
Managing Device Information
TCAM Utilization
Cisco Small Business SFE/SGE Managed Switches Administration Guide
31
2
TCAM Allocation
Application
Per
Port/
Per
Device
Allocation
on
Activation
Application
Upper Limit
TCAM rules per User ACL
Comments
QoS
Advanced
Mode rules
Port
6/device
No limit
1 or 2 TCAM entries per each rule.
Feature is activated
by default.
Access
Control
Rules
Port
6/device
No limit
1 or 2 TCAM entries per each rule.
Feature is activated
by default.
PVE
Port
2/port or
LAG
---
---
Feature is activated
by default.
Allocation done only
during initialization.
IP Subnet
VLAN
Port
0
255
2 or 4
Rules are duplicated
for both IP and MAC
based VLANs.
Protocol
Based VLAN
Port
0
No limit
1 or 2
Rules are duplicated
for both IP and MAC
based VLANs.
MAC Based
VLAN
Port
0
432
1 or 2
Rules are duplicated
for both IP and MAC
based VLANs.
DHCP
Snooping
Device
2/device
No limit
8 TCAM entries/1 DHCP Snooping rule
IP Source
Guard
Port
0
No limit
1 TCAM entry/1 IP Source Guard entry
ARP
Inspection
Device
2/device
128
4 TCAM entries/1 ARP Inspection rule
VLAN Rate
Limiting
Both
0
255
1 global rule/1 VLAN Rate Limit.
Additional rule is created for each
“permit” rule on the interface.