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Q
Q-in-Q — See 802.1ad.
QoS — Quality of service. Performance, such as transmission rates
and error rates, of a communications channel or system.
quad-wide — Type of PIC that combines the PIC and FPC within a single FPC
slot.
qualified next hop — Next hop for a static route that allows a second next hop for
the same static route to have different metric and preference properties
from the original next hop.
quality of service — See QoS.
querier router — PIM router on a broadcast subnet responsible for generating
IGMP query messages for the segment.
queue — First-in, first-out (FIFO) number of packets waiting to be forwarded
over a router interface. You can configure the minimum and maximum
size of the packet queue, queue admission policies, and other parameters
to manage the flow of packets through the router.
queue fullness — For random early discard (RED), the memory used to store packets
expressed as a percentage of the total memory allocated for that specific
queue. See also drop profile.
queue length — For ATM1 interfaces only, a limit on the number of transmit
packets that can be queued. Packets that exceed the limit are dropped. See also EPD.
queuing — In routing, the arrangement of packets waiting to be forwarded.
Packets are organized into queues according to their priority, time
of arrival, or other characteristics, and are processed one at a time.
After a packet is sent to the outgoing interface on a router, it is
queued for transmission on the physical media. The amount of time
a packet is queued on the router is determined by the availability
of the outgoing physical media, bandwidth, and the amount of traffic
using the interface.
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