Cisco Catalyst X4232 Installation And Configuration Note page 75

TCAM space consists of 32K entries, and each entry is 32 bits wide. Because SDM is responsible for
managing TCAM space, SDM partitions the TCAM space for each protocol region based on user
configuration. Although the maximum size of all protocol regions is fixed, you can reconfigure the size
of each protocol region. A change in the partition configuration takes effect only after the next system
reboot.
Table 14 lists default partitioning for each protocol region in TCAM.
Table 14
Protocol Region
ip-adjacency
ipx-node
ip-prefix
ipx-network
ip-mcast
MAC-address
access-list
UDP-flooding
IPX Direct
Configuring SDM
This section describes how to configure SDM. This section includes the commands required to
configure the autolearn feature in SDM and the commands required to configure the size of the SDM
regions. The commands described in this section are unique to Layer 3 switching software.
Configuring SDM Regions
The protocol region size in SDM is represented by the number of 32-bit or 64-bit entries. The combined
size of all the application regions should be calculated in terms of 32-bit TCAM entries and should not
exceed 32K, which is the total TCAM size.
Although the size of the whole protocol region is configured by default, you can
Note
reconfigure it. The reconfigured size of the protocol region is effective only after the next
system reboot.
To configure the SDM size for each protocol region, perform the following tasks in global configuration
mode:
Task
Step 1 Set the name of the protocol region whose size you want to
configure. You can enter the size as an absolute number of
entries or as multiples of 1K (that is, 1024) entries.
Step 2 Return to privileged EXEC mode.
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Default Partitioning per TCAM Protocol Region
Lookup Type Key Size
Exact-match 32 bits
Exact-match 64 bits
Longest-match 32 bits
Exact-match 32 bits
Longest-match 64 bits
Exact-match 64 bits
First-match 128 bits
Exact-match 64 bits
Exact-match 32 bits
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
Configuring the Switching Database Manager
Default Size
2048
2048
8192
4096
3072
1024
1024
256
224
Command
Router (config-if) # sdm size
region-name {num-entries |
k-entries num-k-entries}
Router (config-if) # Ctrl-Z
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