I have a 3825 with a 1Gb fiber card at one of my sites. Our ISP and MPLS provider hand off a single gigabit fiber to us that contains 2 50MB EVC's.
I need to apply QoS to one of the EVC's and shape them both to 50Mb to avoid upstream rate mismatch bottlenecks. Both of the EVC's generally only push 10Mb during business hours.
Here are the relevant pieces of my current config:
class-map match-all video_class
match access-group name video_traffic
class-map match-all voice_class
match access-group name voice_traffic
class-map match-all control_class
match access-group name control_traffic
class-map match-all precedence_5
match ip precedence 5
class-map match-all precedence_4
match ip precedence 4
class-map match-all precedence_3
match ip precedence 3
!
!
policy-map Set_DSCP
class voice_class
set ip dscp ef
class video_class
set ip dscp af41
class control_class
set ip dscp af31
policy-map Internet_Shaping
class class-default
shape average 50000000
policy-map MPLS_QoS
class precedence_5
priority 5000
class precedence_4
bandwidth 20000
class precedence_3
bandwidth 5000
class class-default
random-detect dscp-based
fair-queue
policy-map MPLS_QoS_Parent
class class-default
shape average 50000000
service-policy MPLS_QoS
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
description To Datacenter L3 PRIVATE Core Switch
ip address 10.9.0.1 255.255.255.252
ip policy route-map FromEPToWAN
duplex full
speed 1000
media-type rj45
!
service-policy input Set_DSCP
!
interface GigabitEthernet0/1
description *** RAW PUBLIC LINK to Firewalls ***
ip address X.X.X.X 255.255.255.0
ip policy route-map FromPUBToInternet
duplex auto
speed auto
media-type rj45
!
!
interface GigabitEthernet0/0/0
description Uplink to ISP (EVC's)
no ip address
negotiation auto
!
!
interface GigabitEthernet0/0/0.1
description Private WAN
encapsulation dot1Q 409
ip address X.X.X.X 255.255.255.252
ip policy route-map FromWANToEP
service-policy output MPLS_QoS_Parent
!
interface GigabitEthernet0/0/0.2
description Public
encapsulation dot1Q 684
ip address X.X.X.X 255.255.255.252
service-policy output Internet_Shaping
!
When I run UDP stream tests (various rates from 500k-6m that are marked as AF41) to one of my other sites I am consistently getting about 2% packet loss, despite the fact the circuit isn't even close to 50% saturation. When I remove Shaping and QoS all together, the issue nearly clears itself up, except during peak hours and I get small bursts of packet loss, which is still unacceptable.
When the pipe is at near zero utilization (after hours) there also is no packet loss with or with out the shaping/qos applied.
Is there something I can alter in my config to correct the issue? This was my first stab at heirarchal policies with traffic shaping with QoS, but something isn't working right.
Many thanks in advance.
