Use MPLS cannot access some webpage

Latest reply: Oct 27, 2018 16:14:40 797 10 12 0

[Problem Description] : Since your current problem is that access to some pages is not accessible.

[Problem Analysis] : MPLS is a based MAC Layer 2 forwarding. If the MPLS is affected, it should be that all web pages cannot be accessed normally. And your configuration is fine.

[Next Plan] : We need to capture the package for analysis


Configuration everything is normal, so you need to capture packets analysis

elow are the steps.

  1. Select a PC and directly connect to the switch,
  2. Below are commands on the switch(Please use a PC to perform the following operations separately)
  3. Open the inaccessible webpage using Wireshark on the PC, and then capture the packet. (If you have completed the following, please let us know and we will analyze these messages remotely.)

 

Capture 1

observe-port interface  xxx(Port connected to the PC)

interface xge0/0/48   

port-mirroring to observe-port 1 outbound

 

ACL 4000

rule 5 permit source-mac X-X-X-X( PCs mac address)

rule 10  permit  destination-mac  X-X-X-X( PC’s mac address)

 

traffic classifier c1 operator and

if match ACL 4000

 

traffic behavior b1

mirroring to observe-port 1

 

traffic policy p1

classifier c1 traffic b1

 

interface xge0/0/48

traffic policy p1 outbound/ inbound  (Need to capture packets in two directions separately)

Capture 2

observe-port interface  xxx(Port connected to the PC)

interface xge0/0/4  

port-mirroring to observe-port 1 inbound

 

ACL 4000

rule 5 permit source-mac x-x-x-x( PCs mac address)

rule 10  permit  destination-mac  X-X-X-X( PC’s mac address)

 

traffic classifier c1 operator and

if match ACL 4000

 

traffic behavior b1

mirroring to observe-port 1

 

 

traffic policy p1

classifier c1 traffic b1

 

interface xge0/0/48

traffic policy p1 outbound/ inbound(Need to capture packets in two directions separately)

Capture 3

observe-port interface  xxx(Port connected to the PC)

interface xge0/0/1  

port-mirroring to observe-port 1 outbound/ inbound(Need to capture packets in two directions separately)

Capture 4

observe-port interface  xxx(Port connected to the PC)

interface xge0/0/45

port-mirroring to observe-port 1  outbound/ inbound(Need to capture packets in two directions separately)



The conclusion is obtained through packet capture analysis, and the final problem is the export of third-party gateways.



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Created Oct 27, 2018 16:14:40 Helpful(0) Helpful(0)

This section describes the knowledge you need to know before troubleshooting LDP.

The Label Distribution Protocol (LDP) is a signaling protocol based on routing. LDP is used to provide a simple, unconstrained tunnel for MPLS forwarding.

The tunnel provided by LDP is known as Label switch path (LSP), which does not involve TE and is triggered only by routes. An LSP is a type of Best-Effort tunnel. Currently, LSPs are largely used in VPNs to offer public network tunnels.

This post was last edited by yangyong at 2018-10-31 14:53.
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