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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
493
Command Function Mode
ip source-guard Configures the switch to filter inbound traffic based on source
IPaddress, or source IP address and corresponding MAC
address
IC
ip source-guard binding Adds a static address to the source-guard binding table GC
show ip source-guard Shows whether source guard is enabled or disabled on
eachinterface
PE
show ip source-guardbinding Shows the source guard binding table PE
Table 5-45 IP Source Guard Commands
ip source-guard
This command configures the switch to filter inbound traffic based source IP address, or source IP address and corresponding
MAC address. Use the no form to disable this function.
Syntax
ip source-guard {sip | sip-mac}
no ip source-guard
sip -Filters traffic based on IP addresses stored in the binding table.
sip-mac -Filters traffic based on IP addresses and corresponding MAC addresses stored in the binding table.
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet)
Command Usage
• Source guard is used to filter traffic on an unsecure port which receives messages from outside the network or firewall,
and therefore may be subject to traffic attacks caused by a host trying to use the IP address of a neighbor.
• Setting source guard mode to “sip” or “sip-mac” enables this function on the selected port. Use the “sip” option to check
the VLAN ID, source IP address, and port number against all entries in the binding table. Use the “sip-mac” option to
check these same parameters, plus the source MAC address. Use the no source guard command to disable this
function on the selected port.
• When enabled, traffic is filtered based upon dynamic entries learned via DHCP snooping, or static addresses
configured in the source guard binding table.
• Table entries include a MAC address, IP address, lease time, entry type (Static-IP-SG-Binding,
Dynamic-DHCP-Binding, Static-DHCP-Binding), VLAN identifier, and port identifier.
• Static addresses entered in the source guard binding table with the ip source-guard binding command are
automatically configured with an infinite lease time. Dynamic entries learned via DHCP snooping are configured by the
DHCP server itself; static entries include a manually configured lease time.