Web Management Guide

Chapter 14 | IP Configuration
Setting the Switch’s IP Address (IP Version 6)
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◆ ICMPv6 – Internet Control Message Protocol for Version 6 addresses is a
network layer protocol that transmits message packets to report errors in
processing IPv6 packets. ICMP is therefore an integral part of the Internet
Protocol. ICMP messages may be used to report various situations, such as
when a datagram cannot reach its destination, when the gateway does not
have the buffering capacity to forward a datagram, and when the gateway can
direct the host to send traffic on a shorter route. ICMP is also used by routers to
feed back information about more suitable routes (that is, the next hop router)
to use for a specific destination.
◆ UDP – User Datagram Protocol provides a datagram mode of packet switched
communications. It uses IP as the underlying transport mechanism, providing
access to IP-like services. UDP packets are delivered just like IP packets –
connection-less datagrams that may be discarded before reaching their
targets. UDP is useful when TCP would be too complex, too slow, or just
unnecessary.
Parameters
These parameters are displayed:
Table 37: Show IPv6 Statistics - display description
Field Description
IPv6 Statistics
IPv6 Received
Total The total number of input datagrams received by the interface,
including those received in error.
Header Errors The number of input datagrams discarded due to errors in their IPv6
headers, including version number mismatch, other format errors, hop
count exceeded, IPv6 options, etc.
Too Big Errors The number of input datagrams that could not be forwarded because
their size exceeded the link MTU of outgoing interface.
No Routes The number of input datagrams discarded because no route could be
found to transmit them to their destination.
Address Errors The number of input datagrams discarded because the IPv6 address in
their IPv6 header's destination field was not a valid address to be
received at this entity. This count includes invalid addresses (e.g., ::0)
and unsupported addresses (e.g., addresses with unallocated prefixes).
For entities which are not IPv6 routers and therefore do not forward
datagrams, this counter includes datagrams discarded because the
destination address was not a local address.
Unknown Protocols The number of locally-addressed datagrams received successfully but
discarded because of an unknown or unsupported protocol. This
counter is incremented at the interface to which these datagrams were
addressed which might not be necessarily the input interface for some
of the datagrams.
Truncated Packets The number of input datagrams discarded because datagram frame
didn't carry enough data.
Discards The number of input IPv6 datagrams for which no problems were
encountered to prevent their continued processing, but which were
discarded (e.g., for lack of buffer space). Note that this counter does not
include any datagrams discarded while awaiting re-assembly.