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Chapter 3
3-12
2. Add the interfaces to the VLAN external as tagged interfaces. This
is done by specifying the VLAN name, the tagged keyword, and the
interfaces to be tagged. For example:
b vlan external interfaces add tagged 4.1 5.1 5.2
The effect of this command is to associate a tag with interfaces 4.1.and 5.1,
which in turn allows packets with that tag access to the external VLAN.
The above procedure adds multiple tagged interfaces to a single VLAN.
However, you can also add a single tagged interface to multiple VLANs
(similar to the scenario presented in Figure 3.6). This results in a single
interface having more than one tag associated with it. For example, the
following commands add the tagged interface 4.1 to the two VLANs
external and internal:
b vlan external interfaces add tagged 4.1
b vlan internal interfaces add tagged 4.1
Managing the Layer 2 forwarding table
Layer 2 forwarding is the means by which packets are exchanged directly
between nodes on separate VLANs that are members of the same VLAN
group, as described in Creating VLAN groups, on page 3-14. This is
accomplished using a simple forwarding table for each VLAN with proxy
forward enabled. The forwarding table has an entry for each node in the
VLAN and associates the MAC address of that node with the BIG-IP
interface using the following format:
<MAC address> -> <if>
For example:
00:a0:c9:9e:1e:2f -> 4.1
Viewing and editing the L2 forwarding table
You can view the L2 forwarding table, delete entries, and add static entries.
The entries that appear in the table automatically are learned and
periodically updated and are called dynamic entries. Entries that you add to
the table manually are called static entries. Static entries are not
automatically updated. Entering static entries is useful if you have network
devices that do not advertise their MAC addresses.
You can view and edit the L2 forwarding table using the bigpipe vlan
<vlan_name> fdb command. The <vlan_name> may be either a VLAN or
a VLAN group.
To view the L2 forwarding table from the command line
Type the following command:
b vlan <vlan name> fdb show
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