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Manual Chapter: Overview of TMOS Routing
Manual Chapter
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Overview of IP routing administration in TMOS

As a BIG-IP ®system administrator, you typically manage routing on the system by configuring these BIG-IP system features.

Table 1. BIG-IP system features for route configuration
BIG-IP system feature Benefit
Route domains You create route domains to segment traffic associated with different applications and to allow devices to have duplicate IP addresses within the same network.
Local IP addresses Whenever you create virtual addresses and self IP addresses on the BIG-IP system, the system automatically adds routes to the system that pertain to those addresses, as directly-connected routes.
Static routes For destination IP addresses that are not on the directly-connected network, you can explicitly add static routes. You can add both management (administrative) and TMM static routes to the BIG-IP system.
Advanced routing modules You can configure the advanced routing modules--a set of dynamic routing protocols and core daemons--to ensure that the BIG-IP system can learn about routes from other routers and advertise BIG-IP system routes. These advertised routes can include BIG-IP virtual addresses.
The ARP cache You can manage static and dynamic entries in the ARP cache to resolve IP addresses into MAC addresses.

About BIG-IP system routing tables

The BIG-IP system contains two sets of routing tables:

  • The Linux routing tables, for routing administrative traffic through the management interface
  • A special TMM routing table, for routing application and administrative traffic through the TMM interfaces

As a BIG-IP administrator, you configure the system so that the BIG-IP system can use these routing tables to route both management and application traffic successfully.

About BIG-IP management routes and TMM routes

The BIG-IP system maintains two kinds of routes:

Management routes
Management routes are routes that the BIG-IP system uses to forward traffic through the special management interface. The BIG-IP system stores management routes in the Linux (that is, kernel) routing table.
TMM routes
TMM routes are routes that the BIG-IP system uses to forward traffic through the Traffic Management Microkernel (TMM) interfaces instead of through the management interface. The BIG-IP system stores TMM routes in both the TMM and kernel routing tables.

Viewing routes on the BIG-IP system

You can use the tmsh utility to view different kinds of routes on the BIG-IP system.
  1. Open a console window, or an SSH session using the management port, on the BIG-IP system.
  2. Use your user credentials to log in to the system.
  3. Perform one of these actions at the command prompt:
    • To view all routes on the system, type: tmsh show /net route
    • To view all configured static routes on the system, type: tmsh list /net route
You are now able to view BIG-IP system routes.
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