Specifications

Watson SHDSL Router
Operating Manual
Watson-SHDSL-Router-Manual.doc
Version 1.1-07
3-8 Revision: 2012-02-15
group containing up to 4,094 customer VLANs. This allows a service provider to
provide different service, based on specific VLANs, for many different customers.
A service provider's customer may require a range of VLANs to handle multiple
applications. A service provider's customer can assign his own inner VLAN tags
on ports for these applications. The service provider can assign an outer VLAN
tag for each customer. Therefore, there is no VLAN tag overlap among custom-
ers, so traffic from different customers is kept separate.
In Bridge mode the Watson has two VLAN stacking mode:
In ‘Transparent’ mode VLAN stacked frames (“double-tagged” frames) will be
transparently bridged through the device
In ‘Rule Based’ mode an outer VLAN tag will be added to the frames when a set
of rules will be matched.
3.3.4 VLAN Examples
Figure 3-1 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
Figure 3-1: VLAN configuration for traffic concentration
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 be-
tween 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, allow-
ing 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 are 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 da-
ta packets.