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Cisco Systems WSC4500X16SFP Manual De Usuario

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31-9
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 31      Configuring DHCP Snooping and IP Source Guard
Configuring DHCP Snooping on the Switch
Switch# renew ip dhcp snoop data tftp://10.1.1.1/directory/file
Loading directory/file from 10.1.1.1 (via GigabitEthernet1/1): !
[OK - 457 bytes]
Database downloaded successfully.
Switch#
00:01:29: %DHCP_SNOOPING-6-AGENT_OPERATION_SUCCEEDED: DHCP snooping database Read 
succeeded.
Switch#
Switch# show ip dhcp snoop data
Agent URL : 
Write delay Timer : 300 seconds
Abort Timer : 300 seconds
Agent Running : No
Delay Timer Expiry : Not Running
Abort Timer Expiry : Not Running
Last Succeded Time : 15:24:34 UTC Sun Jul 8 2001
Last Failed Time : None
Last Failed Reason : No failure recorded.
Total Attempts       :        1   Startup Failures :        0
Successful Transfers :        1   Failed Transfers :        0
Successful Reads     :        1   Failed Reads     :        0
Successful Writes    :        0   Failed Writes    :        0
Media Failures       :        0
Switch#
Switch# show ip dhcp snoop bind
MacAddress          IpAddress        Lease(sec)  Type           VLAN  Interface
------------------  ---------------  ----------  -------------  ----  --------------------
00:01:00:01:00:05   1.1.1.1          49810       dhcp-snooping  512   GigabitEthernet1/1
00:01:00:01:00:02   1.1.1.1          49810       dhcp-snooping  512   GigabitEthernet1/1
00:01:00:01:00:04   1.1.1.1          49810       dhcp-snooping  1536  GigabitEthernet1/1
00:01:00:01:00:03   1.1.1.1          49810       dhcp-snooping  1024  GigabitEthernet1/1
00:01:00:01:00:01   1.1.1.1          49810       dhcp-snooping  1     GigabitEthernet1/1
Switch#
Switch#clear ip dhcp snoop bind
Switch#sh ip dhcp snoop bind   
MacAddress          IpAddress        Lease(sec)  Type           VLAN  Interface
------------------  ---------------  ----------  -------------  ----  --------------------
Switch#
Example 3: Adding Information to the DHCP Snooping Database
To manually add a binding to the DHCP snooping database, perform the following task:
Command
Purpose
Step 1
Switch# show ip dhcp snooping binding
Views the DHCP snooping database
Step 2
Switch# ip dhcp snooping binding 
binding-id vlan 
vlan-id interface interface expiry lease-time
Adds the binding using the 'ip dhcp snooping' exec 
command
Step 3
Switch# show ip dhcp snooping binding 
Checks the DHCP snooping database