RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-15.txt
john.loughney@nokia.com Mon, 08 September 2003 04:07 UTC
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Subject: RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-15.txt
Date: Mon, 08 Sep 2003 05:51:52 +0300
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Thread-Topic: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-15.txt
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Brian, These looked reasonable, I am in the process of adding them. thanks, John > -----Original Message----- > From: ext Brian F. G. Bidulock [mailto:bidulock@openss7.org] > Sent: 05 September, 2003 17:27 > To: Loughney John (NRC/Helsinki); sigtran@ietf.org > Subject: Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-15.txt > > > John, > > Did you ever get a chance to look at any of these? > > --brian > > Brian F. G. Bidulock wrote: > (Sat, 26 Jul 2003 08:02:15) > > John, > > > > Actually, there are a lot of problems with the changes made from > > sua-14 to sua-15 as follows: > > > > + SCTP - Stream Control Transport Protocol. > > > > That would be Stream Control TRANSMISSION Protocol. There > are quite a > > few places in the document where this error is made. Even in the > > references: > > > > + Signalling Connection Control Part-User signalling over > IP using the > > + Stream Control Transport Protocol. The protocol is > designed to be > > + modular and symmetric, to allow it to work in diverse > architectures, > > + such as a Signalling Gateway to IP Signalling Endpoint > architecture > > + as well as a peer-to-peer IP Signalling Endpoint > architecture. > > > > - [2960] RFC 2960 "Stream Control Transport Protocol" R. > > + [2960] RFC 2960 "Stream Control Transport Protocol", R. > > Stewart, et al, November 2000. > > > > Please use "Siganlling" instead of "Signaling". > > > > + PC - Signaling System no. 7 Point Code. > > > > Network Appearance: > > > > + Network Appearance - The Network Appearance is an SUA local > > + reference (typically an integer) shared by SG and AS > that together > > + with a Signalling Point Code or global title uniquely > identifies an > > + SS7 node by indicating the specific SS7 network it belongs to. > > > > Network appearance has no meaning in relationship to a Global Title. > > Global Titles are independent of signalling point code and are only > > meaningful to the node performing global title translation. Strike > > global title from the definition. > > > > + code (PC) and sub-system number (SSN). The subsystem > identified by > > > > That should be "subsystem number," no hyphen. > > > > 1.4.1 Support for the transport of SCCP-User Messages > > > > The SUA supports the transfer of SCCP-user messages. > The SUA layer > > - at the SG and at the ASP support the seamless transport > the user > > - messages between the SG and the ASP. > > + at the signaling gateway and at the ASP support the seamless > > + transport the user messages between the signaling > gateway and the > > + ASP. > > > > Above should be "transport of user messages" instead of > "transport the > > user messages". > > > > 1.4.2 SCCP Protocol Class Support > > > > - Depending upon the SCCP-users supported, the SUA shall > support the 4 > > + Depending upon the SCCP-users supported, the SUA supports the 4 > > possible SCCP protocol classes transparently. The SCCP > protocol > > classes are defined as follows: > > > > Why the removal of SHALL? > > > > 1.5.2 Address Mapping at the ASP > > > > - An ASP routes responses to the SGP that it received > messages from; > > - within the routing context which it is currently active and > > - receiving traffic. The routing context itself is used > by the ASP to > > - select the SGP. > > + An ASP routes all responses to the SGP that it received > messages > > + from; within the routing context which it is currently > active and > > + receiving traffic. The ASP uses the routing context to > select the > > + SGP. > > > > The second sentence is clearer, but the first sure is not. > > > > 1.5.4 SCTP Stream Mapping > > > > - The SUA supports SCTP streams. The SG/AS needs to > maintain a list of > > - SCTP and SUA-users for mapping purposes. SCCP-users requiring > > - sequenced message transfer need to be sent over a > stream supporting > > - sequenced delivery. > > + The SUA supports SCTP streams. Signaling Gateway SG and > Application > > + Servers need to maintain a list of SCTP and SUA-users > for mapping > > + purposes. SCCP-users