[c-nsp] Converting ATM to VLAN

[Dan Armstrong]

A router is not really a layer2 device, and you using it here as a 
switch.  A WS-X5158 or 5161 LANE card in a 5500 switch does exactly what 
you want to do en mass...



Clayton Zekelman wrote:

>I have a situation where I have ATM PVC's coming in (Bridged RFC 1483) and 
>need to convert it to a VLAN dot1q trunk.  I'm doing this for a handful of 
>paths, as the ATM enabled router is not the router I need the path to end 
>up on.  If it were, I'd likely do ATM RBE.
>
>I do the following:
>
>interface ATM0/0/0.48 point-to-point
>  description MNS-191+B VLAN 48 IP Transit
>  bridge-group 48
>  pvc MNS-191+B 1/70
>   ubr 12500
>   encapsulation aal5snap
>  !
>!
>interface FastEthernet0/0/0.48
>  description MNS-191+B  IP Transit
>  encapsulation dot1Q 48
>  bridge-group 48
>!
>bridge 48 protocol ieee
>bridge 48 route ip
>
>For some reason, things don't work properly unless I add:
>
>interface BVI48
>  no ip address
>
>Can anyone shed any light on why I need to add the BVI?  It *appears* to do 
>nothing:
>
>uacA1#show bridge 48 ver
>
>Total of 300 station blocks, 281 free
>Codes: P - permanent, S - self
>
>BG Hash      Address      Action  Interface      VC    Age   RX count   TX 
>count
>48 5F/0   0005.5ea1.5f00 
>forward  Fa0/0/0.48      -      0     885110     892382
>48 CC/0   00d0.ffb5.cc00 
>forward  ATM0/0/0.48     15     0     892633     884682
>
>Flood ports (BG 48)          RX count    TX count
>ATM0/0/0.48                       249         213
>FastEthernet0/0/0.48              213         249
>
>The strange thing is, when we cut over, it worked fine without the BVI for 
>an hour or two, then the whole thing went down, and wouldn't come back up 
>until I added the BVI.
>
>
>
>---
>Clayton Zekelman
>Managed Network Systems Inc. (MNSi)
>344-300 Tecumseh Rd. E.
>Windsor, Ontario
>N8X 5E8
>
>tel. 519-985-8410
>fax. 519-258-3009 
>
>
>  
>