Applies To:Show Versions
BIG-IP Link Controller
Configuring nPath Routing
Overview: Layer 2 nPath routing
About Layer 2 nPath
- The default route on the content servers must be set to the router's internal address (10.1.1.1in the illustration) rather than to the BIG-IP system's floating self IP address (10.1.1.10). This causes the return packet to bypass the BIG-IP system.
- If you plan to use an nPath configuration for TCP traffic, you must create a Fast L4 profile with the following custom settings:
- Enable theLoose Closesetting. When you enable this setting, the TCP protocol flow expires more quickly, after a TCP FIN packet is seen. (A FIN packet indicates the tearing down of a previous connection.)
- Set theTCP Close Timeoutsetting to the same value as the profile idle timeout if you expect half closes. If not, you can set this value to 5 seconds.
- Because address translation and port translation have been disabled, when the incoming packet arrives at the pool member it is load balanced to the virtual server address (126.96.36.199in the illustration), not to the address of the server. For the server to respond to that address, that address must be configured on the loopback interface of the server and configured for use with the server software.
Guidelines for UDP timeouts
Guidelines for TCP timeouts
Creating a Fast L4 profile
- On the Main tab, click.The Fast L4 screen opens.
- ClickCreate.The New Fast L4 profile screen opens.
- In theNamefield, type a unique name for the profile.
- Select theCustomcheck box.
- Select theLoose Closecheck box only for a one-arm virtual server configuration.
- Set theTCP Close Timeoutsetting, according to the type of traffic that the virtual server will process.
Creating a server pool for nPath routing
- On the Main tab, click.The Pool List screen opens.
- ClickCreate.The New Pool screen opens.
- In theNamefield, type a unique name for the pool.
- For theHealth Monitorssetting, in theAvailablelist, select a monitor type, and click<<to move the monitor to theActivelist.Hold the Shift or Ctrl key to select more than one monitor at a time.
- Using theNew Memberssetting, add each resource that you want to include in the pool:
- (Optional) In theNode Namefield, type a name for the node portion of the pool member.
- In theAddressfield, type an IP address.
- In theService Portfield, type a port number, or select a service name from the list.
- (Optional) In thePriorityfield, type a priority number.
Creating a virtual server for Layer 2 nPath routing
- On the Main tab, click.The Virtual Server List screen opens.
- ClickCreate.The New Virtual Server screen opens.
- In theNamefield, type a unique name for the virtual server.
- For theDestination Address/Masksetting, confirm that theHostbutton is selected, and type the IP address in CIDR format.The supported format is address/prefix, where the prefix length is in bits. For example, an IPv4 address/prefix is10.0.0.1or10.0.0.0/24, and an IPv6 address/prefix isffe1::0020/64or2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4 address without specifying a prefix, the BIG-IP system automatically uses a/32prefix.The IP address you type must be available and not in the loopback network.
- From theConfigurationlist, selectAdvanced.
- From theTypelist, selectPerformance (Layer 4).
- From theProtocollist, select one of the following:
- *All Protocols
- From theProtocol Profile (Client)list, select a predefined or user-defined Fast L4 profile.
- For theAddress Translationsetting, clear theEnabledcheck box.
- For thePort Translationsetting, clear theEnabledcheck box.
- In the Resources area of the screen, from theDefault Poollist, select the relevant pool name.