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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 4 Administering the Switch
Managing the MAC Address Table
Figure 4-2 Disabling MAC Address Learning: Point-to-Point Links
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).
Figure 4-3 Disabling MAC Address Learning: Network Load Balancers
Core Switch
R
Core Switch
R
Access Switch
External
FW interface
Internal
FW interface
External
FW interface
Internal
FW interface
Distribution
Switch
R
VR
Distribution
Switch
R
VR
VLAN b
VLAN a VLAN a
VLAN c
L2/L3
FW Sync
VLAN c
Access Switch Access Switch
VLAN b
L2
Firewall
L2
Firewall
Security Area = (VLAN b, VLAN c)
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VLAN 10 VLAN 10
Gi 3/2Gi 3/1
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