Hi:
I have a strange problem with QoS. I have a QoS configuration in a Hub-and-spoke topology. When traffic begins to expand the VoIP calls are broken. But the strange thing is that bandwidth does not reach the bandwidth limit, and neither of the two classes collapses at any time, and for this reason when I see the show policy-map interface statistics I don’t see drop packets. It is very strange.
These are configurations:
HUB device
=========
class-map match-any REALTIME_QOS
match dscp ef
!
class-map match-any REALTIME_MARK
match access-group name REALTIME_ACL
match protocol h323
match protocol rtp
match protocol rtcp
!
# 10.10.10.0 255.255.254.0 is the VoIP Call Manager network in the Data Center
# Hub device is in the Data Center
ip access-list extended REALTIME_ACL
permit ip 10.10.10.0 0.0.1.255 any
!
policy-map QoS_300M
class REALTIME_QOS
priority
police 110000000 conform-action transmit exceed-action drop
class class-default
bandwidth remaining percent 100
random-detect dscp-based
!
policy-map SHAPPING_300M
class class-default
shape average 300000000
service-policy QoS_300M
!
policy-map DSCP_MARK
class REALTIME_MARK
set dscp ef
class class-default
set dscp af31
!
interface Tunnel25
description GRE tunnel
ip address x.x.x.x x.x.x.x
< Omitted Commands >
ip tcp adjust-mss 1356
qos pre-classify
tunnel source GigabitEthernet0/0/1
tunnel destination x'.x'.x'.x'
!
interface GigabitEthernet0/0/0
description LAN Interface
ip address y.y.y.y y.y.y.y
< Omitted Commands >
service-policy input DSCP_MARK
!
interface GigabitEthernet0/0/1
description WAN Interface
ip address z.z.z.z z.z.z.z
< Omitted Commands >
service-policy output SHAPPING_600M
SPOKE device
===========
class-map match-any REALTIME_QOS
match dscp ef
!
class-map match-any REALTIME_MARK
match access-group name REALTIME_ACL
match protocol h323
match protocol rtp
match protocol rtcp
!
# 10.10.10.0 255.255.254.0 is the VoIP Call Manager network in the Data Center
# Spoke is in a remote site
ip access-list extended REALTIME_ACL
permit ip any 10.10.10.0 0.0.1.255
!
policy-map QoS_100M
class REALTIME_QOS
priority
police 20000000 conform-action transmit exceed-action drop
class class-default
bandwidth remaining percent 100
random-detect dscp-based
!
policy-map SHAPPING_100M
class class-default
shape average 100000000
service-policy QoS_100M
!
policy-map DSCP_MARK
class REALTIME_MARK
set dscp ef
class class-default
set dscp af31
!
interface Tunnel25
ip address x'.x'.x'.x' x'.x'.x'.x'
< Omitted Commands >
ip tcp adjust-mss 1356
qos pre-classify
tunnel source GigabitEthernet0/0
tunnel destination x.x.x.x
!
!
interface GigabitEthernet0/0
description WAN Interface
ip address y.y.y.y y.y.y.y
< Omitted Commands >
!
interface GigabitEthernet0/1
< Omitted Commands >
!
interface GigabitEthernet0/1.50
description LAN Subinterface
encapsulation dot1Q 50
ip address z.z.z.z z.z.z.z
<Omitted commands>
service-policy input DSCP_MARK
Could you help me?
Thank you.
Best regards
