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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.

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