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Cajun P550/P880/P882 Switch User Guide
Managing the Address Forwarding Table
6-7
5. Click:
■ APPLY to save your changes
■ CANCEL to restore previous settings
■ Delete All Learned Entries if you want to relearn the entire
table
■ Delete Invalid Learned Entries if you want to delete all
entries that are currently aged out.
* Note: If you change the Hash Table Size, the switch relearns all
addresses in that table, causing the switch to flood
packets for a few seconds.
Hash Table Select one of the following hash table parameters:
Note: Size - Select the size to alter the space available for this
address table. The selection range is 16 addresses to 8192
addresses. The rule of thumb is: Tables with high Total
Bucket Utilization (greater than 75%) can be made
smaller. Tables with low Total Bucket Utilization (less
than 40%) should be made larger. Note: The number
of addresses for a given hash table is 4:1 (for example, if
you have a hash table of 16 bytes, the VLAN can hold 64
addresses in it’s table instance. It is recommended that
the hash table size be 1/8th the size of the total number
of addresses for the VLAN.
• Auto Increment - Select an option to allow the Hash
tables to grow dynamically larger if more addresses are
discovered. The options are:
True _ Enables auto-increment of the Hash tables.
False - Disables auto-increment to prevent the Hash tables
from growing dynamically at the risk of extra flooding.
Bucket Info Displays parameters to monitor the efficiency of the hash table
allocations.
Options include:
• Count - Indicates the hash table count.
• Capacity - Indicates the hash table capacity.
• Utilization - High utilization indicates that a larger hash
table is needed.
Table 6-1. Address Table Instance Parameters continued
Parameter Definition