RE: [EFM] RE: Pause frame usage in transport networks
Jeffrey,
I rest my case relative to the support of Active Flow Control by G.gfp.
As you stated, ""G.gfp" (G.7041) does not explicitly address generation,
termination, or transport of pause frames...or any other
Ethernet/MAC-related functions that are beyond the scope of G.7041...G.7041
does not have, does not need, and should not have, "support for" 802.3x
pause frames."
If any transmission vendor does support 802.3x it is non-standard relative
to the transport mapping of Ethernet frames as part of G.gfp technology
interfaces. As most of the people in 802.3WG realize, anything
non-standard by any one vendor can not be relied upon to work with any
other vendors' equipment.
Thank you,
Roy Bynum
At 11:28 AM 2/24/2003 -0500, Towne, Jeffrey R (Jeff) wrote:
>Roy,
>
>I disagree with the statement
> "If they deployed technology based on G.gfp, they can't
> generate pause frames to provide rate limiting..."
>
>While "G.gfp" (G.7041) does not explicitly address generation, termination,
>or transport of pause frames (or other Ethernet/MAC-specific control
>functions), this does not mean that equipment that uses GFP is prohibited
>from dealing with pause frames (or any other Ethernet/MAC-related functions
>that are beyond the scope of G.7041).
>G.7041 does not have, does not need, and should not have, "support for"
>802.3x pause frames - 802.3x does.
>I am aware of equipment that both uses G.7041 and provides options for
>transparently transporting and for terminating/generating pause frames to
>satisfy various applications.
>
>Jeff Towne
>
> -----Original Message-----
> From: Roy Bynum [mailto:rabynum@mindspring.com]
> Sent: Friday, February 21, 2003 2:37 PM
> To: Shahram Davari; 'Siamack Ayandeh'
> Cc: Ben Brown; Geoff Thompson; mattsquire@acm.org; Chau Chak;
> stds-802-3-efm@ieee.org
> Subject: RE: [EFM] RE: Pause frame usage in transport networks
>
> Shahram,
>
> Depending on the technology that the major carrier you refer to
>implemented
> in their initial deployment, it may be more of a case of they
>"can't"
> support active flow control instead of they "don't". If they
>deployed
> technology based on G.gfp, they can't generate pause frames to
>provide rate
> limiting and are thus the customer is totally dependant on his own
>internal
> bandwidth management, which can be very expensive.
>
> The last time that I looked at it, G.gfp does not have support for
>802.3x
> pause frames. The initial transmission vendor offerings based on
>G.gfp do
> not have the capability to generate Ethernet "pause" frames. Later
> versions of G.gfp may include the use of 802.3x MAC control frames
>and the
> transmission equipment vendors may implement it.
>
> ...