[c-nsp] 7600 SUP720-3B PBR

[Aaron]

I found this, although it might be redundant to what others have already
sent you...
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Policy-Based Routing TCAM and Adjacency Utilization 
In Supervisor 2 with PFC2 and Supervisor 720 with PFC3, policy-based routing
(PBR) is fully supported in hardware using a combination of the security and
feature ACL TCAM and the hardware adjacency table. 

While a discussion of PBR is outside the scope of this document, it is
important to understand that PBR does consume ACL TCAM resources and
adjacency table entries. 

When you configure PBR, the PBR ACLs are installed in the security ACL TCAM.
When a packet matches a PBR ACE, an adjacency pointer is returned as the
result. The pointer references a location in the hardware adjacency table
that contains the rewrite information necessary to forward the packet to the
correct PBR next hop. 

In Supervisor 2 with PFC2, 1024 of the 256 K available hardware adjacencies
are reserved for PBR. In Supervisor 720 with PFC3, 2048 of the 1 million
available hardware adjacencies are reserved for PBR. 

http://www.cisco.com/en/US/products/hw/switches/ps708/products_white_paper09
186a00800c9470.shtml
***************************************************************

Aaron


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of harbor235
Sent: Tuesday, September 18, 2012 11:57 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] 7600 SUP720-3B PBR

My google fu has not turned up anything definitive on the 7600 PBR
performance, is it done in hardware or is it down in software? With or
without DFCs. Can anyone provide any insight into sup720 PBR performance?

My feeling is if we enable PBR it may negatively impact the box, assume PBR
related bandwidth to exceed 100M


thanks in advance,


Mike
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