6-2
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 6 Configuring SDM Templates
Understanding the SDM Templates
Table 6-1 shows the approximate number of each resource supported in each of the two IPv4 templates
for a switch running the metro IP access image. The values in the template are based on eight routed
interfaces and approximately 1024 VLANs and represent the 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.
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 IPv6 Unicast Routing.” For information about
configuring IPv6 ACLs, see Chapter 37, “Configuring IPv6 ACLs.”
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
This software release does not support IPv6 multicast routing, IPv6 QoS, or IPv6 Multicast Listener
Discovery (MLD) snooping.
Ta b l e 6-1 Approximate Number of Feature Resources Allowed by Each Template
Resource Layer-2 Default
Unicast MAC addresses 8 K 5 K
IPv4 IGMP groups + multicast routes (default only) – 1 K
IP v4 IGMP groups (layer-2 only) 1 K –
IPv4 multicast routes (layer-2 only) 0 –
IPv4 IGMP groups and multicast routes 1 K –
IPv4 unicast routes 0 9 K
• Directly connected IPv4 hosts – 5 K
• Indirect IPv4 routes – 4 K
IPv4 policy-based routing ACEs
1
1. ACEs = Access control entries.
0 0.5 K
IPv4 or MAC QoS
2
ACEs
2. QoS = Quality of service.
0.5 K 0.5 K
IPv4 or MAC security ACEs 1 K 1 K
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