From: Snow, Tim (timothy.snow@eds.com)
Date: Wed Aug 13 2003 - 04:25:51 GMT-3
I believe that UDLD is just a mechanism to detect UDLR. UDLD is typically
bad in an ethernet (e, fe, ge) environment but picture this. Imagine a
satellite office with a high speed, high latency satellite link
(unidirectional) for receiving a data feed and it also has a 56k connection
to send acks to the provider.
I believe this was what Mr. Berkowitz was referring to when he said " it
really tends to need a reverse channel, often slow, for acknowledgements and
the like. "
There are also other technologies that have things in place for these type
of things which if you study correctly, you'll run into them.
Burning the candle at both ends,
Tim
#12042
-----Original Message-----
From: Alec [mailto:clapun@graduate.hku.hk]
Sent: Wednesday, August 13, 2003 3:11 AM
To: wing_lam@jossynergy.com; Howard C. Berkowitz
Cc: ccielab@groupstudy.com
Subject: Re: UDLR
As far as I know for ethernet, you can try to disconnect or cut the RX or TX
copper pair to simulate UDLD.
----- Original Message -----
From: <wing_lam@jossynergy.com>
To: "Howard C. Berkowitz" <hcb@gettcomm.com>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, August 13, 2003 12:45 PM
Subject: Re: UDLR
> Hi Howard,
>
> I just wanna study any feature that the router can be configured, as this
> seems a valid topic in CCIE LAB exam.
>
> Yeah, I would like to similate the situation with unidirectional link, how
> can I setup the serial port?
>
> You're right, I have a return path and I am setup to test the multicast
> traffic.
>
> I have read though the following link already and would like to have a
test
> on it. But I don't know how to similate a uni-directional link using
simply
> Serial, or Ethernet etc.
>
> Any idea?
>
> Thx a lot!
> BBD (Big Black Dog)
>
>
>
>
>
> "Howard C.
> Berkowitz" To:
ccielab@groupstudy.com
> <hcb@gettcomm.com cc:
> > Subject: Re: UDLR
> Sent by:
> nobody@groupstudy
> .com
>
>
> 08/13/2003 12:38
> AM
> Please respond to
> "Howard C.
> Berkowitz"
>
>
>
>
>
>
> At 10:36 PM +0800 8/12/03, wing_lam@jossynergy.com wrote:
> >Hi group,
> >
> >Can any body suggest me method to run UDLR? I mean how can I find a
> >interface similar the situation like one way satellite?
> >
>
> Be sure you understand what ULDR does. While it's called
> "Unidirectional Link Routing," for data applications, it really tends
> to need a reverse channel, often slow, for acknowledgements and the
> like. The original intention for ULDR in the IETF was for video
> broadcasts and the like, which are truly one-way applications, and
> often multicast. I'd strongly recommend reading the IETF documents
> and even getting on the mailing list/reading the archives.
>
> Most of the development is in France and Japan.
>
> What is the problem you are trying to solve?
>
>
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