User's Manual

SPEEDLAN Installation and Operation User Guide
SNMP Monitoring 11-19
• Unknown routes
The number of IP datagrams discarded because no route could be found to transmit them
to their destination. Note that this counter includes any packets counted in Datagrams
forwarded which meet this `no-route'criterion, as well as any datagrams which a host
cannot route because all of its default gateways are down.
• Reassembly timeout
The maximum number of seconds that received fragments are held while they are awaiting
reassembly at this entity.
• Reassembly fragments
The number of IP datagrams received which needed to be reassembled at this entity.
• Good Reassemblies
The number of IP datagrams successfully reassembled.
• Failed Reassemblies
The number of failures detected by the IP reassembly algorithm (for whatever reason - timed
out, errors, etc.). Note that this is not necessarily a count of discarded IP fragments since
some algorithms (notably the algorithm in RFC 815) can lose track of the number of
fragments by combining them as they are received.
• Datagrams fragmented
The number of IP datagrams that have been successfully fragmented at this entity.
• Fragment failures
The number of IP-datagram fragments that have been discarded because they needed to be
fragmented at this entity but could not be because the datagram's "don't fragment" flag was
set.
• Fragments created
The number of IP-datagram fragments that have been generated as a result of
fragmentation at this entity.
• Datagrams forwarded
The number of input datagrams for which this entity was not their final IP destination, as a
result of which an attempt was made to find a route to forward them to that final
destination. In entities which do not act as IP gateways, this counter will include only those
packets which were Source-Routed via this entity, and for which Source-Route option
processing was successful.
• Routing discards
The number of routing entries which were chosen to be discarded even though they were
valid. One possible reason for discarding such an entry could be to free up buffer space for
other routing.