04_05_转发MPLS VPN报文

2019年7月27日 06:39 作者：金淼淋分类：MPLS  641

MPLS VPN Technology
YES LAB
Forwarding MPLS VPN Packets
4?'kMPLS VPNiki
YES LAB
wwwveslabnet Outline
YES LAB
— Overview
— What Are the End-to-End VPN Forwarding
Mechanisms?
- What Is VPN PHP?
{TZ-ZVPN PHP?
— Propagating VPN Labels Between PE Routers?
— What Are the Effects of MPLS VPNs on Label
Propagation?
MPLS ?
— What Are the Effects of MPLS VPNs on Packet
Forwarding?
MPLS ?
— Summary
wwwveslabnet VPN Label Propagation
MPLS VPN Backbone
CE Router
In
PE
CE Router
ress
outer
P Router
P Router
YES LAB
CE Router
Egress
PE Router
CE Router
Question: How will the ingress PE router get the second label in the label stack from the
egress PE router?
Answer: Labels are propagated in MP-BGP VPNv4 routing updates.
wwwveslabnet VPN Label Propagation
MPLS VPN Backbone
CE Router
CE Router
Step 1:
Step 2:
Step 3:
26
In ress
PE outer
LSP Forwarding
P Router
P Router
Egress
PE Router
CE Router
CE Router
A VPN label is assigned to every VPN route by the egress PE router.
The VPN label is advertised to all Other PE routers in an MP-BGP update.
A label stack is built in the VRF table. VRF4Üt11iJH
wwwveslabnet