The issue is DSCP is preserved from SiteA to SiteB whereas DSCP marking is not preseved from SiteB to SiteA.
(Site A) Phone----Cisco 3560 SW----Cisco 1921 Router========(Bonded T1)=========Cisco 1921 Router-----Cisco 2960 SQ---Phone (Site B)
Site A Config (on 1921 Router):==========
controller T1 0/0/0
cablelength short 110
channel-group 0 timeslots 1-24
!
controller T1 0/0/1
cablelength short 110
channel-group 0 timeslots 1-24
!
!
class-map match-all SiteA-CLASS-VOICE
match ip dscp ef
!
!
policy-map SiteA-POLICY-VOICE
class SiteA-CLASS-VOICE
priority percent 35
!
!
interface Multilink1
ip address 10.10.10.2 255.255.255.252
no ip redirects
no ip unreachables
ppp multilink
ppp multilink group 1
ppp multilink fragment disable
no cdp enable
service-policy output SiteA-POLICY-VOICE
!
interface GigabitEthernet0/0
ip address 192.168.1.49 255.255.255.0
no ip redirects
no ip unreachables
duplex auto
speed auto
service-policy output SiteA-POLICY-VOICE
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/0/1:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
!
***************************************************************************************
Site B Config (on 1921 Router):=======
controller T1 0/0/0
clock source internal
cablelength short 110
channel-group 0 timeslots 1-24
!
controller T1 0/0/1
clock source internal
cablelength short 110
channel-group 0 timeslots 1-24
!
!
class-map match-all SiteB-CLASS-VOICE
match ip dscp ef
!
!
policy-map SiteB-POLICY-VOICE
class SiteB-CLASS-VOICE
priority percent 35
class class-default
fair-queue
!
!
interface Tunnel1
no ip address
!
interface Multilink1
ip address 10.10.10.1 255.255.255.252
no ip redirects
no ip unreachables
ppp multilink
ppp multilink group 1
ppp multilink fragment disable
no cdp enable
service-policy output SiteB-POLICY-VOICE
!
interface GigabitEthernet0/0
ip address 10.20.30.1 255.255.255.0
no ip redirects
no ip unreachables
ip flow ingress
ip flow egress
duplex auto
speed auto
service-policy output SiteB-POLICY-VOICE
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/0/1:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
!
***************************************************************************************
Output of "show policy-map interface Multilink1" on Cisco 1921 Router at SiteB:
====>>>>>>>>>>>>>>>>>
Multilink1
Service-policy output: SiteA-POLICY-VOICE
queue stats for all priority classes:
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 462007/93479526
Class-map: SiteA-CLASS-VOICE (match-all)
462007 packets, 93479526 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
Priority: 35% (1075 kbps), burst bytes 26850, b/w exceed drops: 0
Class-map: class-default (match-any)
31243043 packets, 4643228349 bytes
5 minute offered rate 6000 bps, drop rate 0 bps
Match: any
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/7/0
(pkts output/bytes output) 31243036/4431006764
***********************************************************************************************************
Output of "show policy-map interface Multilink1" on Cisco 1921 Router at SiteB:
====>>>>>>>>>>>>>>>>>
Multilink1
Service-policy output: SiteB-POLICY-VOICE
queue stats for all priority classes:
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 0/0
Class-map: SiteB-CLASS-VOICE (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
Priority: 35% (1075 kbps), burst bytes 26850, b/w exceed drops: 0
Class-map: class-default (match-any)
36561971 packets, 31606577408 bytes
5 minute offered rate 6000 bps, drop rate 0 bps
Match: any
Queueing
queue limit 64 packets
(queue depth/total drops/no-buffer drops/flowdrops) 0/70746/0/70720
(pkts output/bytes output) 36491225/31471175701
Fair-queue: per-flow queue limit 16
******************************************************************************
Can anyone figure out what is wrong with this config ?
