Watson-SHDSL-Router-Manual.doc
Version 1.0-03
Watson SHDSL Router
Operating Manual
3.3.3 VLAN Examples
Figure 3-1
Figure 3-1: VLAN configuration for traffic concentration
shows how the VLAN function can be used for traffic separation:
Ethernet Switch
1
1
Default VLAN Tag
VLAN Port Membership
V
L
A
N
1
VLAN 2
V
L
A
N
3
1, 2, 3
1
2
3
2
3
1
Untagged
ETH1
ETH2
ETH3
ETH4
ETH5
ETH6
ETH7
ETH8
Tagged
WAN
In this example the Switch is configured as 802.1q mode and three Ethernet ports are configured
with different VLAN tags.
Upon ingress into Watson SHDSL router the packets get a default VLAN tag between 1 and 3
based on their ingress port.
All traffic is aggregated to the Switch trunk port (Trunk) which is member of all three VLANs. The
packets egress Watson SHDSL router with VLAN tags, allowing to separate traffic streams from the
three Ethernet ports.
3.4 Quality of Service (QoS)
Quality of Service refers to the capability of a network device to provide better service to selected
network traffic. This is achieved by shaping the traffic and processing higher priority traffic before
lower priority traffic.
Typically the most significant bottleneck of the network is where the high speed LAN meets limited
broadband bandwidth. Special QoS mechanisms is built into Watson SHDSL router to ensure that
this sudden drop in connectivity speed is taken into account when prioritizing and transmitting real-
time service-related data packets.
3.4.1 Traffic Priority
Traffic Priority allows to manage and avoid traffic congestion by defining inbound and outbound pri-
ority rules for each devices attached to Watson SHDSL router. These rules determine the priority
that packets, traveling through the router, will receive. QoS parameters (DSCP marking and packet
priority) are set per packet, on an application basis.
QoS parameters can be set using flexible rules, according to the following parameters:
Source/destination IP address, MAC address or host name
Source/destination ports
Two priority marking methods for packet prioritization are available:
DSCP
Revision: 2007-05-24 3-7
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