Managing Address Forwarding Tables (Layer 2 & Layer 3)
Cajun P550/P220 Switch Operation Guide
14
-
3
4.
From the
Hash Table/Size
pull-down menu, select the
new size
to alter the space
available for this address table. 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 that 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.
5.
From the
Hash Table/Auto Increment
pull-down menu, select
False
to prevent
the table size from reconfiguring automatically.
6.
Click
APPLY
to save your changes, or
CANCEL
to restore previous settings.
If you want to relearn the entire table, click
Delete All Learned Entries
.
If you want to delete all entries that are currently aged out, click
Delete All
Invalid Learned Entries
.
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.
Entry Validity
Displays the entry validity for this VLAN.
Options include:
•
Valid
- Entry exists.
•
Invalid
- Entry has aged out but still exists even
though the port binding is invalid.
Hash Table
Displays the hash table parameters.
Options include:
•
Size
- It is recommended that the hash table size be
1/8th the size of the total number of addresses for the
VLAN.
•
Auto Increment
- Hash tables may grow dynamically
larger if more addresses are discovered. Disabling
auto-increment prevents these 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 14-1.
Address Table Instance Parameters (Continued)
Parameter
Definition
Содержание Cajun P220
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