Cisco 7604 Configuration Manual page 568
Ios software configuration guide
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Configuring DHCP Snooping
Successful Transfers :
Successful Reads
Successful Writes
Media Failures
First successful access: Read
Last ignored bindings counters :
Binding Collisions
Invalid interfaces
Parse failures
Last Ignored Time : None
Total ignored bindings counters:
Binding Collisions
Invalid interfaces
Parse failures
Router#
The first three lines of output show the configured URL and related timer-configuration values. The next
three lines show the operating state and the amount of time left for expiry of write delay and abort timers.
Among the statistics shown in the output, startup failures indicate the number of attempts to read or
create the file that failed on bootup.
Create a temporary file on the TFTP server with the touch command in the TFTP server daemon
Note
directory. With some UNIX implementations, the file should have full read and write access permissions
(777).
DHCP snooping bindings are keyed on the MAC address and VLAN combination. If an entry in the
remote file has an entry for a given MAC address and VLAN set for which the router already has a
binding, the entry from the remote file is ignored when the file is read. This condition is referred to as
the binding collision.
An entry in a file may no longer be valid because the lease indicated by the entry may have expired by
the time it is read. The expired leases counter indicates the number of bindings that are ignored because
of this condition. The Invalid interfaces counter refers to the number of bindings that have been ignored
when the interface referred by the entry either does not exist on the system or is a router or DHCP
snooping trusted interface (if it exists) when the read happened. Unsupported VLANs refers to the
number of entries that have been ignored because the indicated VLAN is not supported on the system.
The Parse failures counter provides the number of entries that have been ignored when the router is
unable to interpret the meaning of the entries from the file.
The router maintains two sets of counters for these ignored bindings. One provides the counters for a
read that has at least one binding ignored by at least one of these conditions. These counters are shown
as the "Last ignored bindings counters." The total ignored bindings counters provides a sum of the
number of bindings that have been ignored because of all the reads since the router bootup. These two
sets of counters are cleared by the clear command. The total counter set may indicate the number of
bindings that have been ignored since the last clear.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
37-16
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Failed Transfers :
:
0
Failed Reads
:
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Failed Writes
:
0
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0
Expired leases
:
0
Unsupported vlans :
:
0
:
0
Expired leases
:
0
Unsupported vlans :
:
0
Chapter 37
Configuring DHCP Snooping
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