Chapter 9
| General Security Measures
IPv6 Source Guard
– 372 –
◆ If IPv6 source guard is enabled, an inbound packet’s source IPv6 address will be
checked against the binding table. If no matching entry is found, the packet
will be dropped.
â—† Filtering rules are implemented as follows:
â–
If ND snooping and DHCPv6 snooping are disabled, IPv6 source guard will
check the VLAN ID, source IPv6 address, and port number. If a matching
entry is found in the binding table and the entry type is static IPv6 source
guard binding, the packet will be forwarded.
â–
If ND snooping or DHCPv6 snooping is enabled, IPv6 source guard will
check the VLAN ID, source IP address, and port number. If a matching entry
is found in the binding table and the entry type is static IPv6 source guard
binding, dynamic ND snooping binding, or dynamic DHCPv6 snooping
binding, the packet will be forwarded.
â–
If IPv6 source guard is enabled on an interface for which IPv6 source
bindings (dynamically learned via ND snooping or DHCPv6 snooping, or
manually configured) are not yet configured, the switch will drop all IPv6
traffic on that port, except for ND packets and DHCPv6 packets allowed by
DHCPv6 snooping.
â–
Only IPv6 global unicast addresses are accepted for static bindings.
Example
This example enables IP source guard on port 5.
Console(config)#interface ethernet 1/5
Console(config-if)#ipv6 source-guard sip
Console(config-if)#
RELATED COMMANDS
ipv6 source-guard binding (369)
ipv6 dhcp snooping (352)
ipv6 dhcp snooping vlan (357)
ipv6 source-guard
max-binding
This command sets the maximum number of entries that can be bound to an
interface. Use the no form to restore the default setting.
Syntax
ipv6 source-guard max-binding number
no ipv6 source-guard max-binding
number - The maximum number of IPv6 addresses that can be mapped to
an interface in the binding table. (Range: 1-5)
Default Setting
5
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