Dual Ipv4 And Ipv6 Protocol Stacks; Snmp And Syslog Over Ipv6 - Cisco WS-C3020 Software Configuration Manual

Understanding IPv6
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Dual IPv4 and IPv6 Protocol Stacks

One technique for transitioning to IPv6 is by using dual IPv4 and IPv6 protocol stacks. Using dual stacks
enables gradual, one-by-one upgrades to applications running on nodes. Applications that are upgraded
to IPv6 use the IPv6 protocol stack, and applications that are not upgraded and support only IPv4 can
coexist with upgraded applications on the same node. New and upgraded applications can use both IPv4
and IPv6 protocol stacks.
The Cisco IOS software supports the dual IPv4 and IPv6 protocol stack technique. When both IPv4 and
IPv6 routing are enabled and an interface is configured with both an IPv4 and IPv6 address, the interface
forwards both IPv4 and IPv6 traffic.
Figure 35-1 shows a router forwarding both IPv4 and IPv6 traffic through the same interface, based on
the IP packet and destination addresses.
Figure 35-1
The switch uses ternary content addressable memory (TCAM) to store unicast routes, MAC addresses,
access control lists (ACLs), and other features, and provides the switch database management (SDM)
templates to allocate memory resources depending on how the switch is used. You must use the dual IPv4
and IPv6 template templates to allocate TCAM usage to both IPv4and IPv6 protocols. See the
IPv4 and IPv6 SDM Templates" section on page

SNMP and Syslog Over IPv6

Simple Network and Management Protocol (SNMP) can be configured over IPv6 transport so that an
IPv6 host can send SNMP queries and receive SNMP notifications from a device running IPv6.
SNMP and syslog over IPv6 provides these features:
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To provide support over IPv6, SNMP modifies existing IP transport mapping to support IPv4 and IPv6
simultaneously. To provide support for IPv6 transport mapping, SNMP provides these features:
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
35-10
Dual IPv4 and IPv6 Support on an Interface
Supports both IPv4 and IPv6
Defines IPv6 transport for SNMP and modify the SNMP agent to support traps for an IPv6 host
Enhances related MIBs to support IPv6 addressing scheme: modifies SNMP infra-MIBs that have
IPv4 addresses so that they work with IPv6 addresses
Configures IPv6 hosts as trap receiver
IPv4
10.1.1.1
IPv6
3ffe:yyyy::1
35-12.
Chapter 35 Configuring IPv6 Host Functions
"Dual
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