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Cisco Cisco Email Security Appliance C160 Mode D'Emploi

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33-16
Cisco AsyncOS 8.0.2 for Email User Guide
 
Chapter 33      Advanced Network Configuration 
  Direct Server Return
Note
Using the loopback interface prevents the appliance from issuing ARP replies for that specific interface.
When enabling DSR, the following rules apply:
  –
All systems use the same Virtual IP (VIP) address
  –
All systems must be on the same switch and subnet as the load balancer
Figure 33-4
Using DSR to Load Balance Between Multiple Cisco Appliances on a Switch
Enabling the Loopback Interface via the etherconfig Command
Once enabled, the loopback interface is treated like any other interface (e.g. Data 1):
IronPort Appliance 1
VIP 1.1.1.1/32
A:B:C:D:E:1
IronPort Appliance 2
VIP 1.1.1.1/32
A:B:C:D:E:2
Load Balancer
VIP 1.1.1.1
Default Gateway
Switch
mail3.example.com> etherconfig
Choose the operation you want to perform:
- MEDIA - View and edit ethernet media settings.
- PAIRING - View and configure NIC Pairing.
- VLAN - View and configure VLANs.
- LOOPBACK - View and configure Loopback.
- MTU - View and configure MTU.
[]> loopback
Currently configured loopback interface: