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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 6 Administering the Switch
Optimizing System Resources for User-Selected Features
Displaying Address Table Entries
You can display the MAC address table by using one or more of the privileged EXEC commands
described in
Table 6-5
:
Optimizing System Resources for User-Selected Features
By using Switch Database Management (SDM) templates, you can configure memory resources in the
switch to optimize support for specific features, depending on how the switch is used in your network.
You can select one of four templates to specify how system resources are allocated. You can then
approximate the maximum number of unicast MAC addresses, Internet Group Management Protocol
(IGMP) groups, quality of service (QoS) access control entries (ACEs), security ACEs, unicast routes,
multicast routes, subnet VLANs (routed interfaces), and Layer 2 VLANs that can be configured on the
switch.
The four templates prioritize system memory to optimize support for these types of features:
•
QoS and security ACEs—The access template might typically be used in an access switch at the
network edge where the route table sizes might not be substantial. Filtering and QoS might be more
important because an access switch is the entry to the whole network.
•
Routing—The routing template maximizes system resources for unicast routing, typically required
for a router or aggregator in the center of a network.
•
VLANs—The VLAN template disables routing and supports the maximum number of unicast MAC
addresses. It would typically be selected for a Catalyst 3550 used as a Layer 2 switch.
•
Default—The default template gives balance to all functionalities (QoS, ACLs, unicast routing,
multicast routing, VLANs and MAC addresses).
Table 6-6
lists the approximate number of each resource supported in each of the four templates for
Catalyst 3550 Gigabit Ethernet switches.
Table 6-7
compares the four templates for a Catalyst 3550
switch with primarily Fast Ethernet ports.
The first six rows in the tables (unicast MAC addresses through multicast routes) represent approximate
hardware boundaries set when a template is selected. If a section of a hardware resource is full, all
processing overflow is sent to the CPU, seriously impacting switch performance.
The last two rows, the total number of routed ports and SVIs and the number of Layer 2 VLANs, are
guidelines used to calculate hardware resource consumption related to the other resource parameters.
Table 6-5
Commands for Displaying the MAC Address Table
Command
Description
show mac-address-table address
Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time
Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count
Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic
Displays dynamic MAC address table entries only.
show mac-address-table interface
Displays the MAC address table information for the specified interface.
show mac-address-table multicast
Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table static
Displays static MAC address table entries only.
show mac-address-table vlan
Displays the MAC address table information for the specified VLAN.
