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Command Line Interface
4-140
4
• 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
ip
source-guard binding
command (page 4-141) are automatically configured
with an 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.
• Filtering rules are implemented as follows:
- If DHCP snooping is disabled (see page 4-132), 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, 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 enables IP source guard on port 5.
Related Commands
ip source-guard binding (4-141)
ip dhcp snooping (4-132)
ip dhcp snooping vlan (4-133)
Console(config)#interface ethernet 1/5
Console(config-if)#ip source-guard sip
Console(config-if)#
Summary of Contents for 8126PL2-F
Page 1: ...MANAGEMENT GUIDE ta TigerSwitchTM 10 100 1000 L2 Lite SMB PoE Gigabit Switch SMC8126PL2 F ...
Page 2: ......
Page 6: ...vi ...
Page 22: ...Contents xxii ...
Page 26: ...Tables xxvi ...
Page 48: ...Initial Configuration 2 10 2 ...
Page 117: ...User Authentication 3 69 3 Web Click Security AAA Summary Figure 3 43 AAA Accounting Summary ...
Page 590: ...Command Line Interface 4 302 4 ...
Page 604: ...Glossary Glossary 8 ...
Page 612: ...Index 8 Index ...
Page 613: ......
Page 614: ...149100000023A R01 SMC8126PL2 F ...