Ipv6 Tunnel; Types Of Tunnels; Configuring Tunnels - Cisco SF500-24 Administration Manual

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IPv6 Tunnel

Tunnels enable transmission of IPv6 packets over IPv4 networks. Each tunnel has a
source IPv4 address and a destination IPv4 address. The IPv6 packet is
encapsulated between these addresses.
ISATAP tunnels can only be activated on the device when IPv6 routing is not
enabled, and only the ipv6 management interface can be tunneled.

Types of Tunnels

Two types of tunnels can be configured on the device, as follows:
• ISATAP Tunnel
The Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) is a point-to-
multi-point tunnel. The source address is the IPv4 address (or one of the
IPv4 addresses) of the device.
When configuring an ISATAP tunnel, the destination IPv4 address is
provided by the router. Note that:
- An IPv6 link local address is assigned to the ISATAP interface. The initial
IP address is assigned to the interface, which is then activated.
- If an ISATAP interface is active, the ISATAP router IPv4 address is
resolved via DNS by using ISATAP-to-IPv4 mapping. If the ISATAP DNS
record is not resolved, ISATAP host name-to-address mapping is
searched in the host mapping table.
- When the ISATAP router IPv4 address is not resolved via the DNS
process, the ISATAP IP interface remains active. The system does not
have a default router for ISATAP traffic until the DNS process is resolved.
• Manual Tunnel
This is a point-to-point definition. When creating a manual tunnel, you enter
both the source IP address (one of the device's IP addresses) and the
destination IPv4 address.
Up to 16 tunnels (of which one can be ISATAP) can be defined.

Configuring Tunnels

To configure a tunnel, first configure an IPv6 interface as a tunnel in the IPv6
Interfaces page.
To configure an IPv6 tunnel:
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3
IP Configuration
IPv6 Management and Interfaces