Manual Chapter : Configuring an EtherIP Tunnel

Applies To:

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BIG-IP Analytics

  • 14.1.2

BIG-IP AFM

  • 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP ASM

  • 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP AAM

  • 15.0.0, 14.1.2, 14.1.0

BIG-IP APM

  • 15.0.1, 15.0.0, 14.1.2, 14.1.0

BIG-IP LTM

  • 15.0.1, 15.0.0, 14.1.2, 14.1.0
Manual Chapter

Configuring an EtherIP Tunnel

Overview: Preserving BIG-IP connections during live virtual machine migration

In some network configurations, the BIG-IP® system is configured to send application traffic to destination servers that are implemented as VMware® virtual machines (VMs). These VMs can undergo live migration, using VMware vMotion, across a wide area network (WAN) to a host in another data center. Optionally, an iSession® tunnel could provide WAN optimization.
To preserve any existing connections between the BIG-IP system and a virtual machine while the virtual machine migrates to another data center, you can create an EtherIP tunnel.
An
EtherIP tunnel
is an object that you create on each of two BIG-IP systems that sit on either side of a WAN. The EtherIP tunnel uses the industry-standard EtherIP protocol to tunnel Ethernet and IEEE 802.3 media access control (MAC) frames across an IP network. The two EtherIP tunnel objects together form a tunnel that logically connects two data centers. When the application traffic that flows between one of the BIG-IP systems and the VM is routed through the EtherIP tunnel, connections are preserved during and after the VM migration.
After you have configured the BIG-IP system to preserve connections to migrating VMs, you can create a Virtual Location monitor for the pool. A
Virtual Location
monitor ensures that the BIG-IP system sends connections to a local pool member rather than a remote pool one, when some of the pool members have migrated to a remote data center.
The BIG-IP system that is located on each end of an EtherIP tunnel can be part of a redundant system configuration. Make sure that both units of any redundant system configuration reside on the same side of the tunnel.

Illustration of EtherIP tunneling in a VMotion environment

EtherIP tunneling in a VMware vMotion environment
EtherIP tunneling in a vMotion environment

Task summary for implementing an EtherIP tunneling configuration

Implement an EtherIP tunneling configuration to prevent the system from dropping existing connections to migrating virtual machines in a VMware VMotion environment.
Perform these tasks on the BIG-IP system in both the local data center and the remote data center.

Creating a VLAN

VLANs
represent a logical collection of hosts that can share network resources, regardless of their physical location on the network. You create a VLAN to associate physical interfaces with that VLAN.
  1. On the Main tab, click
    Network
    VLANs
    .
    The VLAN List screen opens.
  2. Click
    Create
    .
    The New VLAN screen opens.
  3. In the
    Name
    field, type a unique name for the VLAN.
  4. In the
    Tag
    field, type a numeric tag, between 1-4094, for the VLAN, or leave the field blank if you want the BIG-IP system to automatically assign a VLAN tag.
    The VLAN tag identifies the traffic from hosts in the associated VLAN.
  5. If you want to use Q-in-Q (double) tagging, use the
    Customer Tag
    setting to perform the following two steps. If you do not see the
    Customer Tag
    setting, your hardware platform does not support Q-in-Q tagging and you can skip this step.
    1. From the
      Customer Tag
      list, select
      Specify
      .
    2. Type a numeric tag, from 1-4094, for the VLAN.
    The customer tag specifies the inner tag of any frame passing through the VLAN.
  6. For the
    Interfaces
    setting,
    1. From the
      Interface
      list, select an interface number.
    2. From the
      Tagging
      list, select
      Untagged
      .
    3. Click
      Add
      .
  7. For the
    Hardware SYN Cookie
    setting, select or clear the check box.
    When you enable this setting, the BIG-IP system triggers hardware SYN cookie protection for this VLAN.
    Enabling this setting causes additional settings to appear. These settings appear on specific BIG-IP platforms only.
  8. For the
    Syncache Threshold
    setting, retain the default value or change it to suit your needs.
    The
    Syncache Threshold
    value represents the number of outstanding SYN flood packets on the VLAN that will trigger the hardware SYN cookie protection feature.
    When the
    Hardware SYN Cookie
    setting is enabled, the BIG-IP system triggers SYN cookie protection in either of these cases, whichever occurs first:
    • The number of TCP half-open connections defined in the LTM setting
      Global SYN Check Threshold
      is reached.
    • The number of SYN flood packets defined in this
      Syncache Threshold
      setting is reached.
  9. For the
    SYN Flood Rate Limit
    setting, retain the default value or change it to suit your needs.
    The
    SYN Flood Rate Limit
    value represents the maximum number of SYN flood packets per second received on this VLAN before the BIG-IP system triggers hardware SYN cookie protection for the VLAN.
  10. Click
    Finished
    .
    The screen refreshes, and it displays the new VLAN in the list.

Creating an EtherIP tunnel object

Before you perform this task, you must know the self IP address of the instance of the VLAN that exists, or will exist, on the BIG-IP system in the other data center.
The purpose of an EtherIP tunnel that contains an EtherIP type of profile is to enable the BIG-IP system to preserve any current connections to a server that is using VMware vMotion for migration to another data center.
  1. On the Main tab, click
    Network
    Tunnels
    Tunnel List
    Create
    .
    The New Tunnel screen opens.
  2. In the
    Name
    field, type a unique name for the tunnel.
  3. From the
    Profile
    list, select
    etherip
    .
  4. In the
    Local Address
    field, type the self IP address of the local BIG-IP system.
  5. In the
    Remote Address
    field, type the self IP address of the remote BIG-IP system.
  6. If the BIG-IP system is part of an HA cluster, select the corresponding traffic group from the
    Traffic Group
    list.
  7. Click
    Finished
    .

