[c-nsp] L2TPv3 process switched?

[Bruce Robertson]

I'm looking for some help with L2TPv3.  I can't seem to figure out how to get 
it to not be process switched, but I also can't find any references anywhere 
saying that it isn't CEF switched.  Here's my basic problem:

CPU utilization for five seconds: 72%/38%; one minute: 72%; five minutes: 73%
  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
   56    80450508  24141894       3332 33.07% 33.56% 34.39%   0 IP Input


My environment consists of a 3662 at one end of the tunnel, and a 3640 at the 
other.  (I know, part of my problem may be that L2TPv3 isn't officially 
supported on this platform.)  Both routers are running 12.4(8).

Here's my config on the 3662:

pseudowire-class tunnel-to-3640
  encapsulation l2tpv3
  ip local interface Loopback0
  ip tos reflect
interface FastEthernet2/0
  no ip address
  no ip redirects
  no ip proxy-arp
  load-interval 30
  speed 100
  full-duplex
  keepalive 1
  no cdp enable
  xconnect <ip-addy-of-3640-fe0/0> 1 pw-class tunnel-to-3640

And of course, the config on the 3640 is similar:

pseudowire-class tunnel-to-3662
  encapsulation l2tpv3
  ip local interface FastEthernet0/0     [this is on purpose - no loopback on 
this router, for a fairly good reason]
  ip tos reflect
interface FastEthernet0/1
  description Idacomm
  no ip address
  no ip redirects
  no ip proxy-arp
  load-interval 30
  duplex auto
  speed auto
  no cdp enable
  xconnect <ip-addy-of-3662-loop0> 1 pw-class tunnel-to-3662