QoS — Switch Datacom

Versão testada

DmOS 21.1 (DM2500 / DM4370 / DM4610). Compatível com DmOS 19.x+.

Conceitos de QoS no DmOS

Termo	Descrição
Policer	Controle de banda (limitar tráfego)
Shaper	Conformação de taxa (suavizar rajadas)
Queue	Fila de saída (8 prioridades)
DSCP	Differentiated Services Code Point (6 bits no IP)
CoS	Class of Service (3 bits no 802.1Q)
Remark	Reescrever DSCP/CoS no pacote

Policiamento de Banda (Traffic Policing)

Criar Policy-Map para Limitar Banda

# Criar class-map para identificar tráfego
DM(config)# class-map match-any CLIENTES-100M
DM(config-cmap-CLIENTES-100M)# match any
DM(config-cmap-CLIENTES-100M)# exit

# Criar policy-map com policer
DM(config)# policy-map PM-100MBPS
DM(config-pmap-PM-100MBPS)# class CLIENTES-100M
DM(config-pmap-PM-100MBPS-c-CLIENTES-100M)# police rate 100000 kbps burst 1000 kbyte
DM(config-pmap-PM-100MBPS-c-CLIENTES-100M)# conform-action transmit
DM(config-pmap-PM-100MBPS-c-CLIENTES-100M)# exceed-action drop
DM(config-pmap-PM-100MBPS-c-CLIENTES-100M)# exit
DM(config-pmap-PM-100MBPS)# exit

# Aplicar na interface (entrada)
DM(config)# interface ethernet 0/1
DM(config-if-eth0/1)# service-policy input PM-100MBPS
DM(config-if-eth0/1)# exit

Policer por VLAN

DM(config)# class-map match-all VLAN-CLIENTES
DM(config-cmap-VLAN-CLIENTES)# match vlan 10
DM(config-cmap-VLAN-CLIENTES)# exit

DM(config)# policy-map PM-VLAN-100M
DM(config-pmap)# class VLAN-CLIENTES
DM(config-pmap-c)# police rate 100000 kbps
DM(config-pmap-c)# conform-action transmit
DM(config-pmap-c)# exceed-action drop
DM(config-pmap-c)# exit
DM(config-pmap)# exit

Marcação DSCP (Remarking)

# Marcar pacotes com DSCP EF (voz/prioridade alta)
DM(config)# class-map match-all VOIP-TRAFFIC
DM(config-cmap-VOIP-TRAFFIC)# match vlan 20
DM(config-cmap-VOIP-TRAFFIC)# exit

DM(config)# policy-map PM-REMARK-VOIP
DM(config-pmap)# class VOIP-TRAFFIC
DM(config-pmap-c)# set dscp ef
DM(config-pmap-c)# exit
DM(config-pmap)# exit

DM(config)# interface ethernet 0/1
DM(config-if-eth0/1)# service-policy input PM-REMARK-VOIP
DM(config-if-eth0/1)# exit

Filas de Saída (Queuing)

O DmOS suporta 8 filas por porta com prioridade estrita (SP) ou WFQ:

# Configurar mapeamento DSCP → fila
DM(config)# qos dscp-map
DM(config-dscp-map)# dscp ef queue 7         # VoIP → fila 7 (alta prioridade)
DM(config-dscp-map)# dscp af41 queue 5       # Video → fila 5
DM(config-dscp-map)# dscp default queue 0    # Best-effort → fila 0
DM(config-dscp-map)# exit

# Configurar filas na interface
DM(config)# interface ethernet 0/24
DM(config-if-eth0/24)# queue strict-priority 7   # fila 7 tem prioridade estrita
DM(config-if-eth0/24)# queue weight 6 20         # fila 6 — 20% largura de banda
DM(config-if-eth0/24)# queue weight 0 5          # fila 0 — 5% largura de banda
DM(config-if-eth0/24)# exit

Storm Control

Limitar tráfego broadcast/multicast/unicast desconhecido:

DM(config)# interface ethernet 0/1
DM(config-if-eth0/1)# storm-control broadcast level 10    # 10% de banda máxima
DM(config-if-eth0/1)# storm-control multicast level 10
DM(config-if-eth0/1)# storm-control unicast level 20
DM(config-if-eth0/1)# storm-control action shutdown       # desliga porta se exceder
DM(config-if-eth0/1)# exit

Verificar QoS

DM# show policy-map
DM# show policy-map interface ethernet 0/1
DM# show class-map
DM# show qos interface ethernet 0/1
DM# show interface ethernet 0/1 counters