Creating a VLAN group

VLAN groups consolidate Layer 2 traffic from two or more separate VLANs.
  1. On the Main tab, click
    Network
    VLANs
    VLAN Groups
    .
    The VLAN Groups list screen opens.
  2. From the VLAN Groups menu, choose List.
  3. Click
    Create
    .
    The New VLAN Group screen opens.
  4. In the General Properties area, in the
    VLAN Group
    field, type a unique name for the VLAN group.
  5. For the
    VLANs
    setting, from the
    Available
    field select the
    internal
    and
    external
    VLAN names, and click
    <<
    to move the VLAN names to the
    Members
    field.
  6. Click
    Finished
    .

Creating a self IP address for a VLAN

Ensure that you have at least one VLAN configured before you create a self IP address.
Self IP addresses enable the BIG-IP system, and other devices on the network, to route application traffic through the associated VLAN.
  1. On the Main tab, click
    Network
    Self IPs
    .
  2. Click
    Create
    .
    The New Self IP screen opens.
  3. In the
    Name
    field, type a unique name for the self IP address.
  4. In the
    IP Address
    field, type an IPv4 or IPv6 address.
    This IP address should represent the address space of the VLAN that you specify with the
    VLAN/Tunnel
    setting.
  5. In the
    Netmask
    field, type the network mask for the specified IP address.
    For example, you can type
    255.255.255.0
    .
  6. From the
    VLAN/Tunnel
    list, select the VLAN to associate with this self IP address.
    • On the internal network, select the internal or high availability VLAN that is associated with an internal interface or trunk.
    • On the external network, select the external VLAN that is associated with an external interface or trunk.
  7. Use the default values for all remaining settings.
  8. Click
    Finished
    .
    The screen refreshes, and displays the new self IP address.
The BIG-IP system can now send and receive TCP/IP traffic through the specified VLAN.

Creating a self IP for a VLAN group

Before you create a self IP address, ensure that you have created at least one VLAN or VLAN group.
A self IP address enables the BIG-IP system and other devices on the network to route application traffic through the associated VLAN or VLAN group.
  1. On the Main tab, click
    Network
    Self IPs
    .
  2. Click
    Create
    .
    The New Self IP screen opens.
  3. In the
    IP Address
    field, type a self IP address for the VLAN group. In the example shown, this IP address is
    10.0.0.6
    .
  4. In the
    Netmask
    field, type the network mask for the specified IP address.
    For example, you can type
    255.255.255.0
    .
  5. From the
    VLAN/Tunnel
    list, select the name of the VLAN group you previously created.
  6. From the
    Port Lockdown
    list, select
    Allow Default
    .
  7. Click
    Finished
    .
    The screen refreshes, and displays the new self IP address.
The BIG-IP system can send and receive traffic through the specified VLAN or VLAN group.

Creating a Virtual Location monitor

When the BIG-IP system is directing application traffic to pool members that are implemented as virtual machines, you should configure a Virtual Location type of monitor on the BIG-IP system. A
Virtual Location
monitor determines if a pool member is local to the data center or remote, and assigns a priority group to the pool member accordingly. The monitor assigns remote pool members a lower priority than local members, thus ensuring that the BIG-IP directs application requests to local pool members whenever possible.
  1. On the Main tab, click
    Local Traffic
    Monitors
    .
    The Monitors List screen opens.
  2. Click
    Create
    .
    The New Monitor screen opens.
  3. Type
    my_virtual_location_monitor
    in the
    Name
    field.
  4. From the
    Type
    list, select
    Virtual Location
    .
  5. From the
    Configuration
    list, select
    Advanced
    .
  6. Retain the default value (in seconds) of
    5
    in the
    Interval
    field.
  7. Retain the default value of
    Disabled
    in the
    Up Interval
    list.
  8. Retain the default value (in seconds) of
    0
    in the
    Time Until Up
    field.
  9. Retain the default value (in seconds) of
    16
    in the
    Timeout
    field.
  10. Type the name of the pool that you created prior to configuring EtherIP tunneling in the
    Pool Name
    field.
  11. Click
    Finished
    .
After configuring the Virtual Location monitor, the BIG-IP system assigns each member of the designated pool a priority group value to ensure that incoming connections are directed to a local pool member whenever possible.
F5 Networks recommends that you verify that BIG-IP DNS has automatically assigned a BIG-IP type of monitor to BIG-IP Local Traffic Manager (LTM). A BIG-IP type of monitor can use the priority group assigned to each pool member to retrieve a
gtm_score
value.

Syncing the BIG-IP configuration to the device group

Before you sync the configuration, verify that the devices targeted for config sync are members of a device group and that device trust is established.
This task synchronizes the BIG-IP configuration data from the local device to the devices in the device group. This synchronization ensures that devices in the device group operate properly. When synchronizing self IP addresses, the BIG-IP system synchronizes floating self IP addresses only.
You perform this task on either of the two devices, but not both.
  1. On the Main tab, click
    Device Management
    Overview
    .
  2. In the Device Groups area of the screen, click the arrow next to the name of the relevant device group.
    The screen expands to show a summary and details of the sync status of the selected device group, as well as a list of the individual devices within the device group.
  3. In the Devices area of the screen, choose the device that shows a sync status of
    Changes Pending
    .
  4. In the Sync Options area of the screen, select
    Push the selected device configuration to the group
    .
  5. Click
    Sync
    .
    The BIG-IP system syncs the configuration data of the selected device to the other members of the device group.

Implementation result

After you configure EtherIP tunneling on the BIG-IP system, you must perform the same configuration procedure on the BIG-IP system in the remote data center to fully establish the EtherIP tunnel.
After the tunnel is established, the BIG-IP system preserves any open connections to migrating (or migrated) virtual machine servers.