6to4 relay on IOS <-> CEF switching?

Dominik Bay d.bay at cablesurf.de
Thu Oct 9 19:04:14 CEST 2008


Am 09.10.2008 um 17:26 schrieb Gert Doering:
>  I have seen output from a 2800 that was all nicely CEF switched, with
> 12.4 mainline, so in theory it should work.

#sh cef int tun2002
Tunnel2002 is up (if_number 18)
   Corresponding hwidb fast_if_number 18
   Corresponding hwidb firstsw->if_number 18
   Internet Protocol processing disabled
   Interface is marked as tunnel interface
   Packets switched to this interface are punted to the next slow  
path: Unsupported tunnel mode
   Hardware idb is Tunnel2002
   Fast switching type 14, interface type 0
   IP CEF switching disabled
   IP Null turbo vector
   Input fast flags 0x0, Input fast flags2 0x0, Output fast flags 0x0,  
Output fast flags2 0x0
   ifindex 15(15)
   Slot -1 Slot unit -1 Unit 2002 VC -1
   Transmit limit accumulator 0x0 (0x0)
   IP MTU 1480

#sh int tun2002 stats
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                Processor    1318134 1128731936     504142   76165243
           Route cache  299007180 3735509587   68376334 3207098151
                Total  300325314 4864241523   68880476 3283263394

#sh ipv6 cef sum
IPv6 CEF is enabled and running centrally.
Slow processing intvl = 1 seconds backoff level current/max 0/0
0 unresolved prefixes, 0 requiring adjacency update
IPv6 CEF default table
36 prefixes

#sh ver
Cisco IOS Software, 2801 Software (C2801-ADVENTERPRISEK9-M), Version  
12.4(19a), RELEASE SOFTWARE (fc1)
System image file is "flash:c2801-adventerprisek9-mz.124-19a.bin"

This Box is also doing ISATAP and Static v6 Tunnels without  
Performance Issues.
(I've to test again, but I'm rather sure that I've seen 80Mbps with  
full MTU Packets on this Box)


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