requiring sequenced message > transfer need to > > + be sent over a stream supporting sequenced delivery. > > > > Above use "Signalling" instead of "Signaling". Also, ALL > SCTP streams > > support sequenced delivery. Please say "stream with > sequenced delivery" > > instead of "stream supporting sequenced delivery". > > > > + The Reserved field is set to 0 in messages sent, is not > be examined > > + on reception. > > + > > > > Please make the above a proper sentence. Something like: > "The Reserved > > field is set to 0 in messages sent and is not to be > examined in messages > > received." > > > > Implementation note: This message covers the following SCCP > > messages: unitdata (UDT), extended unitdata (XUDT), > long unitdata > > - (LUDT). > > + (LUDT). Sequence Control is set to 0 for class 0 messages. > > > > This change is incorrect. Please remove this addition. We > discussed this > > long ago and Sequence Control is required in class 0 > messages for some > > network configurations and for proper MTP relay accross a > relay point. > > It might not be provided by the SCCP/SUA-User for class 0, > but then the > > SUA layer (at ASP, IPSP or SGP) must ultimately select a > loadsharing value. > > That is why we made the parameter MANDATORY for all > protocol classes. > > > > Note 1: When the SSN is included, the DUNA message > corresponds to > > - the SCCP N-STATE primitive. When SSN is not, > the DUNA > > - message corresponds to the SCCP N-PCSTATE > primitive. > > + the SCCP N-STATE primitive, and contains > just one point > > + code in the Affected Point Code parameter. > When SSN is > > + not, the DUNA message corresponds to the > SCCP N-PCSTATE > > + primitive. > > > > The DUNA can contain multiple affected point codes even if > the SSN is > > included. This is particularly the case when the SG or > IPSP supports > > the same subsystem on multiple point codes. Please put it back the > > way it was. > > > > - Note 1: When the SSN is included, the SCON message > corresponds to > > - the SCCP N-STATE primitive. When SSN is not > included, the > > - SCON message corresponds to the SCCP > N-PCSTATE primitive. > > + Note 1: When the SSN is included it must be equal to > 1. If the > > + SSN is included the SCON corresponds to the > N-PCSTATE > > + primitive used to convey the Restricted > Importance Level > > + (RIL) to the SCCP user. When the SSN is not > included, the > > + SCON message corresponds to the SCCP > N-PCSTATE primitive > > + reporting signalling point or network > congestion status. > > > > No, the SSN doesn't have to be 1. Where did you get that idea? > > > > - Note 1: The DUPU corresponds to the SCCP N-PCSTATE > primitive. > > + Note 1: The DUPU corresponds to the SCCP N-PCSTATE > primitive, and > > + contains in the Affected Point Code > parameter just one > > + point code. > > > > Particularly as User/Cause is always the SCCP SI number, > multiple affected > > point codes can occur. Please put it back the way it was. > > > > 3.4.6 Destination Restricted (DRST) > > > > The DRST message is optionally sent from the SG to all > concerned > > ASPs to indicate that the SG has determined that one or more > > destinations are now restricted from the point of view > of the SG, or > > in response to a DAUD message if appropriate. The SUA > layer at the > > ASP is expected to send traffic to the affected > destination via an > > alternate SG of equal priority, but only if such an > alternate route > > - exists and is available. If the affected destination is > currently > > - considered unavailable by the ASP, the peer should be > informed that > > - traffic to the affected destination can be resumed. In > this case, > > - the SUA layer should route the traffic through the SG > initiating the > > - DRST message. > > + exists and is available. If the ASP currently considers > the affected > > + destination unavailable, the peer should be informed > that traffic to > > + the affected destination could be resumed. In this > case, the SUA > > + layer should route the traffic through the SG > initiating the DRST > > + message. > > > > This is only true if the DRST corresponds to TFR. Note > also that the > > DRST cannot correspond to N-PCSTATE because there is no > N-PCSTATE primitive > > for PC restriction (it is an MTP concept only). This > message corresponds to > > N-COORD that has little to do with the description above, > no matter how is is > > worded exactly. > > > > - 0x17 Routing Key