Use MPLS cannot access some webpage

Created: Oct 22, 2018 14:45:39Latest reply: Oct 27, 2018 16:14:40 739 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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faysalji  Visitor   Created Oct 23, 2018 11:23:23 Helpful(2) Helpful(2)

Thank You!
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If you think my post/reply is useful, please click the Helpful button and flag my post as a BEST ANSWER. Thanks
garrysister     Created Oct 23, 2018 13:54:17 Helpful(0) Helpful(0)

好分享谢谢
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SupperRobin     Created Oct 23, 2018 13:54:42 Helpful(0) Helpful(0)

When the command is configured, a P device does not need to be enabled with the MPLS L2VPN function.

After the mpls l2vpn command is executed:

    If MPLS L2VPN is disabled on the device, MPLS L2VPN is enabled and the MPLS L2VPN view is displayed.
    If MPLS L2VPN is enabled on the device, the MPLS L2VPN view is displayed. This post was last edited by SupperRobin at 2018-10-31 14:38.
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Torrent     Created Oct 23, 2018 14:34:22 Helpful(0) Helpful(0)

this article is about MPLS , but you only show us how to do capture, can you also explain more about MPLS, what is it? I am very interesting about MPLS for we usually use it in our daily work.

anyway, thanks for sharing us the good example.
This post was last edited by Torrent at 2018-10-31 15:07.
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GongXiaochuan  Visitor   Created Oct 23, 2018 16:42:38 Helpful(0) Helpful(0)

is this only way for troubleshooting about the issue? and if can be explain how to analysis the capture files would be much better for us , thank you

This post was last edited by GongXiaochuan at 2018-10-31 14:09.
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littlestone     Created Oct 24, 2018 08:59:26 Helpful(0) Helpful(0)

This is a great article, I am interested in this article, which is very helpful for our daily troubleshooting. I always have similar problems in my daily work, but I don't know how to deal with them. Now I have a definite idea. Thank you very much for sharing. Hopefully you can update to continue like this
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littlestone     Created Oct 24, 2018 09:00:14 Helpful(0) Helpful(0)

DEVM_1.3.6.1.4.1.2011.5.25.219.2.4.5 hwOpticalInvalid

If the preceding alarm is displayed, collect information about optical modules on the local and remote interfaces and configurations of the interfaces, and contact technical support personnel.

This post was last edited by littlestone at 2018-10-31 13:58.
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wanglei259     Created Oct 27, 2018 15:33:55 Helpful(0) Helpful(0)

Thanks for your sharing ,which is a wonderful guidance, i really interested in this article, which is useful for us and improvement product technology and become to a professional engineer .
I hope that you can insist post new kownlege and skills, i will alawys keep an eye on your sharing.
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Our kingdom is young,our stories are not yet legends.
No.9527  Visitor   Created Oct 27, 2018 16:14:31 Helpful(0) Helpful(0)

On the S5720EI switch, if hardware support for MPLS is displayed as NO in the output of the display device capability command, the switch does not support MPLS. In this case, you need to pay attention to the following points:
  • MPLS cannot be enabled on the S5720EI switch. If the switch has been added to a stack, MPLS cannot be enabled on the stack.
  • The S5720EI switch cannot be added to a stack running MPLS.
This post was last edited by No.9527 at 2018-10-31 11:24.
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