PPPoA

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2 total messages Started by Lawrence Baldwin Fri, 16 Feb 2001 13:35

#315

Author: Lawrence Baldwin
Date: Fri, 16 Feb 2001 13:35

30 lines
2255 bytes

http://www.cis.ohio-state.edu/htbin/rfc/rfc2364.html , states:

        Control Signals - The AAL5 layer MUST provide control signals to
        the PPP layer which indicate when the virtual connection link
        has become connected or disconnected.  These provide the "Up"
        and "Down" events to the LCP state machine [1] within the PPP
layer.

Some ASDL providers  purposely disable OAM events within their ATM
networks, thus preventing  the up/down state of the PVC to be propagated
between the two peers in a PPPoA connection.  For example, if a customer
ADSL modem loses sync, the DSLAM may not indicate that event to the
attached PPPoA aggregation router.

Techs I've spoken to at Redback, indicate that this is necessary due to
the many *false* pvc down indications that would occur and that it's not
necessary to relay this info for PPP to work reliably.

Given that this is listed as  "MUST" in the spec, I'm curious if anyone
can think of how this might impact the integrity/reliability of the PPP
FSM (finite state machine).

lb.

-------------------------
Lawrence Baldwin
Protocol Scientist
678-624-0924
http://www.mynetwatchman.com/about.htm - I'm under attack, now what?

Re: PPPoA

#316

Author: fubu
Date: Mon, 19 Feb 2001 06:17

41 lines
2530 bytes

	I think that, if it helps me to get a better high score on
Robotron, then I am all for it.
	Seriously, this was so far over my head, I couldn't even feel
the whoosh <g>


			Fubu
	
On Fri, 16 Feb 2001 08:35:14 -0500, Lawrence Baldwin
<baldwinlSPAMMENOT@mynetwatchman.com> wrote:

>
>http://www.cis.ohio-state.edu/htbin/rfc/rfc2364.html , states:
>
>        Control Signals - The AAL5 layer MUST provide control signals to
>        the PPP layer which indicate when the virtual connection link
>        has become connected or disconnected.  These provide the "Up"
>        and "Down" events to the LCP state machine [1] within the PPP
>layer.
>
>Some ASDL providers  purposely disable OAM events within their ATM
>networks, thus preventing  the up/down state of the PVC to be propagated
>between the two peers in a PPPoA connection.  For example, if a customer
>ADSL modem loses sync, the DSLAM may not indicate that event to the
>attached PPPoA aggregation router.
>
>Techs I've spoken to at Redback, indicate that this is necessary due to
>the many *false* pvc down indications that would occur and that it's not
>necessary to relay this info for PPP to work reliably.
>
>Given that this is listed as  "MUST" in the spec, I'm curious if anyone
>can think of how this might impact the integrity/reliability of the PPP
>FSM (finite state machine).
>
>lb.
>
>-------------------------
>Lawrence Baldwin
>Protocol Scientist
>678-624-0924
>http://www.mynetwatchman.com/about.htm - I'm under attack, now what?

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