Install guide

50 DHCP Snooping Enhancements Release Note
Software Version 2.9.1
C613-10486-00 REV C
DHCP Snooping Enhancements
This Software Version includes the following enhancements to DHCP
snooping:
■ Adding Default Access Routers to Static Entries
■ Filtering Broadcast and Multicast Packets
This section describes the enhancements. The new and modified commands to
implement them are described in Command Reference Updates.
Adding Default Access Routers to Static Entries
You can now specify the access routers for a static entry. This allows DHCP
snooping to create a static entry for use in conjunction with MAC-Forced
Forwarding. To do this, use the router parameter in the command:
add dhcpsnooping binding[=macaddr] interface=vlan ip=ipadd
port=port-number router=ipadd,ipadd...
Adding a MAC address to the static entry is no longer compulsory. Instead, the
static entry is primarily identified by the IP address. For static DHCP entries
without a MAC address defined, ARP security compares only the IP address
details.
To delete a static entry, you must specify the IP address of the static entry using
the new ip parameter in the command:
delete dhcpsnooping binding ip=ipadd
For more information about MAC-Forced Forwarding, see the MAC-Forced
Forwarding chapter at the end of this Release Note.
Command Changes
The following table summarises the modified commands:
Command Change
add dhcpsnooping binding New router parameter
Modified binding parameter
delete dhcpsnooping binding New ip parameter