11-24-2009 06:31 AM - edited 03-06-2019 08:43 AM
Polycom teleconference traffic requires 1.2 MB (bandwidth). Site A has 2 x 2MB serial circuits to Site B.
What is best pratice to apply QOS on both serial interfaces (ingress/egress) on both sites.
Please advise.
### Site A Router ###
access-list 104 permit tcp any any range 3230 3243
access-list 104 permit udp any any range 3230 3285
class-map match-all POLYCOM-CONF
match access-group 104
policy-map POLY-POLICY
class POLYCOM-CONF
class class-default
fair-queue
interface Serial3/0:0
description "Link to Site B"
bandwidth 2048
ip address 10.218.92.25 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
service-policy input POLY-POLICY
interface Serial3/1:0
description "Link to Site B"
bandwidth 2048
ip address 10.218.92.21 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
service-policy input POLY-POLICY
### Site B Router ###
access-list 104 permit tcp any any range 3230 3243
access-list 104 permit udp any any range 3230 3285
class-map match-all POLYCOM-CONF
match access-group 104
policy-map POLY-POLICY
class POLYCOM-CONF
priority xxxx
class class-default
fair-queue
interface Serial3/0:0
description "Link to Site A"
bandwidth 2048
ip address 10.218.92.25 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
service-policy input POLY-POLICY
interface Serial3/1:0
description "Link to Site A"
bandwidth 2048
ip address 10.218.92.21 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
service-policy input POLY-POLICY
Solved! Go to Solution.
11-24-2009 08:00 AM
Hello Colm,
>> If I apply 1200kbps (PQ) for teleconference traffic on both serial interfaces, does this allow all traffic 'default' to use the full 2mb on both serial interfaces when teleconference is not being used?
yes, this is the elasticity of LLQ CBWFQ
Hope to help
Giuseppe
11-24-2009 07:34 AM
Hello Colm,
nice to hear from your you
you are using load sharing per packet so each flow will see its packets sent in round robin over the two serial links.
you need also to provide enough resources in case one link has failed.
I would use a class-map with bandwidth 1200 kbps on both links
class-map polycom
! your match condition here a simple ACL should be enough
match access-group 111
I see you want to use priority command that is possible too in that case I would use priority 1200
in normal conditions only 600 kbps will be used on each link.
Unused resources are available to other traffic classes so this is not a problem to have priority 1200 on interface
Be also aware that if the two links have different delays and / or are going though different WAN provider(s) switches there is potential for out of order that can be a problem.
incoming policy doesn't play a key role here
Hope to help
Giuseppe
11-24-2009 07:52 AM
Hi Giuseppe,
Thanks for the below info.
If I apply 1200kbps (PQ) for teleconference traffic on both serial interfaces, does this allow all traffic 'default' to use the full 2mb on both serial interfaces when teleconference is not being used?
Giuseppe wrote...
Unused resources are available to other traffic classes so this is not a problem to have priority 1200 on interface
### Config to be applied to both Routers ####
access-list 104 permit tcp any any range 3230 3243
access-list 104 permit udp any any range 3230 3285
class-map match-all POLYCOM-CONF
match access-group 104
policy-map POLY-POLICY
class POLYCOM-CONF
priority 1200
class class-default
fair-queue
interface Serial3/0:0
bandwidth 2048
ip address 10.218.92.25 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
interface Serial3/1:0
bandwidth 2048
ip address 10.218.92.21 255.255.255.252
ip load-sharing per-packet
service-policy output POLY-POLICY
Regards,
Colm
11-24-2009 08:00 AM
Hello Colm,
>> If I apply 1200kbps (PQ) for teleconference traffic on both serial interfaces, does this allow all traffic 'default' to use the full 2mb on both serial interfaces when teleconference is not being used?
yes, this is the elasticity of LLQ CBWFQ
Hope to help
Giuseppe
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide