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W5-Ethernet-Manual.doc
Version 2.0-01
Watson 5 Ethernet
Operating Manual
Revision: 2006-04-27 8-3
The entAliasMappingTable defines the relation between the ports and the ifIndex
from the ifTable used in all other tables to index a port.
Slot 2
container
Subrack
chassis
Slot n
container
Slot 1
container
Plugin
module
Port 2
port
Port n
port
Port 1
port
Figure 8-2 Entity MIB entPhysicalTable
There is on row in the entLogicalTable which describes the master agent. The relation be-
tween the master agent and its plugin card defined in the entLPMappingTable.
8.1.4 VLAN indexing
VLANs are controlled through various tables which are typically indexed by the VID of the VLAN,
e.g. the dot1qVlanIndex which indexes the dot1qVlanStaticTable.
The management system sees one set of VLAN tables within a subrack. Internally each subagent
handles a number of rows within these tables. Because each VLAN on each plugin can have any
VID out of the possible range of 1 .. 4094 a VID cannot be guaranteed to be unique within a
subrack.
To make the index into the VLAN tables unique an extended indexing scheme is used:
VID (4 digits)
Slot number
(2 digits)
Figure 8-3: VLAN indexing
The first two digits of the index define the slot number, the following 4 digits define the VID.
Example: SNMP index = 102201 " plugin in slot 10, VLAN number 2201.
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