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OF-DPA Table Sizes

Broadcom Switches feature internal memory that can be freely assigned to increase available memory for various functions. BISDN Linux 4.6 and later support defining strategies how the memory should be used.

Currently four strategies are supported:

Strategy Description
default use the platform default
balanced allocate evenly to Layer 2 and Layer 3 tables
layer2 maximize Layer 2 table size
layer3 maximize Layer 3 table size

Selecting the strategy

The strategy can be changed by editing /etc/default/ofdpa

# -l, --l2l3mode=L2L3MODE    How to allocate memory to L2/L3 tables
# Valid modes are:
#       default         use platform defaults
#       balanced        allocate evenly to L2 and L3
#       layer2          maximize L2 table size
#       layer3          maximize L3 table size
# example:
# OPTIONS="-l layer2"
OPTIONS=""

and adding -l <strategy> to OPTIONS.

To apply the new configuration, reboot the switch.

Resulting Table Sizes

Depending on the selected mode, the following number of entries will be evailable for tables 30 (Unicast Routing) and 50 (Bridging):

Platform default balanced layer2 layer 3
Celestica Questone 2 D3030 30: 32k
50: 32k
30: 160k
50: 160k
30: 32k
50: 288k
30: 288k
50: 32k
Delta AG5648 30: 48k
50: 40k
30: 80k
50: 72k
30: 16k
50: 136k
30: 144k
50: 16k
Delta AG7648 30: 32k
50: 32k
30: 160k
50: 160k
30: 32k
50: 288k
30: 224k
50: 96k
Edgecore AS4610 Series 30: 32k
50: 24k
30: 32k
50: 24k
30: 12k
50: 44k
30: 52k
50: 4k
Edgecore EPS202 (AS4630-54PE) 30: 24k
50: 32k
30: 72k
50: 64k
30: 24k
50: 112k
30: 120k
50: 16k
Edgecore DCS201 (AS5835-54X) 30: 32k
50: 32k
30: 160k
50: 160k
30: 32k
50: 288k
30: 288k
50: 32k
Edgecore DCS204 (AS7726-32X) 30: 32k
50: 32k
30: 160k
50: 160k
30: 32k
50: 288k
30: 288k
50: 32k

These values can be verified with

$ client_flowtable_dump -v 30
Table ID 30 (Unicast Routing):   Retrieving all entries. Max entries = 32768, Current entries = 0.
$ client_flowtable_dump -v 50
Table ID 50 (Bridging):   Retrieving all entries. Max entries = 294911, Current entries = 0.