Ruijie RG-S2900G-E Series, Configuration Manual

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Configuration Guide DHCPv6 Snooping Configuration
# Enable port-address binding on interface fastethernet 0/10 .
Ruijie# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Ruijie(config)# interface fastethernet 0/10
Ruijie(config-if)# ipv6 verify source port-security
Ruijie(config-if)# end
Ignoring the Failure to Look UP the Destination Port
Forwarding the DHCPv6 response message depends on the lookup in the MAC address table. If the
port corresponding to the MAC address cannot be found, the DHCPv6 response message will not
forwarded for security.
In some special network environments, learning MAC address may be delayed or lost for some
reasons like network congestion, network topology oscillation and too many stacked devices. In this
case, the system prompts
”DHCPV6_Snooping-5-DEST_NOT_FOUND: Could not find destination
port. Destination MAC [mac-address].
” For normal DHCPv6 operation in the entire network, the
packets that the port corresponding to the MAC address is not found are sent to all the ports of the
specific VLAN in broadcast form, or directly forwarded to the source port the DHCP request
message recorded in the DHCPv6 Snooping database.
To ignore the failure to look up the destination port, run the following commands in the privileged
EXEC mode.
Command Function
Ruijie# configure terminal Enter the global configuration mode.
Ruijie(config)# ipv6 dhcp snooping ignore
dest-not-found
Ignore the failure to look up the destination port.
Ruijie(config)# end Exit to the privileged EXEC mode.
To restore the setting to the default value, run the no ipv6 dhcp snooping ignore dest-not-found
command in the global configuration mode.
Configuration example:
Ruijie# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Ruijie(config)# ipv6 dhcp snooping ignore dest-not-found
Ruijie(config)# end
Clearing Dynamically Bound Entries when the Port is Linked Down
Once a port is linked down, the users under the port cannot communicate with external users.
However, the dynamically bound entries still exist until lease period is expired. Disabling this
function is to prevent all entries from losing effectiveness caused by temporary link oscillation.
Consequently, this function is disabled by default.