6to4 relay on IOS <-> CEF switching?

[Dale W. Carder]

On Oct 9, 2008, at 9:58 AM, Gert Doering wrote:
> On Thu, Oct 09, 2008 at 09:54:18AM -0500, Dale W. Carder wrote:
>> We've been running a dedicated 6to4 relay w/ 12.4(19a) on a 7301
>> for about 4 months.
>
> Out of interest: what traffic levels are you observing?

Abysmally nothing.  Maybe a megabit or two max.

>  How much CPU
> load?  Does "show int <tunnel> stat" show processor-switched packets,
> or is it all properly CEF switched?


Looks like there is some process switching.  If I have things
configured wrong (config attached below), I'd like to get it fixed.


r-cssc-b217-3-lab#show int switching
GigabitEthernet0/0
     Protocol  IP
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                  Process   22729767 4711885253    3362173  679592609
             Cache misses        482          -          -          -
                     Fast       1346     124673   10148597 3016175956
                Auton/SSE          0          0          0          0
     Protocol  IPv6
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                  Process    1627198  194659225   18693462 3355364255
             Cache misses          0          -          -          -
                     Fast   10169298 2844834384          0          0
                Auton/SSE          0          0          0          0


Loopback0
     Protocol  IP
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                  Process          4        400          0          0
             Cache misses          0          -          -          -
                     Fast          0          0          0          0
                Auton/SSE          0          0          0          0

     Protocol  IPv6
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                  Process          8        608          8        608
             Cache misses          0          -          -          -
                     Fast          0          0          0          0
                Auton/SSE          0          0          0          0


Tunnel2002 6to4 relay service
     Protocol  IPv6
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                  Process   17144451 3283090356      75824    7405613
             Cache misses          0          -          -          -
                     Fast          0          0   10148348 2874053002
                Auton/SSE          0          0          0          0




ipv6 unicast-routing
ipv6 cef
!
interface Loopback0
  ip address 192.88.99.1 255.255.255.255 secondary
  ip address 10.151.163.35 255.255.255.255
  ipv6 address 2607:F388:0:100::7/128
  ipv6 enable
  ipv6 ospf 1 area 0
!
interface Tunnel2002
  description 6to4 relay service
  no ip address
  no ip redirects
  ipv6 address 2002:C058:6301::/128
  tunnel source Loopback0
  tunnel mode ipv6ip 6to4
!
interface GigabitEthernet0/0
  ip address 10.151.177.94 255.255.255.252
  duplex auto
  speed auto
  media-type rj45
  no negotiation auto
  ipv6 address 2607:F388:0:20E::2/64
  ipv6 enable
  ipv6 ospf 1 area 0
!
ip route 192.88.99.0 255.255.255.0 Null0
ipv6 route 2002::/16 Tunnel2002



      
661221111211161161111612116121156111141112631122211221112611111211111111
100
  90
  80
  70
  60
  50
  40
  30
  20
  10 **           *  *    *    *    **         *              *
     
0 
....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
              0    5    0    5    0    5    0    5    0    5    0     
5    0
                    CPU% per hour (last 72 hours)
                   * = maximum CPU%   # = average CPU%