B
ASIC
M
ANAGEMENT
T
ASKS
4-16
• IPv6 MTU – Sets the size of the maximum transmission unit (MTU) for
IPv6 packets sent on an interface. (Range: 1280-65535 bytes,
Default: 1500 bytes)
- If a non-default value is configured, an MTU option is included in the
router advertisements sent from this device. This option is provided
to ensure that all nodes on a link use the same MTU value in cases
where the link MTU is not otherwise well known.
- IPv6 routers do not fragment IPv6 packets forwarded from other
routers. However, traffic originating from an end-station connected
to an IPv6 router may be fragmented.
- All devices on the same physical medium must use the same MTU in
order to operate correctly.
- IPv6 must be enabled on an interface before the MTU can be set.
IP Address
• Auto Configuration – Enables stateless autoconfiguration of IPv6
addresses on an interface and enables IPv6 functionality on the interface.
The network portion of the address is based on prefixes received in IPv6
router advertisement messages, and the host portion is automatically
generated using the modified EUI-64 form of the interface identifier (i.e.,
the switch’s MAC address).
- If the router advertisements have the “other stateful configuration”
flag set, the switch will attempt to acquire other non-address
configuration information (such as a default gateway) from a DHCP
for IPv6 server.
• Manual Configuration – Manually configures an IPv6 address.
• IPv6 Address – An IPv6 address can be configured in any of these
ways:
- A link-local address can be manually configured by specifying the
entire address in the IPv6 Address field, and selecting the Address
Type “Link Local.” The network prefix length is fixed at 64 bits and
cannot be changed.
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