Viewing TCAM Utilization

The switch architecture uses a TCAM (Ternary Content Addressable Memory) to support an extensive data search in a short period of time.

TCAM holds the rules produced by other applications, such as ACLs (Access Control Lists) or QoS.

The maximum number of TCAM rules that can be allocated by all applications on the device is 512.

Some applications allocate rules upon their initiation. Additionally, processes that initialize during system boot use some of their rules during the startup process.

To view TCAM utilization, click Status and Statistics > TCAM Utilization. The TCAM Utilization page opens, displaying the percentage of TCAM utilization in the system and the maximum TCAM entries.

TCAM Rules

The TCAM Rules Per Process table lists all processes that can allocate TCAM rules. Each process has its specific allocation policy.

TCAM Rules Per Process  

Process

Per Port/
Per Switch

Allocation on Activation

Process Upper Limit

TCAM Rules Used Up Per User Entry

Comments

QoS Advanced Mode Rules

Port

6/device

No limit

1 or 2 TCAM entries per rule.

 

Access Control Rules

Port

6/device

No limit

1 or 2 TCAM entries per rule.

 

MAC Based VLAN

Port

0

No limit

No limit

Rules are duplicated for MAC-based VLANs (two rules per VLAN).

VLAN Rate Limiting

Both

0

255

1 Global rule per VLAN Rate Limit.

An additional rule is created for each Permit rule on the interface.