11-09-2009 02:30 PM - edited 03-17-2019 09:52 PM
Just recently bought a 2811 router to service our WAN sites and prepare us with the implementation of VoIP. We have got Alcatel boxes at the main campus and at the remote site. For the VoIP protocol,Voice traffic will be through RTP that will be transported by UDP. For Qos, we use both TOS and Diffserve, 46. Using G729 codec
The router will not terminate the voice. The Alcatel boxes will be the voice gateways. Just want to apply QoS for the voice traffic that pass through Ethernet and the WAN ports(1841) on remote site and also at the main campus (2811). Got a 1024kbps lease circuit from our telco between main campus and remote site. Just need help in configuring QoS so that I can provide a good voice quality on extension calls (4 to 8 simultaneous calls) between the main campus and the remote site using our lease circuit. Was thinking of Autoqos Voip but I beleive my IOS versions doesn't support that. What is your advice on manual QoS and Autoqos voip ?
IOS Version as follows:
1841 - Remote site
------------------
Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(25b), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 12-Aug-09 10:49 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
ciscoCETC uptime is 21 hours, 13 minutes
System returned to ROM by power-on
System image file is "flash:c1841-ipbase-mz.124-1c.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
Cisco 1841 (revision 7.0) with 115712K/15360K bytes of memory.
Processor board ID FHK121820Q1
2 FastEthernet interfaces
1 Serial(sync/async) interface
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
31360K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
2811- main campus
------------------
Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(15)T9, RELEASE SOFTWARE (fc5)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Tue 28-Apr-09 13:10 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T11, RELEASE SOFTWARE (fc1)
teika uptime is 6 days, 23 hours, 41 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-ipbase-mz.124-15.T9.bin"
Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.
Processor board ID FHK1339F08U
2 FastEthernet interfaces
4 Serial(sync/async) interfaces
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
Solved! Go to Solution.
11-16-2009 03:50 AM
11-10-2009 05:46 AM
I'm not much of a fan of AutoQoS on routers, although on switches, perhaps.
From what you've described, your most likely point of congestion might be the WAN link. You might want to try a simple QoS policy such as:
(NB: syntax might be incorrect)
class-map match-any real-time
match ip dscp EF
policy-map sample
class real-time
priority percent 33
class class-default
fair-queue
interface serial #
service-policy output sample
tx-ring-limit 2
You might also need to consider QoS on the LAN.
11-10-2009 01:08 PM
Thanks for the response. Can you point me to a document related to this or have an example as this. Need to read up a bit be fore setting this up
Let me know
11-10-2009 03:06 PM
We are also planning to use video conference on this link. Will this sample config be suffice for video conference as well. We are currently using polycom units.
Hope someone helps
11-10-2009 06:41 PM
Yes, you would just need to also match against the polycom DSCP markings (and insure you have enough bandwidth - you might not for both). You might want to place video in its own LLQ class.
11-10-2009 06:39 PM
Don't have a specific document reference for what I've provided.
11-11-2009 02:59 PM
Thanks. I manage to get the docs from cisco site
Thank you once again for your advice
11-12-2009 03:08 PM
I have write up this and want to see if this is fine for 33 percent of traffic for voice, 25 percent for video, 16K for voice signal and the rest for other traffic. Let me know:
class-map match-all video-traffic
match access-group 101
class-map match-all voice-traffic
match access-group 102
class-map match-all voice-signaling
match access-group 103
policy-map voip-video-policy
class video-traffic
priority 25
class voice-traffic
priority 33
set dscp ef
class voice-signaling
bandwidth 16
class class-default
fair-queue
interface Serial0/0/1
description LINK TO CETC-168350
bandwidth 1024
ip address 192.168.1.5 255.255.255.252
service-policy output voip-video-policy
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip route-cache flow
access-list 101 permit tcp any any range 3230 3231
access-list 101 permit udp any any range 3230 3235
access-list 102 permit udp any any range 16384 32767
access-list 103 permit tcp any eq 1720 any
access-list 103 permit tcp any any eq 1720
11-12-2009 05:06 PM
Recall Cisco suggests not using more than about 1/3 link bandwidth for LLQ. Your video and voice allow up to 58 %(?), so as I commented before, you might have insufficient bandwidth for both. (NB: believe they make this suggestion to allow sufficient bandwidth for other traffic, but also assuming both your VoIP and video is VBR, you also often need to have some cushion of bandwidth for bursts and at close to 60%, you might not have enough burtable bandwidth.)
Although "the book" shows placing signaling within its own class, I've found dropping in within class-default FQ or adding to the voice LLQ also seems to work well.
11-15-2009 04:15 PM
Thanks for your response. Went through a couple of documents and was thinking of giving 9% to Voice i.e 11.2 Kbps per G729 call. So 11.2Kbps x 8 = 89.6Kbps dedicated for voice and on my polycom unit I notice that it is setup to 128K so allocate 128K for Video. Which in total of voice and video is 22% of 1024Kbps. Is that okay ?
11-16-2009 03:50 AM
"Is that okay ? "
Seems reasonable.
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