RE: [Bridge-mib] Support of LAN FCS in Ethernet packet over ATM AAL5.

Nurit,

Please take this discussion off the hubmib list. I do not think this is relevant for this working group, which focuses on management of Ethernet interfaces and devices. 

Thanks,

Dan


> -----Original Message-----
> From: Nurit Sprecher [mailto:[email protected]]
> Sent: Thursday, June 27, 2002 11:19 AM
> To: 'Manuel Stol'; PPPoE Mailing List (E-mail)
> Cc: '[email protected]'; '[email protected]'
> Subject: [Bridge-mib] Support of LAN FCS in Ethernet packet over ATM
> AAL5.
> 
> 
> In RFC 2684 on Multiprotocol Encapsulation over ATM 
> Adaptation Layer 5, the
> Payload Format for Bridged Ethernet/802.3 PDUs is defined as follows:
> 
>                 +-------------------------------+
>                 |    MAC destination address    |
>                 +-------------------------------+
>                 |                               |
>                 |   (remainder of MAC frame)    |
>                 |                               |
>                 +-------------------------------+
>                 |  LAN FCS (if PID is 0x00-01)  |
>                 +-------------------------------+
>  
> The LAN FCS option is VC dependent. 
> In case that the LAN FCS is supported, duplicate checksum 
> calculations are
> performed: one for the AAL5 frame and one for the Ethernet frame.
> 
> In what cases is it required/suggested/worth to support the 
> LAN FCS when
> transmitting a packet within an AAL5 packet over an ATM network? 
> 
> Can a bridge that resides at the end of the ATM, de-capsulate 
> the ATM packet
> and transmit the Ethernet packet over a LAN, calculate the 
> LAN FCS and set
> it in the Ethernet packet (if required)?
> 
> Thanks in advance, 
> Nurit Sprecher
> 
> 
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