Cisco Catalyst 4500 Series Configuration Manual page 200

Managing the MAC Address Table
Figure 4-2
L2
Firewall
Network Load Balancers
In this topology, you have two devices, one active and one standby. To perform load balancing, both
devices must receive all packets. You could place both devices on the same VLAN. If learning can be
disabled on this VLAN, the packet is flooded and both devices receive all traffic destined to any MAC
address on the VLAN. You also can assign a multicast MAC address to both load balancers to ensure
that all packets reach them.
Figure 4-3
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
4-34
Disabling MAC Address Learning: Point-to-Point Links
Core Switch
Distribution
External
FW interface
VR
Internal
FW interface
VLAN b
Access Switch
Security Area = (VLAN b, VLAN c)
(Figure
Disabling MAC Address Learning: Network Load Balancers
Gi 3/1
VLAN 10
Core Switch
R
FW Sync
Distribution
Switch Switch
L2/L3
R R
VLAN a VLAN a
Access Switch
VLAN c
VLAN b VLAN c
Access Switch
4-3).
Gi 3/2
VLAN 10
Chapter 4 Administering the Switch
R
External
FW interface
VR
Internal
FW interface
L2
Firewall
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