Policy-Based Routing; Overview - Dell Force10 C150 Configuration Manual

Policy-based Routing

Policy-based Routing
PBR is supported on the E-Series ExaScale platform with FTOS 8.1.1.0 and later.
PBR is supported on the E-Series TeraScale, C-Series, and S-Series platforms in FTOS 8.4.2.0 and later.
This chapter covers the following topics:
•

Overview

• Implementing Policy-based Routing with FTOS on page 803
• Configuration Task List for Policy-based Routing on page 804
• Create a Redirect List on page 804
• Create a Rule for a Redirect-list on page 805
• Apply a Redirect-list to an Interface using a Redirect-group on page 808
• PBR Exceptions (Permit) on page 807
• Sample Configuration on page 810
Overview
Policy-based Routing (PBR) enables you to make routing decisions based on policies applied to a specific
interface. When a router receives a packet it normally decides where to forward it based on the destination
address in the packet, which is used to look up an entry in a routing table. However, in some cases, there
may be a need to forward the packet based on other criteria: size, source, protocol type, destination, etc.
For example, a network administrator might want to forward a packet that uses TCP across a
different next-hop than packets using ICMP.
Rules for PBR can also be a combination of things:
to go to that destination then route it to this next-hop or onto that specific interface.
routing over different links or towards different networks even while the destination is the same but
depending on where the packet originates.
is supported on platforms:
c e s
when the packet comes from this source and wants
37
This permits
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