As you can imagine, we are having some voice issues
across the link and I need to get QoS set up between the two routers.
One of our techs has done this on an older router by
defining ports using nbar and prioritizing that way. I am not too knowledgable in Cisco routing
and definately not in QoS, so please bear with me.
We ran the QoS wizard on the 1921 and got the
following output:
Configuration commands for the router: 192.168.41.10
saved on Dec 9, 2011 2:53:44 PM
class-map match-any CCP-Transactional-1
class-map match-any CCP-Management-1
class-map match-any CCP-Routing-1
class-map match-any CCP-Signaling-1
class-map match-any CCP-Voice-1
policy-map CCP-QoS-Policy-1
class
CCP-Voice-1
set dscp ef
priority
percent 50
exit
class
CCP-Signaling-1
set dscp cs3
bandwidth
percent 5
exit
class
CCP-Routing-1
set dscp cs6
bandwidth
percent 5
exit
class
CCP-Management-1
set dscp cs2
bandwidth
percent 5
exit
class
CCP-Transactional-1
set dscp af21
bandwidth
percent 5
exit
class
class-default
fair-queue
random-detect
exit
exit
interface Serial0/0/0
ip nbar
protocol-discovery
service-policy
output CCP-QoS-Policy-1
exit
Now, I assume I need to modify this section
"class-map match-any CCP-Voice-1
" to define the ports that are used by the
Shoretel system to prioritize that traffic between the routers. I have researched and cannot find anything as
to how to tell the router to priorotize specific port traffic.
Does anyone know the correct commands or structure to
type? Or am I completely wrong in how this should be done? If so, can anyone
point me in the right direction?
The solution
In the Shoretel Director set the Diffserv value to
184 (under Call Control -> Options)
In the Cisco device.... configure EVERY port (for
director + all phones + all trunks) to
interface x/x
qos trust dscp
or
mls qos trust dscp
Create access list to map Shoretel ports
access-list 100 remark Shoretel VoIP
access-list 100 permit udp any any eq 2427
access-list 100 permit udp any any eq 2727
access-list 100 permit udp any any range 5440 5446
access-list 101 remark Shoretel Director
access-list 101 permit udp host
IP_ADDRESS_OF_DIRECTOR gt 1024 any gt 1024
Add the match statements to the Voice Priority Queue
created by wizard
class-map match-any CCP-Voice-1
match ip dscp
ef
match
access-group 100
match
access-group 101
You might consider bumping up the priority percent -
based on the amount of concurrent calls/codecs in use/bandwidth required.
SHOW the output of the service policy to confirm
show policy int x/x
Should see tagged packets increasing in the queue -
and hopefully no drop ;>
-d
Customers interested in purchasing Cisco router or the price, please refer to below links:
