Specifications

Watson-Ethernet-Manual.doc
Version 3.3-01
Watson Ethernet
Operating Manual
Revision: 2010-01-20
8-5
8.1.5 VLAN indexing in the Default Context
VLANs are controlled through various tables which are typically indexed by the
VID of the VLAN, e.g. the dot1qVlanIndex which indexes the dot1qVlan-
StaticTable.
For each plug-in the VLAN tables are available in the Card Context and can be
indexed by the VID.
In the Default context however a VID cannot be guaranteed to be unique since
each VLAN on each plug-in can have any VID out of the possible range of 1 ..
4094. An extended VLAN indexing scheme is used in the Default Context to
uniquely identify a VLAN:
Figure 8-4: VLAN indexing in the Default Context
The first two digits of a VLAN index define the slot number, the following 4 digits
define the VID.
Example: index = 102201  plug-in in slot 10, VLAN number 2201.
If the plug-in is inserted in the minirack mechanics or in the tabletop housing for
plug-ins then slot number 16 must be used to index VLANs in the Default Con-
text.
8.1.6 The ifTable
Each Watson Ethernet plug-in creates 15 rows in the ifTable:
 4 rows for the four Ethernet user interfaces (ETH1 – ETH4)
 4 rows for the four internal interfaces between Ethernet Bridge and DSL pro-
cessor (Figure 3-4)
 4 rows for the four DSL Spans DSL1 – DSL4
 3 rows for the three management interfaces MGMT1 (front panel Q inter-
face), MGMT2 (backplane interface) and MGMT3 (internal interface to Ether-
net Bridge)
Interfaces can be administratively enabled and disabled with the ifAdminSta-
tus.
If MAC Defect Signaling is turned off then the ifOperStatus for the internal in-
terfaces is always up(1). If MDS is turned on then the ifOperStatus for the
internal interfaces follows the state of the Ethernet User Interfaces and the DSL
spans.