on the access switches 4507 do
match the vlan 118 traffic on each port connected to that vlan asmuming the vlan 118 ips is 10.1.118.0/24
access-list 118 permit udp 10.1.118.0 0.0.0.255 any range 16384 32767
class-map vlan118
match access-group 118
qos dbl
! Globally enables DBL
qos dbl exceed-action ecn
! Optional: Enables DBL to mark RFC 3168 ECN bits in the IP ToS Byte
class-map match-any PQ
match access-group 118
match ip dscp ef
match ip dscp cs4
! Classifies traffic mapped to PQ for exclusion of DBL-policy
policy-map DBL
class PQ
! No action (DBL or otherwise) is applied on traffic mapped to PQ
class class-default
dbl
! Enables DBL on all (other) traffic flows
! This section configures the DSCP-to-Transmit Queue Mappings
qos map dscp 0 to tx-queue 2
! Maps DSCP 0 (Best Effort) to Q2
qos map dscp 8 10 12 14 to tx-queue 1
! Maps DSCP CS1 (Scavenger) and AF11/AF12/AF13 (Bulk) to Q1
qos map dscp 16 18 20 22 to tx-queue 4
! Maps DSCP CS2 (Net-Mgmt) and AF21/AF22/AF23 (Transactional) to Q4
qos map dscp 24 26 28 30 to tx-queue 4
! Maps DSCP CS3 (Call-Sig) and AF31/AF32/AF33 (MultiMedia) to Q4
qos map dscp 34 36 38 to tx-queue 4
! Maps DSCP AF41/AF42/AF43 (Interactive-Video) to Q4
qos map dscp 32 46 to tx-queue 3
! Maps DSCP CS4 (TelePresence) and EF (VoIP) to Q3 (PQ)
qos map dscp 48 56 to tx-queue 4
! Maps DSCP CS6 (Internetwork) and CS7 (Network Control) to Q4
! This section configures queues, activates the PQ and applies DBL
interface range GigabitEthernet1/1 - 48
tx-queue 1
bandwidth percent 5
! Q1 gets 5% BW
tx-queue 2
bandwidth percent 35
! Q2 gets 35% BW
tx-queue 3
priority high
! Q3 is PQ
bandwidth percent 30
! Q3 (PQ) gets 30% BW
shape percent 30
! Shapes/limits PQ to 30% BW
tx-queue 4
bandwidth percent 30
! Q4 gets 40%
service-policy output DBL
! Applies DBL to all flows except VoIP & video
Although tail-drop or WRED thresholds are not supported on the catalyst 4500, it does support one of the most advanced congestion-avoidance mechanisms in the catalyst family. This congestion-avoidance feature is performed by dynamic buffer limiting (DBL). DBL tracks the queue length for each traffic flow in the switch and, when the queue length of a flow exceeds its limit, drops packets or sets the (RFC 3168) explicit congestion notification (ECN) bits in the IP packet headers. Of course, setting ECN bits is of value only if the end-point applications also support ECN
above base don cisco telepresence QoS design
please if helpful Rate
