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Chapter 3

3-18

Find the MAC address on both the active and standby units, and pick one

that is similar but unique. A safe technique for selecting the shared MAC

address follows.

Suppose you want to set up mac_masq on the external interfaces. Using the

b interface show command on the active and standby units, you note that

their MAC addresses are:

Active: 3.1 = 0:0:0:ac:4c:a2

Standby: 3.1 = 0:0:0:ad:4d:f3

In order to avoid packet collisions, you now must choose a unique MAC

address. The safest way to do this is to select one of the addresses and

logically OR the first byte with 0x40. This makes the MAC address a

locally administered MAC address.

In this example, either 40:0:0:ac:4c:a2 or 40:0:0:ad:4d:f3 would be a

suitable shared MAC address to use on both BIG-IP units in the redundant

system.

The shared MAC address is used only when the BIG-IP is in active mode.

When the unit is in standby mode, the original MAC address of the network

card is used.

If you do not configure mac_masq on startup, or when transitioning from

standby mode to active mode, the BIG-IP sends gratuitous ARP requests to

notify the default router and other machines on the local Ethernet segment

that its MAC address has changed. See RFC 826 for more details on ARP.

Note

The MAC masquerade information is stored in the bigip_base.conf file.

Self IP addresses

A self IP address is an IP address mapping to one or more VLANs and their

associated interfaces on a BIG-IP. You assign a self IP address to each

interface on the unit as part of Setup configuration, and you also assign a

floating (shared) alias for units in a redundant pair. (A floating self IP

address is the address to which the servers behind the BIG-IP route traffic).

You can create additional self IP addresses for health checking, gateway

failsafe, routing, or other purposes. You can create these additional self IP

addresses using the self command.

To add a self IP address to a VLAN using the Configuration

utility

1. In the navigation pane, click Network.

The VLANs screen opens.

2. Click the Self IP Addresses tab.

3. Click the Add button.

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