Specifications

W5-Ethernet-Manual.doc
Version 2.0-01
Watson 5 Ethernet
Operating Manual
Revision: 2006-04-27 3-23
To access MGMT3 from a user interface this user interface (ETH1 .. ETH4) has to be member of
the management VLAN. To access MGMT3 through the DSL Ethernet payload the corresponding
DSL port (DSL1 .. DSL4) has to be member of the management VLAN.
3.5.5 Management VLAN with transparent bridging
The Watson 5 Ethernet plugin supports a special bridging mode that allows for inband management
in combination with transparent bridging. This bridging mode uses stacked VLAN tags for packets
from the Ethernet user interfaces and single-tagged packets for management information on the
DSL interfaces:
ETH1
ETH2
ETH3
ETH4
s1
s2
s3
m
s4
DSL: Stacked tags for customer VLANs
Single tag for management VLAN
Default VLAN Tag
VLAN Port Membership
m
Customer side (CPE) Central Office side (CO)
c1
c2
c3
c4
c
cs
Ethernet packet with single customer tag
Ethernet packet with stacked tags (1 customer, 1 service provider tag)
Ethernet packet
c1s1
c2s2
c3s3
c4s4 m
m
m
m mgmt
ETH1
ETH2
ETH3
ETH4
s1
s2
s3
s4
ControllerController
MGMT3 MGMT3
m m
mgmt
mgmt
mgmt
mgmtmgmt
Q
c1
c2
c3
c4
mgmt
Ethernet packet carrying inband management information
Ethernet: single VLAN tags Ethernet: single VLAN tags
mgmt
Figure 3-18: Management VLAN configuration with transparent bridging
Management packets ingressing at the Q – interface of the Central Office are routed to port
MGMT3 of the management controller. There they are tagged with the default VLAN tag m and are
sent as single-tagged packets over the DSL to the Watson 5 Ethernet plugin at the Customer side.
At the Customer side the outer tag is stripped off, leaving management packets untagged. VLAN
switching will send these packets to port MGMT3 which is member of VLAN m.
Single-tagged packets ingressing at ports ETH1 .. ETH4 of the CPE modem will be tagged with an
outer tag s1 .. s4 depending on their ingress port and then sent over the DSL. At the CO side the
outer tag is stripped off, leaving single-tagged packets egressing the CO modem at ETH1 .. ETH4.
3.6 G.826 Performance Monitoring
Watson 5 Ethernet modems support performance monitoring as specified in ITU-T G.826. The
G.826 error performance parameters provide quantitative performance information of a specific
loop. They are intended to be used for long-term evaluation of operating DSL links.