Re: Suppression of Downstream Alarms...
Sudheer Dharanikota <sudheer@nayna.com> Wed, 21 November 2001 15:35 UTC
Envelope-to: ccamp-data@psg.com
Delivery-date: Wed, 21 Nov 2001 07:44:22 -0800
Message-ID: <3BFBC9D9.98103AF7@nayna.com>
Date: Wed, 21 Nov 2001 07:35:53 -0800
From: Sudheer Dharanikota <sudheer@nayna.com>
MIME-Version: 1.0
To: Dimitri Papadimitriou <dimitri.papadimitriou@alcatel.be>
CC: Carmine Daloia <daloia@lucent.com>, Jonathan Lang <jplang@calient.net>, ccamp@ops.ietf.org, tsg15q11@itu.int, t1x15@t1.org
Subject: Re: Suppression of Downstream Alarms...
Content-Type: multipart/mixed; boundary="------------5FA23FC1629C90D7D707D4CD"
I am in agreement wih you Dimitri. - sudheer Dimitri Papadimitriou wrote: > Hi Sudheer, > > Of course, the scope is broader than strictly G.709 > based XC, and supportive equipment. This is why we > can really benefit from the generic definition of this > promising protocol while customizing it for specific > technologies like SDH/Sonet, etc. that supports "in-band" > it would be more accurate to say "transport plane" defect > indication. > > Cheers, > - dimitri. > > Sudheer Dharanikota wrote: > > > > Hi Carmine: > > > > Couple of observations... > > > > It seems you are assuming only G.709 based cross connects > > only. > > Please let me know if I am not correct. > > > > LMP-DWDM works for PXC and other crossconencts which does > > not > > use inband fault notification. > > > > Cheers, > > > > sudheer > > > > Carmine Daloia wrote: > > > > > Jonathan, > > > > > > The LMP-WDM document specifies the signaling between the > > > Cross-connect and OLS, assuming they are from different > > > vendors. If they are from different vendors, then a > > > standard interface is needed to exchange some information. > > > One type of information that would need to be exchanged is > > > some OAM signals. Maarten described some of these signals > > > in his VBI document. However, I don't see why OAM signals > > > would have to be exchanged directly between the > > > cross-connects themselves via LMP. > > > > > > Let's look at the following network. > > > > > > OXC1 --- OLSA --- OXC2 --- OLSB --- OXC3 --- OLSC --- OXC4 > > > > > > Note that the OLS consists of DWDM Mux/Dmux Terminals and > > > Optical Amplifiers. > > > > > > Let's assume a failure on OLSA. OLSA via overhead within > > > an OSC suppresses alarms within OLSA. OAM messages (e.g., > > > Optical Channel FDI) could be carried over the LMP-WDM > > > control channel to OXC2. OXC2 will have to forward the FDI > > > signals downstream over the LMP-WDM control channel to > > > OLSB. OLSB will then forward these FDI signals over its > > > OSC and then over the LMP-WDM control channel to OXC3..... > > > etc... > > > > > > Note that OXC2 does not need to directly forward these FDI > > > signals to OXC3. So it is possible, that in LMP-WDM, we > > > may need to define messages corresponding to FDI signals > > > to suppress downstream alarms, however we don't need to > > > define such messages in LMP. > > > > > > Thanks > > > Carmine > > > > > > Jonathan Lang wrote: > > > > > >> Carmine, > > >> Please see inline. > > >> > > >> Thanks, > > >> Jonathan > > >> > > >> > > >> > -----Original Message----- > > >> > From: Carmine Daloia [mailto:daloia@lucent.com] > > >> > Sent: Monday, November 19, 2001 6:44 AM > > >> > To: ccamp@ops.ietf.org > > >> > Cc: tsg15q11@itu.int; t1x15@t1.org > > >> > Subject: LMP: Suppression of Downstream Alarms... > > >> > > > >> > > > >> > Hi all, > > >> > > > >> > As I read through Section 6 "Fault Management", one > > >> > issue that it seems > > >> > to be addressing is "Suppression of Downstream Alarms". > > >> > > > >> > In section 6.2, it states that "If data links fail > > >> > between two PXCs, the > > >> > power monitoring system in all of the downstream nodes > > >> > may detect LOL > > >> > and indicate a failure. To avoid multiple alarms > > >> > stemming from the same > > >> > failure, LMP provides a failure notification through > > >> > the Chann > > >> > elStatus > > >> > message...". > > >> > > > >> > I agree that the suppression of downstream alarms is an > > >> > important