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ERS3600 - Globally disabling ADAC crashes all FA VLAN bindings on uplink ports

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TitleERS3600 - Globally disabling ADAC crashes all FA VLAN bindings on uplink ports
Symptoms

Take an ERS3600 connected to a Fabric environment, where it is connected to a VSP FA Server on its uplinks and has some VLAN I-SID bindings configured locally.

In this example, ERS has uplink 1/23 where it learns FA mgmt VLAN 209; also a couple of locally defined VLAN/ISID bindings.

ERS3600#show fa elements

 ===============================================================================
 Fabric Attach Discovered Elements
 ===============================================================================
 UNIT/ MGMT ELEM ASGN
 PORT TYPE VLAN STATE SYSTEM ID AUTH AUTH
 -------------------------------------------------------------------------------
 1/23 Server 209 T / S b4:2d:56:53:cc:00:00:00:00:0d AP AP
 
 ===============================================================================
 Fabric Attach Authentication Detail
 ===============================================================================
 UNIT/ ELEM OPER ASGN OPER
 PORT EXPANDED TYPE AUTH STATUS AUTH STATUS
 -------------------------------------------------------------------------------
 1/23 Server (Auth) successAuth successAuth
 
 -------------------------------------------------------------------------------
 1 out of 1 total number of Fabric Attach discovered elements displayed
 acli-dev.pl: Displayed Record Count = 2
 -------------------------------------------------------------------------------
 
ERS3600#show fa assignment

 I-SID VLAN Source Status
 -------- ---- ----------------------------- --------
 2800200 200 Proxy Active
 2800210 210 Proxy Active
 
 Binding Count: 2
 
ERS3600#show vlan interface info 1/23

           Filter     Filter
          Untagged Unregistered
Unit/Port  Frames     Frames    PVID PRI    Tagging    Name
--------- -------- ------------ ---- --- ------------- ---------------
1/23         No         Yes        1   0     TagAll    Unit 1,Port 23

ERS3600#show vlan interface vids 1/23

Unit/Port VLAN VLAN Name         VLAN VLAN Name         VLAN VLAN Name
--------- ---- ----------------  ---- ----------------  ---- ----------------
1/23      1    VLAN #1           200  VLAN #200         209  VLAN #209 
          210  VLAN #210
--------- ---- ----------------  ---- ----------------  ---- ----------------
Above VLANs 200,209 and 210 are configured on the FA uplink.

Apply this config:

 adac op-mode tagged-frames
 adac voice-vlan 5
 adac uplink-port 1/23
 adac enable

Disable ADAC globally:

ERS3600(config)#no adac enable
 Connection lost (EOF)

If you were connected to the ERS via the uplink the ERS is lost.

Via serial console, you can see that FA VLANs are lost 

ERS3600#show vlan interface info 1/23

           Filter     Filter
          Untagged Unregistered
Unit/Port  Frames     Frames    PVID PRI    Tagging    Name
--------- -------- ------------ ---- --- ------------- ---------------
1/23         No         Yes        1   0     UntagAll  Unit 1,Port 23

ERS3600#show vlan interface vids 1/23

Unit/Port VLAN VLAN Name         VLAN VLAN Name         VLAN VLAN Name
--------- ---- ----------------  ---- ----------------  ---- ----------------
1/23      1    VLAN #1          
--------- ---- ----------------  ---- ----------------  ---- ----------------
Environment
  • ERS3600
  • 6.3.0.0
Cause
The root cause is unknown yet
Resolution
An issue is currently investigated by the engineering team.
Additional notes

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