QoS over PPPoA

[GM2005]

Has anyone implemented Quality of Service on a UK ADSL service, using PPPoA, on a Cisco router? If so, could you point me in the direction of some literature on it please? I've seen plenty of articles but none seem to relate to the parameters above.

 

[KiscoKid]

I've done a fair bit of this. You configure QoS over PPPoA just like you would over most ATM interfaces. You must enable VC shaping before you can apply a service policy.

The following doc gives some pointers how to calculate PCR, SCR etc for VC shaping.

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080094460.shtml#topic1

Once you've configured VC shaping, you can go ahead and configure queue management for instance (like CBWFQ). The following doc shows how to do this:

http://www.cisco.com/en/US/tech/tk39/tk824/technologies_configuration_example09186a0080094cf6.shtml

Sometimes examples are better. Here's a config of a router using QoS over PPPoA I configured recently. As you can, it's performing QoS against all terminal server traffic over a PPPoA connection.



version 12.3
!
!
!
class-map match-all RDPCM
match access-group 100
!
!
policy-map PM2
class RDPCM
priority 50
class class-default
fair-queue
random-detect
!
interface ATM0
no ip address
no atm ilmi-keepalive
pvc 0/38
vbr-nrt 113 113 190
encapsulation aal5mux ppp dialer
dialer pool-member 1
service-policy output PM2
!
dsl operating-mode auto
!
interface Dialer0
bandwidth 1000
ip address 10.21.0.9 255.255.255.248
ip access-group 199 in
encapsulation ppp
dialer pool 1
ppp chap hostname xxx
ppp chap password 7 xxxx
!
access-list 100 remark Windows Terminal Server Traffic
access-list 100 permit tcp any any eq 3389
access-list 100 permit tcp any eq 3389 any

Hope this helps