IP Configuration
IPv6 Management and Interfaces
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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Tunneling uses either an ISATAP or manual mechanism (see
IPv6 Tunnel
). Tunneling treats
the IPv4 network as a virtual IPv6 local link, with mappings from each IPv4 address to a link
local IPv6 address.
The device detects IPv6 frames by the IPv6 Ethertype.
In the same way as occurs in IPv4 routing, frames addressed to the devices's MAC address, but
to an IPv6 address that is not known to the device, are forwarded to a next-hop device. This
device may be the target end-station, or a router nearer the destination. The forwarding
mechanism entails re-building a L2 frame around the (essentially) unchanged L3 packet
received, with the next-hop device’s MAC address as the destination MAC address.
The system uses Static Routing and Neighbor Discovery messages (similar to IPv4 ARP
messages) to build the appropriate forwarding tables and next-hop addresses.
A route defines the path between two network devices. Routing entries added by the user are
static, and are used by the system until explicitly removed by the user. They are not changed
by routing protocols. When static routes must be updated, this must be done explicitly by the
user. It is the user's responsibility to prevent routing loops in the network.
Static IPv6 routes are either:
•
Directly-attached, meaning that the destination is directly-attached to an interface on
the device, so that the packet destination (which is the interface) is used as the next-
hop address.
•
Recursive, where only the next-hop is specified, and the outgoing interface is derived
from the next-hop.
In the same manner, the MAC address of the next-hop devices (including directly-attached
end-systems) are automatically derived using Network Discovery. However, the user may
override and supplement this by adding manually entries to the Neighbors table.
IPv6 Global Configuration
To define IPv6 global parameters and DHCPv6 client settings:
STEP 1
Click
IP Configuration
>
IPv6 Management and Interfaces
>
IPv6 Global Configuration
.
STEP 2
Enter values for the following fields:
•
IPv6 Routing
—Select to enable IPv6 routing. If this is not enabled, the device acts as
a host (not a router) and can receive management packets, but cannot forward packets.
If routing is enabled, the device can forward the IPv6 packets.
