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1833
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ip dhcp snooping statistics

Arthur Kant
Level 1
Level 1

We are a service provider with an extremely large layer2 for DHCP in some areas.  I just enabled dhcp snooping on this vlan with:

ip dhcp snooping vlan 8

no ip dhcp snooping information option

no ip dhcp snooping verify mac-address

ip dhcp snooping

DHCP still appears to be flowing correctly but I am curious about the statistics Im seeing:

Packets Forwarded                                     = 26739

Packets Dropped                                       = 35498

Packets Dropped From untrusted ports                  = 45

What is causing dropped packets?  I could understand if bad foo was dropped from the untrusted ports but Im not sure of the other.

thanks!

2 Replies 2

Jeff Van Houten
Level 5
Level 5

You do have some ports identified as trusted, correct?

Sent from Cisco Technical Support iPad App

Have you tried the "detail" option of the "show ip dhcp snooping statistics" command?

Packets Dropped Because

IDB not known                                       = 0

Queue full                                          = 0

Interface is in errdisabled                         = 0

Rate limit exceeded                                 = 0

Received on untrusted ports                         = 0

Nonzero giaddr                                      = 0

Source mac not equal to chaddr                      = 0

No binding entry                                    = 0

Insertion of opt82 fail                             = 0

Unknown packet                                      = 0

Interface Down                                      = 0

Unknown output interface                            = 0

Misdirected Packets                                 = 0

Packets with Invalid Size                           = 0

Packets with Invalid Option                         = 0

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_58_se/command/reference/cli2.html#wp11913684

Best Regards

Rolf

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