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39-14
Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 39 Configuring IPv6 Host Functions and Unicast Routing
Understanding IPv6
If you try to configure IPv6 without first selecting a dual IPv4 and IPv6 template, a warning message
appears.
Note Using the dual stack templates allows less hardware memory capacity for each resource, so do not use
if you plan to forward only IPv4 traffic.
Dual IPv4-and IPv6 SDM Templates
These SDM templates support IPv4 and IPv6 environments:
Note IPv6 Multicast Listener Discovery (MLD) snooping is supported, but IPv6 multicast routing or QoS is
not supported.
• 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 hardware entry. Because of the hardware compression scheme used for
IPv6, an IPv6 route can take more than one hardware 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.
Table 39-5 defines the approximate feature resources allocated by each new template. Template
estimations are based on a switch with eight routed interfaces and approximately one thousand VLANs.
Table 39-5 Approximate Feature Resources Allowed by Dual IPv4-IPv6 Templates
Resource
IPv4-and-IPv6
Default
IPv4-and-IPv6
Routing
IPv4-and-IPv6
VLAN
Unicast MAC addresses 2 K 1.5 K 8 K
IPv4 IGMP groups and multicast routes 1 K 1 K 1 K for IGMP
groups
0 for multicast
routes
Total IPv4 unicast routes: 3 K 2.75 K 0
• Directly connected IPv4 hosts 2 K 1.5 K 0
• Indirect IPv4 routes 1 K 1.25 K 0
IPv6 multicast groups 1 K 1 K 1 K
Directly connected IPv6 addresses 2 K 1.5 K 0
Indirect IPv6 unicast routes 1 K 1.25 K 0
IPv4 policy-based routing ACEs
1
00.25 K0