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Rewriting Packet Header Information

Junos OS Class of Service Configuration Guide

Overview
Configuration
Troubleshooting

Rewriting Packet Header Information

Rewriting Packet Header Information Overview

Header Bits Preserved, Cleared, and Rewritten

Setting IPv6 DSCP and MPLS EXP Values Independently

Classifiers and Rewrite Rules at the Global and Physical Interface Levels Overview

Rewriting Packet Header Information
Rewriting Packet Header Information Overview Header Bits Preserved, Cleared, and Rewritten Setting IPv6 DSCP and MPLS EXP Values Independently Classifiers and Rewrite Rules at the Global and Physical Interface Levels Overview

Rewriting Packet Header Information

Rewriting Packet Header Information Overview

Header Bits Preserved, Cleared, and Rewritten

Setting IPv6 DSCP and MPLS EXP Values Independently

Classifiers and Rewrite Rules at the Global and Physical Interface Levels Overview

Configuration Tasks for Applying Rewrite Rules
Applying Default Rewrite Rules Configuring Rewrite Rules Applying Rewrite Rules to Output Logical Interfaces Configuring DSCP Values for IPv6 Packets Entering the MPLS Tunnel Applying IEEE 802.1p Rewrite Rules to Dual VLAN Tags Applying IEEE 802.1ad Rewrite Rules to Dual VLAN Tags Configuring Classifiers and Rewrite Rules at the Global and Physical Interface Levels

Configuration Tasks for Applying Rewrite Rules

Applying Default Rewrite Rules

Configuring Rewrite Rules

Applying Rewrite Rules to Output Logical Interfaces

Configuring DSCP Values for IPv6 Packets Entering the MPLS Tunnel

Applying IEEE 802.1p Rewrite Rules to Dual VLAN Tags

Applying IEEE 802.1ad Rewrite Rules to Dual VLAN Tags

Configuring Classifiers and Rewrite Rules at the Global and Physical Interface Levels

Configuration Tasks for Rewriting Packet Header Information
Rewriting MPLS and IPv4 Packet Headers Rewriting the EXP Bits of All Three Labels of an Outgoing Packet Rewriting IEEE 802.1p Packet Headers with an MPLS EXP Value Configuring the IEEE 802.1p Field for CoS Host Outbound Traffic Configuring a Global Default IEEE 802.1p Value for All Host Outbound Traffic Applying Egress Interface Rewrite Rules to the IEEE 802.1p Field for All Host Outbound Traffic on the Interface Setting Ingress DSCP Bits for Multicast Traffic over Layer 3 VPNs Assigning the Default Frame Relay DE Loss Priority Map to an Interface Defining a Custom Frame Relay Loss Priority Map

Configuration Tasks for Rewriting Packet Header Information

Rewriting MPLS and IPv4 Packet Headers

Rewriting the EXP Bits of All Three Labels of an Outgoing Packet

Rewriting IEEE 802.1p Packet Headers with an MPLS EXP Value

Configuring the IEEE 802.1p Field for CoS Host Outbound Traffic

Configuring a Global Default IEEE 802.1p Value for All Host Outbound Traffic

Applying Egress Interface Rewrite Rules to the IEEE 802.1p Field for All Host Outbound Traffic on the Interface

Setting Ingress DSCP Bits for Multicast Traffic over Layer 3 VPNs

Assigning the Default Frame Relay DE Loss Priority Map to an Interface

Defining a Custom Frame Relay Loss Priority Map

Example
Example: Per-Node Rewriting of EXP Bits

Configuration Statements
[edit class-of-service] Hierarchy Level code-point default (CoS Host Outbound Traffic) dscp (Rewrite Rules) dscp (Rewrite Rules on Physical Interface) dscp-ipv6 (Class-of-Service) exp exp-push-push-push exp-swap-push-push forwarding-class (BA Classifiers) frame-relay-de (Defining Loss Priority Maps) host-outbound-traffic ieee-802.1 (Rewrite Rules on Logical Interface) ieee-802.1 (Host Outbound Traffic) ieee-802.1 (Rewrite Rules on Physical Interface) ieee-802.1ad import (Rewrite Rules) inet-precedence inet-precedence (Rewrite Rules on Physical Interface) interfaces loss-priority (BA Classifiers) loss-priority-maps loss-priority-maps (Assigning to an Interface) protocol (Rewrite Rules) rewrite-rules (CoS Host Outbound Traffic) rewrite-rules (Definition) rewrite-rules (Interfaces) rewrite-rules (Physical Interfaces) unit vlan-tag

Configuration Statements

[edit class-of-service] Hierarchy Level

code-point

default (CoS Host Outbound Traffic)

dscp (Rewrite Rules)

dscp (Rewrite Rules on Physical Interface)

dscp-ipv6 (Class-of-Service)

exp

exp-push-push-push

exp-swap-push-push

forwarding-class (BA Classifiers)

frame-relay-de (Defining Loss Priority Maps)