From: Jeff Olson (jolson@xxxxxxxxx)
Date: Wed Nov 07 2001 - 13:10:59 GMT-3
All packets in the high queue will be processed first, regardless of the
other queues. If the high queue is never empty, the other queues will
never be serviced. This is the same for the other queues as well.
Snipped from Cisco
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/q
os_c/qcpart2/qcconman.htm
------------------
Why Use Priority Queueing?
Priority Queueing provides absolute preferential treatment to high
priority traffic, ensuring that mission-critical traffic traversing
various WAN links gets priority treatment. In addition, Priority
Queueing provides a faster response time than do other methods of
queueing.
Although you can enable priority output queueing for any interface, it
is best used for low-bandwidth, congested serial interfaces.
Considerations
When choosing to use Priority Queueing, consider that because lower
priority traffic is often denied bandwidth in favor of higher priority
traffic, use of Priority Queueing could, in the worst case, result in
lower priority traffic never being transmitted. To avoid inflicting
these conditions on lower priority traffic, you can use traffic shaping
or CAR to rate-limit the higher priority traffic.
Priority Queueing introduces extra overhead that is acceptable for slow
interfaces, but may not be acceptable for higher speed interfaces such
as Ethernet. With Priority Queueing enabled, the system takes longer to
switch packets because the packets are classified by the processor card.
Priority Queueing uses a static configuration and does not adapt to
changing network conditions.
Restrictions
Priority Queueing is not supported on any tunnels.
Jeff Olson
-----Original Message-----
From: Shane Miles [mailto:smiles@ftdata.com]
Sent: Wednesday, November 07, 2001 9:50 AM
To: 'ccielab@groupstudy.com'
Subject: priority queuing
If I create a priority-list lets say for example all IP in the
high
and everything else in the medium. Within a single queue, lets say the
high
queue, is that traffic FIFO? Thanks.
-- Shane P. Miles
This archive was generated by hypermail 2.1.4 : Fri Jun 21 2002 - 06:45:07 GMT-3