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 available 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.