A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Computing Power Saving Paths using TCAM Power Ratio
Author(s) : Shankar Raman
Balaji Venkat Venkataswami
Prof.Kamakoti Veezhinathan
Filename : draft-mjsraman-panet-tcam-power-ratio-02.txt
Pages : 10
Date : 2013-02-02
Abstract:
A power saving scheme for switching of TCAM banks of fine granularity
is discussed in [ID-TCAM-POWER-EFF]. This scheme switches of TCAM
banks of fine granularity and their corresponding SRAM banks
depending on the occupancy of routes and their rewrites within the
TCAM of a intelligent router line card (where one or more such TCAM
entities along with their SRAM banks may reside) by using an
algorithm specified in [ID-TCAM-POWER-EFF]. This takes care of
switching off TCAM and SRAM banks within a router's line card and
correspondingly saves power when the traffic matrix is not large with
respect to the routes the packets lookup where the occupancy of such
routes is low in the line card. This is with reference to both single
and multi-chassis devices. The algorithm specified therein tends to
switch off banks which are not in use. The aim of this draft is to
use the device level characteristic in the form of a TCAM Power Ratio
and disseminate it as a metric within an area or an Autonomous system
(where multiple such areas exist within an AS) to compute power
saving paths through the set of routers where the TCAM-POWER-RATIO is
low. The TCAM-POWER-RATIO is arrived at by dividing the number of
bits in the TCAM banks that are switched off by the Total Available
TCAM bank space in bits. This ratio is then subjected to the CSPF
algorithm as an additional constraint or the only constraint as the
case may be in a link state protocol like OSPF or IS-IS with Traffic
Engineering Extensions with available utilization on the links also
being a factor. This way those routers that have more TCAM banks
switched off are avoided and those with higher power consumption but
with available bandwidth are used hence not increasing the total
power consumed within the area and hence within the AS. This could be
achieved by using a PCE like entity that calculates the power
shortest paths using this TCAM-POWER-RATIO.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-mjsraman-panet-tcam-power-ratio
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-mjsraman-panet-tcam-power-ratio-02
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-mjsraman-panet-tcam-power-ratio-02
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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