PE PBR
This document provides a simple explanation of what Policy Based Routing (PBR) is and how it works in PE (Provider Edge) devices. However, the basic rules are the same as those in CE (Customer Edge) devices.
PBR stands for Policy-Based Routing. This technology allows network administrators to decide where a data packet will go. They don't just look at the final destination of the packet, but also look at many other things like the type of packet or where it came from. This allows them to better control the traffic in the network and create different rules for different needs.
See the CE PBR documentation. It explains in simple terms how to configure, modify, and delete. The basics and methods are the same for both.
Link to CE PBR Documentation: CE PBR Document
Core Concepts of PBR
Below are the key fields used when configuring a PBR rule, along with their descriptions:
| Field | Description |
|---|---|
| Priority | PBR rules are checked in order, with lower numbers given more importance. |
| Lookup | Determines where the rule applies. |
| Input Interface | Where the traffic comes from and matches the rule. |
| Output Interface | Interface for sending specific traffic. |
| Source IP Address | Its range is determined by combining the sender's IP address and netmask. |
| Select Source Netmask | NA netmask is used with the source IP to find a specific network range. |
| Source Port | The port from which the traffic originated |
| Destination IP Address | The receiver's IP address determines which traffic rule applies. |
| Select Destination Netmask | The destination IP and netmask are used for a specific IP range. |
| Destination Port | The port to which traffic is sent |
| Invert | If enabled, the rule applies to all but the defined IP and port. |
| Action | Provides options to edit or delete the IP Rule. |
Basic Process of Implementing PBR
The general procedure for performing PBR is as follows, although there may be minor variations depending on the manufacturer and model of your PE device.
- Defining PBR Rules: Specify specific rules, such as where the data comes from (source IP), where it goes (destination port), and what to do next (e.g., where to send the data).
- Applying PBR Policies to Interfaces: Attaching the defined PBR (Policy Based Routing) rules to the PE (Provider Edge) device for specific interfaces. Traffic coming into this interface will then be checked against the defined PBR policy.
- Verification: Checking and verifying the PBR configuration to see if the road is running properly according to traffic rules.