33-13
Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 33 Configuring DHCP Snooping and IP Source Guard
Displaying IP Source Guard Information
Displaying IP Source Guard Information
You can display IP Source Guard PVACL information for all interfaces on a switch using the
show ip verify source command.
• This example shows displayed PVACLs if DHCP snooping is enabled on VLAN 10 through 20, if
interface fa6/1 is configured for IP filtering, and if there is an existing IP address binding 10.0.01
on VLAN 10:
Interface Filter-type Filter-mode IP-address Mac-address Vlan
--------- ----------- ----------- --------------- -------------- ---------
fa6/1 ip active 10.0.0.1 10
fa6/1 ip active deny-all 11-20
Note The second entry shows that a default PVACL (deny all IP traffic) is installed on the port for those
snooping-enabled VLANs that do not have a valid IP source binding.
• This example shows displayed PVACL for a trusted port:
Interface Filter-type Filter-mode IP-address Mac-address Vlan
--------- ----------- ----------- --------------- -------------- ---------
fa6/2 ip inactive-trust-port
• This example shows displayed PVACL for a port in a VLAN not configured for DHCP snooping:
Interface Filter-type Filter-mode IP-address Mac-address Vlan
--------- ----------- ----------- --------------- -------------- ---------
fa6/3 ip inactive-no-snooping-vlan
• This example shows displayed PVACLs for a port with multiple bindings configured for an IP/MAC
filtering:
Interface Filter-type Filter-mode IP-address Mac-address Vlan
--------- ----------- ----------- --------------- -------------- ---------
fa6/4 ip-mac active 10.0.0.2 aaaa.bbbb.cccc 10
fa6/4 ip-mac active 11.0.0.1 aaaa.bbbb.cccd 11
fa6/4 ip-mac active deny-all deny-all 12-20
• This example shows displayed PVACLs for a port configured for IP/MAC filtering but not for port
security:
Interface Filter-type Filter-mode IP-address Mac-address Vlan
--------- ----------- ----------- --------------- -------------- ---------
fa6/5 ip-mac active 10.0.0.3 permit-all 10
fa6/5 ip-mac active deny-all permit-all 11-20
Note The MAC filter shows permit-all because port security is not enabled, so the MAC filter
cannot apply to the port/VLAN and is effectively disabled. Always enable port security first.
• This example shows displayed error message when issuing the show ip verify source command on
a port that does not have an IP source filter mode configured:
IP Source Guard is not configured on the interface fa6/6.
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