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Cisco Bug: CSCvv94743 - Data Plane fails over L2TPv3 while disabling VLAN limit restrictions with ASR1002-HX

Last Modified

Oct 14, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

16.9.3

Description (partial)

Symptom:
When ever L2 Xconnect PW is UP, and if we attempt to remove the VLAN restriction from subslot 0/1,  using below CLI

hw-module subslot 0/1 ethernet vlan unlimited

Immediately Data plane traffic will get blackholed.

Example 
======
interface TenGigabitEthernet0/1/0.1000
 description *** Extension to  via L2TP tunnel ***
 encapsulation dot1Q 1000
 xconnect 100.128.37.20 1000 encapsulation l2tpv3 pw-class L2TPv3
end



ASR1002-HX#sh xconn all
Legend:    XC ST=Xconnect State  S1=Segment1 State  S2=Segment2 State
  UP=Up       DN=Down            AD=Admin Down      IA=Inactive
  SB=Standby  HS=Hot Standby     RV=Recovering      NH=No Hardware
 
XC ST  Segment 1                         S1 Segment 2                         S2
------+---------------------------------+--+---------------------------------+--
UP pri   ac Te0/1/0.1000:1000(Eth VLAN)    UP l2tp 100.128.37.20:1000              UP

Conditions:
This issue is only noticed with the following combination of hardware  Need to enable back VLAN limitation, in order to resume the traffic across L2 Xconnect circuits

i.e,

" no hw-module subslot 0/1 ethernet vlan unlimited"

/BUILT-IN-EPA-8x10G,

The following CLI "hw-module subslot 0/1 ethernet vlan unlimited", will have a traffic impact on L2 Xconnect circuits
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