Edge-Core ECS3510-10PD Management Manual page 928

| General Security Measures
C 24
HAPTER
IPv4 Source Guard
ip source-guard
This command configures the switch to filter inbound traffic based on
source IP address, or source IP address and corresponding MAC address.
Use the no form to disable this function.
S
YNTAX
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.
D S
EFAULT ETTING
Disabled
C M
OMMAND ODE
Interface Configuration (Ethernet)
C U
OMMAND SAGE
Source guard is used to filter traffic on an insecure port which receives
◆
messages from outside the network or fire wall, 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 ip 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, VLAN identifier, and
port identifier.
◆ Static addresses entered in the source guard binding table with the
source-guard binding
infinite lease time. Dynamic entries learned via DHCP snooping are
configured by the DHCP server itself.
◆ If the IP source guard is enabled, an inbound packet's IP address (sip
option) or both its IP address and corresponding MAC address (sip-mac
option) will be checked against the binding table. If no matching entry
is found, the packet will be dropped.
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command are automatically configured with an
ip