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UPE PWA traffic loop

Latest reply: Feb 21, 2019 06:46:22 1363 1 1 0 0

Hello there, everyone!


This post is about the UPE PWA traffic loop. Please see more details below.


PHYSICAL NETWORK TOPOLOGY


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FAULT DESCRIPTION


A customer deploys a VIP private line service to access a VSI; a VLL is configured on the ATN and a VSI is configured on both CX. After the customer deploys the services, a traffic loop occurs and the port traffic is 100%.

CONFIGURATION FILES


N/A.


TROUBLESHOOTING


Procedure


Step 1. Log in to the ATN 950B (214.99) and run the display current-configuration interface GigabitEthernet0/2/26.1010 command to check the configurations on the ATN 950B (214.99). Ensure that the configurations are correct.


interface GigabitEthernet0/2/26.1010
  vlan-type dot1q 1010
  description FTTH_ME_VIC013SRT01
  mtu 9000
  mpls l2vc 10.137.126.150 322411 
  mpls l2vc 10.137.126.150 322410 secondary
  mpls l2vpn redundancy master
  mpls l2vpn reroute delay 120

The standard solution configuration is as follows:


interface GigabitEthernet0/4/2.601
 mpls l2vc 3.3.3.3 106001 //Configure a PW between the CSG and the master ASG.
 mpls l2vc 3.3.3.3 106101 secondary// Configure a PW between the CSG and the slave ASG.
 mpls l2vpn redundancy master// Configuring PW Redundancy in Active/Standby Mode
 mpls l2vpn reroute delay 500// Set the WTR time for PW switchback.


Step 2. Log in to CX and run the display current-configuration configuration vsi command to check the VSI 

configuration. It is found that the VSI configuration is incorrect. Two UPE PWs are configured between ASG1 and ASG2. The 

traffic of UPE PW is not isolated. This configuration results in loopback between the PWs between 3.226021 million 

and ASG2.


  • ASG1:

vsi F_VIC038_VIC033_R01
mac-withdraw enable
pwsignal ldp
vsi-id 322601
peer 10.9.66.7 negotiation-vc-id 322611 ignore-standby-state
peer 10.137.126.150 negotiation-vc-id 322602 upe
peer 10.137.126.152 tnl-policy IPRAN upe ignore-standby-state
peer 10.137.126.151 tnl-policy IPRAN upe ignore-standby-state
peer 10.137.126.164 negotiation-vc-id 322411 ignore-standby-state
peer 10.137.126.150 negotiation-vc-id 322402 upe
mtu 9000
ignore-ac-state



  • ASG2:


vsi F_VIC038_VIC033_R01
mac-withdraw enable
pwsignal ldp
vsi-id 322601
peer 10.9.66.7 negotiation-vc-id 322611 ignore-standby-state
peer 10.137.126.153 negotiation-vc-id 322602 upe
peer 10.137.126.152 tnl-policy IPRAN upe ignore-standby-state
peer 10.137.126.151 tnl-policy IPRAN upe ignore-standby-state
peer 10.137.126.164 negotiation-vc-id 322411 ignore-standby-state
peer 10.137.126.153 negotiation-vc-id 322402 upe
mtu 9000
ignore-ac-state


The correct configuration is as follows (can only have one UPE pw between two vsi peer):


vsi vsi_601 static
pwsignal ldp
vsi-id 601
mac-withdraw enable
upe-npe mac-withdraw enable
peer 3.3.3.3 
peer 9.9.9.9 
peer 10.10.10.10 
peer 1.1.1.1 negotiation-vc-id 106101 ignore-standby-state
ignore-ac-state// Because the VSI is not bound to an AC interface on the SPE, you need to run the VSI UP command to configure the VSI on the SPE.


ROOT CAUSE

Configuring multiple data records UPE PW. As a result, VSI becomes Ring, resulting in traffic 100%.

  • x
  • convention:

sim_157
Created Feb 21, 2019 06:46:22

network loop always occured in the inconspicuous place
View more
  • x
  • convention:

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