[c-nsp] bvi stays up even when no pw's are up in bridge-domain - XR 4.1.2

[Aaron]

No.  no ac's are active (up).  There are 2 configured ac pw's in bridge
domain, but they are both down, and bvi remains up.... why ?

Copied from previous posting...

RP/0/RSP0/CPU0:9k#sh run l2v br gr v45
l2vpn
bridge group v45
  bridge-domain v45
   neighbor 10.101.12.250 pw-id 45
    backup neighbor 10.101.12.251 pw-id 45
   routed interface BVI45

**** it shows one AC up, but that's the BVI AC.  Shouldn't the BVI go down
when those 2 pw's are down. ?

RP/0/RSP0/CPU0:9k#sh l2v br gr v45
Bridge group: v45, bridge-domain: v45, id: 4, state: up, ShgId: 0, 
MSTi: 0
  Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog
  Filter MAC addresses: 0
  ACs: 1 (1 up), VFIs: 0, PWs: 2 (0 up), PBBs: 0 (0 up)
  List of ACs:
    BV45, state: up, BVI MAC addresses: 2
  List of Access PWs:
      Neighbor 10.101.12.250 pw-id 45, state: down, Static MAC addresses: 0
      Neighbor 10.101.12.251 pw-id 45, state: down, Static MAC addresses: 0,
backup
  List of VFIs:

**** BVI is still UP!

RP/0/RSP0/CPU0:9k#sh ip vrf one int br bvi 45
Fri May  2 16:17:16.744 CDT

Interface                      IP-Address      Status
Protocol
BVI45                          1.2.3.3    Up                    Up



-----Original Message-----
From: Vitkovský Adam [mailto:adam.vitkovsky at swan.sk] 
Sent: Saturday, May 03, 2014 7:50 AM
To: Aaron; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] bvi stays up even when no pw's are up in bridge-domain
- XR 4.1.2

Hi Aaron,

Are there any attachment circuits active in the bridge-domain? 
The BVI is supposed to stay up only if there is any active bridge port being
it an AC or PW. 
And the line protocol is up when BD is up and the IP is not in conflict. 

adam
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf 
> Of Aaron
> Sent: Friday, May 02, 2014 11:21 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] bvi stays up even when no pw's are up in 
> bridge-domain - XR
> 4.1.2
> 
> Anyone know why this bvi stays up up even though there aren't any L2 
> interfaces/pw's up in this bridge-domain?
> 
> I would like the BVI interface to go down down when there are no 
> underlying layer 2 connections to be serviced.
> 
> This was the way ios switches have always operated. not sure why this 
> isn't acting the same.
> 
> Aaron