SMC Networks SMC Tiger 10/100 SMC6128L2 - Manual (Page 566)

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OMMAND
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NTERFACE
4-266
• Static addresses entered in the source guard binding table with the ip
source-guard binding command (page 4-267) 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.
• 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.
• Filtering rules are implemented as follows:
- If the DHCP snooping is disabled (page 4-270), IP source guard
will check the VLAN ID, source IP address, port number, and
source MAC address (for the sip-mac option). If a matching entry
is found in the binding table and the entry type is static IP source
guard binding, the packet will be forwarded.
- If the DHCP snooping is enabled, IP source guard will check the
VLAN ID, source IP address, port number, and source MAC
address (for the sip-mac option). If a matching entry is found in
the binding table and the entry type is static IP source guard
binding, static DHCP snooping binding or dynamic DHCP
snooping binding, the packet will be forwarded.
- If IP source guard if enabled on an interface for which IP source
bindings (dynamically learned via DHCP snooping or manually
configured) are not yet configured, the switch will drop all IP
traffic on that port, except for DHCP packets.
Example
This example maps enables IP source guard on port 5.
Related Command
ip source-guard binding (4 -267)
ip dhcp snooping (4 -270)
ip dhcp snooping vlan (4 -272)
Console(config)#interface ethernet 1/5
Console(config-if)#ip source-guard sip
Console(config-if)#