Hello,
We use WS-C2960S-48FPD-L access switches that we connect our Cisco 7841 IP phones into. All access switches connect into our core switch, which is a WS-C4500X-32. I am pretty comfortable with the QoS configuration I have applied on our 2960 access switches but not so sure on the configuration on our Core, 4500X-32.
QoS Config on the 2960 Access Switch
1) Can someone validate my QoS config on my 2960 access switch? I have done some Wireshark captures on the access switch and the phone traffic is being marked correctly with DSCP 46(EF) and SIP CS3, so I think it’s working.
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7
mls qos srr-queue output cos-map queue 3 threshold 3 2 4
mls qos srr-queue output cos-map queue 4 threshold 2 1
mls qos srr-queue output cos-map queue 4 threshold 3 0
mls qos srr-queue output dscp-map queue 1 threshold 3 40 41 42 43 44 45 46 47
mls qos srr-queue output dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55
mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63
mls qos srr-queue output dscp-map queue 3 threshold 3 16 17 18 19 20 21 22 23
mls qos srr-queue output dscp-map queue 3 threshold 3 32 33 34 35 36 37 38 39
mls qos srr-queue output dscp-map queue 4 threshold 1 8
mls qos srr-queue output dscp-map queue 4 threshold 2 9 10 11 12 13 14 15
mls qos srr-queue output dscp-map queue 4 threshold 3 0 1 2 3 4 5 6 7
mls qos queue-set output 1 threshold 1 138 138 92 138
mls qos queue-set output 1 threshold 2 138 138 92 400
mls qos queue-set output 1 threshold 3 36 77 100 318
mls qos queue-set output 1 threshold 4 20 50 67 400
mls qos queue-set output 2 threshold 1 149 149 100 149
mls qos queue-set output 2 threshold 2 118 118 100 235
mls qos queue-set output 2 threshold 3 41 68 100 272
mls qos queue-set output 2 threshold 4 3100 3100 100 3200
mls qos queue-set output 1 buffers 15 15 10 60
mls qos queue-set output 2 buffers 15 15 10 60
mls qos
The access ports that have a Cisco IP Phone connected to them configured as follows:
interface GigabitEthernet1/0/34
switchport access vlan 36
switchport mode access
switchport voice vlan 6
priority-queue out
mls qos trust device cisco-phone
mls qos trust dscp
spanning-tree portfast
The two trunk ports connecting to the Core Switch (4500X-32) are configured as follows:
interface TenGigabitEthernet1/0/1
description Primary Trunk Link to Catalyst 4500 Switch
switchport mode trunk
mls qos trust dscp
channel-group 1 mode desirable
ip dhcp snooping trust
!
interface TenGigabitEthernet1/0/2
description Secondary Trunk Link to Catalyst 4500 Switch
switchport mode trunk
mls qos trust dscp
channel-group 1 mode desirable
ip dhcp snooping trust
Qos Config on the 4500X-32
On the 4500X-32 Core switch I have configured class-maps and policy-maps but have yet to apply a service policy to the trunks connections back to the access switches. Not sure if this is right or what I am missing.
2) How do I configure ingress and egress QoS on the 4500X-32. I am assuming ingress would be service-policy input and egress would be service-policy output? Can you have a input and an output service-policy applied to the same interface? What are some commands that I could run on the Cisco 4500X to confirm my QoS config and to verify that traffic is passing through while preserving the DSCP EF markings?
class-map match-any Scavenger-Queue
match dscp cs1
class-map match-any Control-Mgmt-Queue
match dscp cs7
match dscp cs6
match dscp cs3
match dscp cs2
class-map match-any Trans-Data-Queue
match dscp af21
match dscp af22
match dscp af23
class-map match-any Multimedia-Stream-Queue
match dscp af31
match dscp af32
match dscp af33
class-map match-any Priority-Queue
match dscp ef
match dscp cs5
match dscp cs4
class-map match-any Bulk-Data-Queue
match dscp af11
match dscp af12
match dscp af13
class-map match-any Multimedia-Conf-Queue
match dscp af41
match dscp af42
match dscp af43
policy-map OUTPUT-QUEUING-NOPOLICING
class Scavenger-Queue
bandwidth remaining percent 1
class Priority-Queue
priority
class Control-Mgmt-Queue
bandwidth remaining percent 10
class Multimedia-Conf-Queue
bandwidth remaining percent 10
class Multimedia-Stream-Queue
bandwidth remaining percent 10
class Trans-Data-Queue
bandwidth remaining percent 10
dbl
class Bulk-Data-Queue
bandwidth remaining percent 4
dbl
class class-default
bandwidth remaining percent 25
dbl
