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[ScreenOS] How do I configure Source-Based & Source Interface Based Routing?

  [KB4273] Show Article Properties


Summary:

This article provides information on how to configure source-based and source interface based routing (SIBR).

Symptoms:
  • Explanation of source-based and source interface based routing (SIBR) tables.

  • How does Source-Based and Source Interface Based Routing (SIBR) Routing work?

  • Source-Based and Source Interface Based Routing(SIBR) configuration example.
Cause:

Solution:

For a detailed explanation of the Source-Based Routing Table and for an example using the WebUI and CLI, refer to the following technical documentation:

ScreenOS Concepts & Examples Guide - Routing (page 20)

For a detailed explanation of the Source Interface Based Routing(SIBR) Table and for an example using the WebUI and CLI, refer to the following technical documentation:

ScreenOS Concepts & Examples Guide - Routing (page 21)


After adding source based or source interface based routes please make sure you enable source based/ source interface based routing at the particular Vr as both the Routing Features are disabled by default.

Via the WebUI, you can enable only source based routing and not source interface based routing. Go to Network > Routing > Source Routing  and select the Source Routing check box.



Via the CLI:

Source Routing: set vrouter <virtual router name> source-routing enable
Source Interface Based Routing: set vrouter <virtual router name>sibr-routing enable

You can check the status of source based or source interface based routing at the particular VR by using the following command:

get vr <virtual router name>

With Route Lookup Preference under consideration, PBR has the highest Preference, followed by Source Interface Based (SIBR), source based, and then destination based with the least preference.

Note: This is applicable with the default preference only and this preference can be changed at the virtual router level.

You can view the route lookup preference on a particular VR by using the following CLI command:

get vr <vr name> route-lookup preference

For more information, refer to KB23236 - How to modify the Route-Lookup Preference?

For more information on Restrictions on Source Interface Based Routing, refer to KB3611 - Restrictions on Source Interface Based Routing .

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