[c-nsp] OT - Cisco QoS - FIFO

[Mack McBride]

Not really off topic.
Very relevant to cisco performance.
Generally control traffic winds up in a different queue if QoS is used.
By default on the 6500 with a 6708 line card for example:
Queue 3 handles COS 6 & 7 traffic.
Queue 3 gets 15% of the buffers

Cisco also implements a feature called SPD Headroom and SPD extended Headroom.
BGP traffic winds up in headroom and IGP traffic in extended headroom.
This is probably more like what your friend is referring to.

https://www9.cisco.com/en/US/products/hw/routers/ps167/products_tech_note09186a008012fb87.shtml


Mack McBride
Network Architect


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Christopher O'Shea
Sent: Wednesday, June 16, 2010 10:21 PM
To: Cisco certification; cisco-nsp at puck.nether.net
Subject: [c-nsp] OT - Cisco QoS - FIFO

Had a question about QoS with a co-worker asking does Cisco devices
give priority to Network Control (CS6) traffic traffic?
He show/told me that in Juniper that always have 5% for Network
control traffic even on FIFO

Chris O'Shea
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