VoIP QOS on 887VA (and also 861)

grunger106 · ‎01-19-2012

Hi

I have a 887VA in a live environment that needs QOS for VoIP - choppy calls....

I'm a novice with QOS, so have been playing with my 861.

This is what I'm trying...

ip access-list extended VOIP
permit tcp any any range 6000 6049
permit tcp any any eq 5060

class-map match-any VoIP
match access-group name VOIP

policy-map VOIPQOS
class VoIP
priority percent 50
set dscp ef
class class-default
fair-queue

interface FastEthernet4

bandwidth 800

ip nbar protocol-discovery

service-policy output VOIPQOS

I a few questions....

1. - Is this correct generally - will this priortise VoIP traffic over everything else.

2. - Should this be on fa4 or dialer0 - it's PPPoE, or doesn't it matter since FA4's upstream is dialer0 anyway

3. - The router that really needs this is an 887, so which interface do I put this on - ATM0?

4. - I get an error on the set dscp ef command on the 861 - is this because I'm wrong, or the 861 doesn't do this, and what ramifications will this have?

Sorry for the probably dumb questions, but my Cisco knowlege is learnt in the field - so VPNs etc I'm happy with but QOS is a dark hole at the moment!

Thanks!

Neeraj Arora · ‎01-24-2012

1. Generally yes, this config is good enough for prioritizing voice traffic going out of Serial or Fast Ethernet interfaces. The only thing I would like to mention here is the ACL being used, generally I have seen the following ACL for Cisco Voice devices:

access-list 102 permit udp any any range 16384 32767

access-list 102 permit tcp any any eq 1720

(the above are actually the ports Cisco devices use.......1720 for call setup and range 16384 32767 for the RTP stream)

2. "Service-policy output" command should be on Dialer interface

3. For ATM interface, there is a difference in how QOS is applied. I am not an expert on ATM so I can only point you towards the document which explains it

Documents that should prove useful:

** Configuring CBWFQ and LLQ on MLPPP and Dialer Interfaces

http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094ad2.shtml

** QoS Solutions for PPPoE and DSL Environments

http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800b2d29.shtml

** Understanding the VBR-nrt Service Category and Traffic Shaping for ATM VCs

http://www.cisco.com/en/US/tech/tk39/tk51/technologies_tech_note09186a0080102a42.shtml

Hope the above information helps

Neeraj

michaelba4 · ‎04-26-2014

hello, my name is michael and i'm trying to configure the same oqs setting as grunger106 i have cisco 887va.

I know this response was recorded a long time ago but still ask for your help.

I set grunger106 script above and i put Service-policy output" command on Dialer 0 interface but its still don"t work. i still have jitter and delays.

i'm adding the configuration :

no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Mornex
!
boot-start-marker
boot-end-marker
!
!
enable password *****
!
no aaa new-model
!
!
ip cef
!
!
!
ip dhcp excluded-address 192.168.1.254
!
ip dhcp pool Local_DHCP_Pool
import all
network 192.168.1.0 255.255.255.0
default-router 192.168.1.254
lease 0 0 30
!
!
!
no ipv6 cef
!
!
license udi pid C887VA-W-E-K9 sn **********
!
!
username ****** password 0 ******
!
!
!
!
!
controller VDSL 0
!
!
class-map match-any VoIP
match access-group name VOIP
!
policy-map VOIPQOS
class VoIP
priority percent 50
set dscp ef
class class-default
fair-queue
!
!
!
!
!
!
!
!
!
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
!
interface Ethernet0
description -WAN$
no ip address
pppoe enable group global
pppoe-client dial-pool-number 2
pppoe-client dial-pool-number 1
!
interface FastEthernet0
switchport access vlan 20
no ip address
!
interface FastEthernet1
switchport access vlan 20
no ip address
!
interface FastEthernet2
switchport access vlan 20
no ip address
!
interface FastEthernet3
switchport access vlan 20
no ip address
!
interface Wlan-GigabitEthernet0
description Internal switch interface connecting to the embedded AP
switchport mode trunk
no ip address
!
interface wlan-ap0
description Service module interface to manage the embedded AP
ip address 192.168.168.2 255.255.255.0
!
interface Vlan1
no ip address
!
interface Vlan20
ip address 192.168.1.254 255.255.255.0
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1412
!
interface Dialer0
bandwidth 800
ip address negotiated
ip mtu 1452
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly in
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username ******* password 0 ******
ppp ipcp dns request
ppp ipcp address accept
service-policy output VOIPQOS
!
ip forward-protocol nd
ip http server
ip http authentication local
no ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip nat inside source list 1 interface Dialer0 overload
ip route 0.0.0.0 0.0.0.0 Dialer0
!
ip access-list extended VOIP
permit udp any any range 10000 20000
permit udp any any range 5060 5062
!
access-list 1 permit 192.168.1.0 0.0.0.255
dialer-list 1 protocol ip permit
!
snmp-server community highnet RO mgt
!
!
line con 0
no modem enable
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
stopbits 1
line vty 0 4
privilege level 15
login local
transport input telnet ssh
!
scheduler max-task-time 5000
scheduler allocate 20000 1000
ntp server 172.23.3.241
!
end