Cisco Catalyst 4500 Series Configuration Manual page 479

Chapter 2
mac-address-table dynamic group protocols
To enable the learning of MAC addresses in both the "ip" and "other" protocol buckets, even though the
incoming packet may belong to only one of the protocol buckets, use the
mac-address-table dynamic group protocols command. To disable grouped learning, use the no form
of this command.
Syntax Description ip
other
Command Default The group learning feature is disabled.
Command Modes Global configuration mode
Command History Release
12.2(18)EW
Usage Guidelines The entries within the "ip" and "other" protocol buckets are created according to the protocol of the
incoming traffic.
When you use the mac-address-table dynamic group protocols command, an incoming MAC address
that might belong to either the "ip" or the "other" protocol bucket, is learned on both protocol buckets.
Therefore, any traffic destined to this MAC address and belonging to any of the protocol buckets is
unicasted to that MAC address, rather than flooded. This reduces the unicast Layer 2 flooding that might
be caused if the incoming traffic from a host belongs to a different protocol bucket than the traffic that
is destined to the sending host.
Examples The following example shows that the MAC addresses are initially assigned to either the "ip" or the
"other" protocol bucket:
Switch# show mac-address-table dynamic
Unicast Entries
vlan
-------+---------------+--------+---------------------+--------------------
1
1
1
1
1
1
1
1
mac-address-table dynamic group protocols {ip | other} {ip | other}
no mac-address-table dynamic group protocols {ip | other} {ip | other}
Specifies the "ip" protocol bucket.
Specifies the "other" protocol bucket.
Modification
This command was introduced on the Catalyst 4500 series switch.
mac address type
0000.0000.5000 dynamic other
0001.0234.6616 dynamic ip
0003.3178.ec0a dynamic assigned
0003.4700.24c3 dynamic ip
0003.4716.f475 dynamic ip
0003.4748.75c5 dynamic ip
0003.47f0.d6a3 dynamic ip
0003.47f6.a91a dynamic ip
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
mac-address-table dynamic group protocols
protocols
GigabitEthernet1/1
GigabitEthernet3/1
GigabitEthernet3/1
GigabitEthernet3/1
GigabitEthernet3/1
GigabitEthernet3/1
GigabitEthernet3/1
GigabitEthernet3/1
port
2-439