[nsp] RPF on Catalyst 6k

[Rubens Kuhl Jr.]

Because of performance on a wire-speed device, all checkings must be done in
parallel. If the CEF table were stored at only one place, it would require 2
lookups to fetch the destination and verify RPF. As far as I know, it's an
identical copy.


Rubens Kuhl Jr.



----- Original Message -----
From: "efrat and uri" <efrat_uri@hotmail.com>
To: <cisco-nsp@puck.nether.net>
Sent: Wednesday, December 25, 2002 6:47 AM
Subject: [nsp] RPF on Catalyst 6k


| Hi,
| As I understand form Cisco doc. The 6K can hold 256K entries of IPv4 CIDR
in
| 2 TCAM. This is the CEF.
| How much does a CIDR entry takes? one TCAM row - 64 bits /32 bits
|
| If the RPF is enabled the capacity is reduced by half.
| Do you know why?
| Does the CEF structure actually changes?
| Is it because of performance?