[c-nsp] Why is CEF disabled on dynamic interfaces?

[Stephen Stuart]

> We have a 7206 non-VXR with an NPE-150 running IOS 12.2(15)T15.  As
> previously discussed on this list, we can't upgrade it past 12.2T since
> 12.3 and onwards don't support the NPE-150 anymore.
> 
> [...]
> 
> Apparently this problem doesn't happen in 12.3T.  Any ideas for
> workarounds, other than biting the bullet and upgrading the router
> hardware so we can use a later IOS?

I have a 7206 with NPE-150 running 12.3(7)T. Later 12.3T
builds don't run because support for NPE-150 was removed, but you
might have luck with this one:

Cisco IOS Software, 7200 Software (C7200-JK9S-M), Version 12.3(7)T, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Sat 21-Feb-04 02:40 by eaarmas

ROM: System Bootstrap, Version 11.1(10) [dschwart 10], RELEASE SOFTWARE (fc1)
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(21)S7, EARLY
DEPLOYMENT RELEASE SOFTWARE (fc2)

router uptime is 2 days, 2 hours, 0 minutes
System returned to ROM by power-on
System restarted at 14:50:53 UTC Wed Jun 22 2005
System image file is "disk0:c7200-jk9s-mz.123-7.T.bin"

[...]

Cisco 7206 (NPE150) processor (revision B) with 114688K/16384K bytes of memory.
Processor board ID 8085625
R4700 CPU at 150MHz, Implementation 33, Rev 1.0, 512KB L2 Cache
6 slot midplane, Version 1.3

Stephen