new Gig backbone we have just
installed. I need some assistance with the setup.
We are cutting over our high speed internet data portion now and will be
cutting over VOD (video on demand) early next month.
In addition, sometime next year we will be rolling out VoIP. We would like to
implement some kind of QoS for ospf also, we want to ensure that adjacencies
never drop due to congestion. During our testing of the 2-gig pipes we saw
the ospf adjacencies dropping while staturating the links. Although we dont
anticipate this to happen during "normal" operation, the Management wanted
some kind protection against this.
Our backbone consists of 5-7609 OSRs. They are connected via port-channel
(2-gigs) to each other. We also have 8 other sites connected via Gig that have
dual vlans back to the main site. So all traffic must flow through our main
RDC (Regional Data Center).
Also I was wondering since these are 7609 switches, do I need to set the
interface to "trust" cos/dscp, prior to implementing the QoS?
Here is a rough picture of the network
---- port channels ----
| | ------------------ | | MAIN SITE
---- ----
| |
| |
---- ----
| | | |
---- ----
| |
| ---- |
----------| |----------
---- connecting 7609s are port channels
at each site.
From the 2 main sites at the top of this there are 8 other sites, each
with 7609s in place, with VLANs back to each RDC 7609.
Here is what I was thinking of implementing....
class-map video
match xxxx (I'm still working to determine if the application signals the
COS, if not, I will have to set, probaly use 4)
!
class-map ospf
match ip access-group 130
!
policy-map ingress
class video
set ip precedence 4
!
class ospf
set ip precedence 3
!
access-list 130 permit ospf any any
!
int fa9/30
service-policy input ingress
!
!
policy-map egress
class ospf
band 1000
random-detect
!
class video
band 2000
random-detect
!
int po2
service-policy output egress
!
When we roll the VoIP, I would use LLQ to prioritize the voice traffic.
Please let me know what you think, or if you have better solutions.
Thanks in advance for your assistance.
Debbie
This archive was generated by hypermail 2.1.4 : Fri Dec 12 2003 - 12:29:10 GMT-3