Avaya P580 - Manual (Page 236)

6-6 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1
Chapter
This exceeds the 20K guideline for the amount of AFT memory used
for Hash Tables. Even if the Hash Table size is reduced by half, it still
exceed the guideline. In order to comply with the guideline, the
Initial Hash Table Size for each VLAN should be 256 or less. 45
VLANs times 256 = 11,520 or ~ 12K This leaves 48K for AFT entries
(60K - 12K = 48K).
Example 2
VLANs have the different Hash Table Sizes
Configuring the Avaya Multiservice switch for 6 “large” VLANs
(4000 users on each), 30 “medium” VLANs (1000 users on each),
and 50 “small” VLANs (200 users on each). Using the “Hash Table
Guidelines”, each “large” VLAN should have a hash table size
around (1/4)*4000=1000, each “medium” VLAN around (1/
4)*1000=250, and each “small” VLAN should have a hash table size
around (1/4)*200=50. We also want to make sure that the total
amount of memory used for the Hash Tables is less then 20k, which
it will be (~17K).
6 VLANs times 1024 = 6,144
30 VLANs times 256 = 7,680
50 VLANs times 64 = 3,200
Total AFT Memory used or Hash Tables = 17,024 or ~ 17K
This meets the guideline.