IP Configuration
IPv6 Management and Interfaces
Cisco 500 Series Managed Switch Administration Guide 382
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IPv6 Multicast is not supported on the 6to4 tunnel interface.
The switch automatically creates a 2002::/16 on-link prefix on the 6to4
tunnel. The connected 2002::/16 route on the tunnel is added to the Routing
Table as result of the on-link prefix creation.
When the tunnel mode is changed from 6to4 to another mode, the on-link
prefix and connected routes are removed.
When the next hop outgoing interface is the 6to4 tunnel, the IPv4 address of
the next hop node is taken from the prefix 2002:WWXX:YYZZ::/48 of the
IPv6 next hop IPv6 address, if it is global, and from the last 32 bits of the
interface identifier of the IPv6 next hop IPv6 address, if it is link local.
Up to 16 tunnels (of which one can be ISATAP) can be defined.
Configuring Tunnels
NOTE After configuring a tunnel, configure IPv6 interface in the IPv6 Interfaces page.
To configure an IPv6 tunnel:
STEP 1 In Layer 2 system mode, click Administration > Management Interface > IPv6
Tunnel.
Layer 2 mode is only available on Sx500 devices and on SG500X devices when
they are in Hybrid stack mode.
STEP 2 In Layer 3 system mode, click IP Configuration > IPv6 Management and
Interfaces > IPv6 Tunnel.
STEP 3 Enter the ISATAP Parameters.
• Solicitation Interval—The number of seconds between ISATAP router
solicitations messages, when no active ISATAP router is discovered. The
interval can be the default value or a user-defined interval.
• Robustness—Used to calculate the interval for router solicitation queries.
The bigger the number, the more frequent the queries.
NOTE The ISATAP tunnel is not operational if the underlying IPv4 interface is
not in operation.
STEP 4 Click Apply to save the ISATAP parameters to the Running Configuration file.
STEP 5 To add a tunnel, select an interface (which was defined as a tunnel in the IPv6
Interfaces page) in the IPv6 Tunnel Table and click Add.
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