show ip cef switching statistic output - some clarifications required

[Alexey Stytsenko]

Good morning, everyone!

I need some clarifications regarding ouput of show ip cef switching statistic on Catalyst 6k and some entries apply to other platforms as well. Consider output:

#show ip cef switching statistics

       Reason                          Drop       Punt  Punt2Host
RP LES No route                      179269          0      12866
RP LES Packet destined for us             0  153061543          2
RP LES No adjacency                12460594          0          0
RP LES Incomplete adjacency           10400          0          0
RP LES Unresolved route                1476          0          0
RP LES Bad checksum                      17          0          0
RP LES TTL expired                        0          0   24725338
RP LES IP options set                     0          0          3
RP LES Fragmentation failed, DF  1757274333          0     481160
RP LES Features                         975          0       5278
RP LES IP redirects                       0          0          7
RP LES Unknown input if                 192          0          0
RP LES Neighbor resolution req     32540982       7290          0
RP LES Total                     1802468238  153068833   25224654

All    Total                     1802468238  153068833   25224654

Questions are:

1) What the difference between rows

RP LES No adjacency
RP LES Incomplete adjacency
RP LES Neighbor resolution req

?

2) What the difference between rows

RP LES No route 
RP LES Unresolved route   

?

3) What does mean collum name - Punt2Host?

I will higly aprecciate your answers! Thnx in advance.

[Alexey Stytsenko]

So far I partially have found answer on first question.

RP LES Neighbor resolution req - here counted packets that have no adjacency and they are punted to arp request to send.

RP LES No adjacency  - after ARP request sent throttling adjacency is installed for this destination for 2 seconds and all subsequent packets get drop.  Those packets are counted here.

RP LES Incomplete adjacency - here packets counted which matches to incomplete adjacencies. Which are stays in adjacency table marked incomplete - as i understand it can happen after arp entry aged out. But those adjacencies must be deleted as well, but as i can see in my environment some of them stays for a while, i am a bit confused here.