issue. > > >> > > > >> great! > > >> > > >> > > >> > If we look at standard networks (both SONET/SDH and > > >> > OTN), this > > >> > capability is already provided by the overhead in > > >> > SDH/SONET and G.709 > > >> > OTN. G.709 OTN handles suppression of alarms in both > > >> > all-optical > > >> > networks as well as opaque networks. I don't think we > > >> > need to burden the > > >> > control plane with such functions when the transport > > >> > plane handles this > > >> > in standard networks. In fact the transport plane > > >> > handles suppression of > > >> > alarms on all equipment in the network (not just > > >> > cross-connects). > > >> > > > >> > If we look at a pre-OTN ("non-standard") scenario > > >> > consisting of > > >> > Cross-connects, Optical Line Systems, and Optical > > >> > Amplifiers supporting > > >> > a DWDM networked solution, we can analyze two > > >> > scenarios. One scenario is > > >> > an opaque network (e.g., the OLS supports 3R). In this > > >> > scenario, the > > >> > downstream Cross-connects would not detect LOL upon f > > >> > aults occurring > > >> > upstream. The 3R points on the OLS Line Systems would > > >> > insert some type > > >> > of signal downs > > >> > tream. Therefore the mechanism described in Section > > >> > 6.2 > > >> > does not apply. Another scenario is an all-optical > > >> > pre-OTN network. Note > > >> > that other equipment besides Cross-connects (e.g., > > >> > Optical Amplifiers) > > >> > in an all-optical network may alarm due to upstream > > >> > faults. These alarms > > >> > also need to be suppressed. LMP seems to only address > > >> > the suppression of > > >> > downstream alarms on cross-connects without taking into > > >> > consideration > > >> > the network that sits between the cross-connects. Is > > >> > LMP also expected > > >> > to have to be processed on Optical Amplifiers? This > > >> > seems to be > > >> > undesirable, especially given all the various > > >> > applications that seem to > > >> > be included into the LMP protocol that would not have > > >> > anything to do > > >> > with Optical Amplifieris. > > >> > > > >> For interaction between cross-connects and Line Systems, > > >> please see OLI > > >> Requirements document > > >> ( > > >> http://search.ietf.org/internet-drafts/draft-many-oli-reqts-00.txt > > >> ) and > > >> corresponding LMP-WDM protocol document (new version to > > >> be uploaded > > >> tomorrow, but old version can be found at > > >> http://search.ietf.org/internet-drafts/draft-fredette-lmp-wdm-02.txt > > >> ). > > >> > > >> > > >> > Any other views? > > >> > > > >> > Carmine > > >> > > > >> >
- Re: FW: [T1X1.5] Re: Suppression of Downstream Al… Carmine Daloia
- FW: [T1X1.5] Re: Suppression of Downstream Alarms… Jonathan Lang
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- RE: [T1X1.5] Re: Suppression of Downstream Alarms… Jonathan Lang
- RE: [T1X1.5] Re: Suppression of Downstream Alarms… Jonathan Lang
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- RE: [T1X1.5] Re: Suppression of Downstream Alarms… Jonathan Lang
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- RE: [T1X1.5] Re: Suppression of Downstream Alarms… George Young
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Dimitri Papadimitriou
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Maarten Vissers
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- Re: Suppression of Downstream Alarms... Sudheer Dharanikota
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- Re: Suppression of Downstream Alarms... Dimitri Papadimitriou
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- Re: Suppression of Downstream Alarms... Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Sudheer Dharanikota
- Re: Suppression of Downstream Alarms... Sudheer Dharanikota
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: [T1X1.5] Re: Suppression of Downstream Alarms… Carmine Daloia
- Re: Suppression of Downstream Alarms... Carmine Daloia
- Re: Suppression of Downstream Alarms... Germano Gasparini
- RE: Suppression of Downstream Alarms... neil.2.harrison
- RE: Suppression of Downstream Alarms... Jonathan Lang
- RE: Suppression of Downstream Alarms... Malcolm Betts