Hardware Reference
13
C613-03059-00 REV F
Content Addressable Memory (CAM)
AT-9800 Series switches ship with 40 k-entries of CAM, as standard. This
memory is divided into three fixed allocations:
■
8 k for MAC address tables
■
4 k for VLAN entries
■
28 k for all other L2/L3 tables , such as IP route entries
CAM can be expanded through the purchase and installation of lineCAM.
LineCAM is a 192 k-entry plug-in module that extends the Layer 2/Layer 3
forwarding database from 40 k to 232 k. One lineCAM module can be installed
in each AT-9800 series switch.
When lineCAM is installed, the memory allocations are:
■
8 k for MAC address tables
■
4 k for VLAN entries
■
220 k for all other L2/L3 tables
LineCAM can be ordered as a pre-installed item when purchasing a switch, or
can be purchased separately. For more information, contact your authorised
Allied Telesis distributor or reseller.
To check how much CAM is installed, use the command:
show switch
For information on installing CAM, see
“Restricted Procedures” on page 31
.
Dual In-line Memory Modules (DIMMs)
Synchronous DRAM for AT-9800 Series switches is provided by a single
DIMM. Two memory sizes are supported, 128 MBytes and 256 MBytes.
Warning
Only Allied Telesis supplied DIMMs are tested and approved for use
with AT-9800 Series switches. Using DIMM that has not been tested and
approved may cause unreliable operation and will invalidate the switch’s
warranty.
To check how much DIMM is installed, use the command:
show switch
For information on installing DIMMs, see
“Restricted Procedures” on page 31
.
