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C
LIENT
S
ECURITY
C
OMMANDS
22-6
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, static entries configured in the DHCP snooping
table, 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 (page 22-7) 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 (see page 22-11), 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,
Summary of Contents for 7824M/FSW - annexe 1
Page 2: ......
Page 24: ...TABLE OF CONTENTS xxiv ...
Page 28: ...TABLES xxviii ...
Page 32: ...FIGURES xxxii Figure 16 3 DNS Cache 16 7 ...
Page 34: ...GETTING STARTED ...
Page 46: ...SYSTEM DEFAULTS 1 12 ...
Page 62: ...SWITCH MANAGEMENT ...
Page 74: ...CONFIGURING THE SWITCH 3 12 ...
Page 112: ...BASIC MANAGEMENT TASKS 4 38 ...
Page 168: ...USER AUTHENTICATION 6 30 ...
Page 223: ...SHOWING PORT STATISTICS 9 33 Figure 9 12 Port Statistics ...
Page 230: ...ADDRESS TABLE SETTINGS 10 6 ...
Page 304: ...CLASS OF SERVICE 13 16 ...
Page 316: ...QUALITY OF SERVICE 14 12 ...
Page 338: ...MULTICAST FILTERING 15 22 ...
Page 346: ...DOMAIN NAME SERVICE 16 8 ...
Page 348: ...COMMAND LINE INTERFACE IP Interface Commands 35 1 ...
Page 362: ...OVERVIEW OF COMMAND LINE INTERFACE 17 14 ...
Page 494: ...USER AUTHENTICATION COMMANDS 21 48 ...
Page 514: ...CLIENT SECURITY COMMANDS 22 20 ...
Page 540: ...ACCESS CONTROL LIST COMMANDS 23 26 ...
Page 558: ...INTERFACE COMMANDS 24 18 ...
Page 576: ...MIRROR PORT COMMANDS 26 4 ...
Page 582: ...RATE LIMIT COMMANDS 27 6 ...
Page 616: ...SPANNING TREE COMMANDS 29 28 ...
Page 644: ...VLAN COMMANDS 30 28 ...
Page 664: ...CLASS OF SERVICE COMMANDS 31 20 ...
Page 678: ...QUALITY OF SERVICE COMMANDS 32 14 ...
Page 720: ...APPENDICES ...
Page 726: ...SOFTWARE SPECIFICATIONS A 6 ...
Page 730: ...TROUBLESHOOTING B 4 ...
Page 746: ...INDEX Index 6 ...
Page 747: ......