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Catalyst 3560 Switch Software Configuration Guide
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Chapter 8 Configuring SDM Templates
Understanding the SDM Templates
The first eight rows in the tables (unicast MAC addresses through security ACEs) 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 row is a
guideline used to calculate hardware resource consumption related to the number of Layer 2 VLANs on
the switch.
Dual IPv4 and IPv6 SDM Templates
You can select SDM templates to support IP Version 6 (IPv6). For more information about IPv6 and how
to configure IPv6 routing, see Chapter 36, “Configuring IP Unicast Routing.”
This software release does not support Policy-Based Routing (PBR) when forwarding IPv6 traffic. The
software supports IPv4 PBR only when the dual-ipv4-and-ipv6 routing template is configured.
The dual IPv4 and IPv6 templates allow the switch to be used in dual stack environments (supporting
both IPv4 and IPv6). Using the dual stack templates results in less TCAM capacity allowed for each
resource. Do not use them if you plan to forward only IPv4 traffic.
These SDM templates support IPv4 and IPv6 environments:
Dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for
IPv4; and Layer 2, routing, and ACLs for IPv6 on the switch
Dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including policy-based
routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on the switch
Dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for IPv4,
and basic Layer 2 and ACLs for IPv6 on the switch
Note An IPv4 route requires only one TCAM entry. Because of the hardware compression scheme used for
IPv6, an IPv6 route can take more than one TCAM entry, reducing the number of entries forwarded in
hardware. For example, for IPv6 directly connected IP addresses, the desktop template might allow less
than two thousand entries.
Tabl e 8-2 defines the approximate feature resources allocated by each new template. Template
estimations are based on a switch with 8 routed interfaces and approximately 1000 VLANs.
Tab l e 8-1 Approximate Number of Feature Resources Allowed by Each Template
Resource Access Default Routing VLAN
Unicast MAC addresses 4 K 6 K 3 K 12 K
IGMP groups and multicast routes 1 K 1 K 1 K 1 K
Unicast routes 6 K 8 K 11 K 0
Directly connected hosts 4 K 6 K 3 K 0
Indirect routes 2 K 2 K 8 K 0
Policy-based routing ACEs 512 0512 0
QoS classification ACEs 512 512 512 512
Security ACEs 2 K 1 K 1 K 1 K
Layer 2 VLANs 1 K 1 K 1 K 1 K