Change Refused > > + 0x17 Not Used in SUA > > > > Good, but you forgot to remove the statement later: > > > > The "Routing Key Change Refused" error is sent when the > SG refuses a > > change in the Routing Key parameters. > > > > > > - User/Cause 0x010C > > + Cause / User 0x010C > > > > Everwhere else in the document it is referred to as > User/Cause, execpt here: > > > > 3.10.12 Cause / User > > > > Change both of these to "User/Cause". > > > > 0010 This is most commonly used in North American > networks. > > The Translation Type implicitly determines Nature of > > Address and Numbering Plan. This data can be > configured > > in the SG. The number of digits is always even and > > determined by the SCCP address length. > > - 0011 Numbering Plan and > Translation Type are tak > > + 0011 Numbering Plan and > Translation Type are taken over. It > > is implicitly assumed that the Nature of Address = > > Unknown. > > - 0100 This format is used in > international networ > > + 0100 This format is used in > international networks and most > > commonly in networks outside North America. All > > information to populate the source address > is present in > > the SCCP Address. > > > > Above is text extending past 72 columns that was truncated > in sua-14. Please > > shift the text over. > > > > 0 Unknown > > 1 - 63 International services > > 64 - 127 Spare > > - 128 > 254 National network specific > > + 128 û 254 National network specific > > 255 Reserved > > > > Non ASCII character, again. > > > > Value Description > > 0x0 No special options > > 0x1 Return message on error > > > > - Bits 3-7 are spare and SHOULD be coded > zero, and MUS > > + Bits 3-7 are spare and SHOULD be coded > zero, and MUST be > > ignored by the receiver. > > > > Again text extending beyond 72 columns. > > > > 4.3 AS and ASP State Maintenance > > > > - The SUA layer on the SGP maintains the state of each > remote ASP, in > > - each Application Server that the ASP is configured to receive > > + The SUA layer on on the SGP maintains the state of each > remote ASP, > > + in each Application Server that the ASP is configured > to receive > > traffic, as input to the SUA message distribution function. > > > > All this change did was introduce a typo: "on on". > > > > + 1 IPSP Single Exchange (SE) model. Only a single exchange of > > + ASPTM or ASPSM messages is needed to change the > IPSP state. > > + This means that a set of request from one end and > acknowledge > > + from the other will be enough. This configuration requires > > + static RK configuration. > > + > > + 2 IPSP Double Exchange (DE) model. Both IPSPs have to send > > + request messages and both IPSPs have to > acknowledge the request > > + messages from the other end. This results in a > double exchange > > + of ASPTM and ASPSM message, one from each end. This > > + configuration supports dynamic routing key > configuration by > > + using RKM messages in the same way as ASP-SGP scenario. > > > > Remove mention of RK configuration. This has not been agreed. > > > > + In order to ensure interoperability, an M3UA implementation > > + supporting IPSP communication MUST support IPSP SE > model and MAY > > + implement IPSP DE model. > > > > Change M3UA to SUA above. > > > > + * Reception of messages from the peer M3UA layer at the > ASP/IPSP; > > + * Reception of some messages from the peer M3UA layer at other > > + ASPs/IPSPs in the AS (e.g., ASP Active message indicating > > > > Change M3UA to SUA above. > > > > + ASP-DOWN: The remote M3UA peer at the ASP/IPSP is > unavailable and/or > > + the related SCTP association is down. Initially all > ASPs/IPSPs will > > + be in this state. An ASP/IPSP in this state SHOULD NOT > be sent any > > + SUA messages, with the exception of Heartbeat, ASP Down > Ack and Error > > > > Change M3UA to SUA above. > > > > + ASP-INACTIVE: The remote M3UA peer at the ASP/IPSP is > available (and > > + the related SCTP association is up) but application traffic is > > + stopped. In this state the ASP/IPSP SHOULD NOT be sent > any DATA or > > + SSNM messages for the AS for which the ASP/IPSP is inactive. > > + > > + ASP-ACTIVE: The remote M3UA peer at the ASP/IPSP is > available and > > + application traffic is active (for a particular Routing > Context or > > + set of Routing Contexts). > > > > Change M3UA to SUA above. > > > > + SCTP CDI: The SCTP CDI denotes the local SCTP layer's > Communication > > + Down Indication to the Upper Layer Protocol (M3UA) on > an SGP. The > > + local SCTP layer will send this indication when it > detects the loss > > + of connectivity to the ASP's peer SCTP layer. SCTP CDI > is understood > > + as either a SHUTDOWN_COMPLETE notification or > COMMUNICATION_LOST > > + notification from the SCTP layer. > > + > > + SCTP RI: The local SCTP layer's Restart indication to > the upper layer > > + protocol (M3UA) on an SG. The local SCTP will send > this indication > > + when it detects a restart from the ASP's/IPSP's peer > SCTP layer. > > > > You now have two SCTP CDI and SCTP RI paragraphs. Those > above and these > > below: Delete the ones above because they have M3UA instead of SUA. > > > > SCTP CDI: The SCTP CDI denotes the local SCTP layer's > Communication > > Down Indication to the Upper Layer Protocol (SUA) on an SGP. The > > local SCTP layer will send this indication when it > detects the loss > > of connectivity to the ASP's peer SCTP layer. SCTP CDI > is understood > > as either a SHUTDOWN_COMPLETE notification or COMMUNICATION_LOST > > notification from the SCTP layer. > > > > SCTP RI: The local SCTP layer's Restart indication to > the upper layer > > protocol (SUA) on an SG. The local SCTP will send this > indication > > when it detects a restart from the ASP's peer SCTP layer. > > > > The diagram now says "Other IPSP in AS Overrides". Please say > > "Other ASP/IPSP in AS Overrides". > > > > | Other +-------| | > > - | ASP in AS | +--------------+ > > + | IPSP in AS | +--------------+ > > | Overrides | ^ | > > > > 4.3.4.2 ASP Down Procedures > > > > The ASP will send an ASP Down message to an SGP when > the ASP wishes > > to be removed from service in all Application Servers > that it is a > > - member and no longer receive any DATA, SSNM or ASPTM > messages. This > > - action MAY be initiated at the ASP by an M-ASP_DOWN > request primitive > > - from Layer Management or MAY be initiated automatically > by an SUA > > - management function. > > + member and no longer receive any Connectionless or Connection - > > + Oriented, SNM or ASPTM messages. This action MAY be > initiated at the > > + ASP by an M-ASP_DOWN request primitive from Layer > Management or MAY > > + be initiated automatically by an SUA management function. > > > > Above change SNM to SSNM. > > > > When an ASP wishes to withdraw from receiving traffic > within an AS, > > - the ASP sends an ASP Inactive message to the SGP or IPSP. This > > - action MAY be initiated at the ASP by an M-ASP_INACTIVE request > > - primitive from Layer Management or MAY be initiated > automatically by > > - an SUA management function. In the case where an ASP > is processing > > - the traffic for more than one Application Server across > a common SCTP > > - association, the ASP Inactive message contains one or > more Routing > > - Contexts to indicate for which Application Servers the > ASP Inactive > > - message applies. In the case where an ASP Inactive > message does not > > - contain a Routing Context parameter, the receiver must > know, via > > - configuration data, which Application Servers the ASP > is a member and > > - move the ASP to the ASP-INACTIVE state in each all Application > > - Servers. In the case of an Override mode AS, where > another ASP has > > - already taken over the traffic within the AS with an ASP Active > > - ("Override") message, the ASP that sends the ASP > Inactive message is > > - already considered by the SGP to be in state > ASP-INACTIVE. An ASP > > - Inactive Ack message is sent to the ASP, after ensuring > that all > > - traffic is stopped to the ASP. > > + or the ASP wants to initiate the process of activation, > the ASP sends > > + an ASP Inactive message to the SGP or IPSP. > > > > Change above to "initiate the process of deactivation" > instead of "initiate > > the process of activation". > > > > Also, above you have delted the description of the ASP > Inactive procedure for > > Override mode. Please put back: > > > > - In the case where an ASP Inactive > message does not > > - contain a Routing Context parameter, the receiver must > know, via > > - configuration data, which Application Servers the ASP > is a member and > > - move the ASP to the ASP-INACTIVE state in each all Application > > - Servers. > > > > and > > > > - In the case of an Override mode AS, where > another ASP has > > - already taken over the traffic within the AS with an ASP Active > > - ("Override") message, the ASP that sends the ASP > Inactive message is > > - already considered by the SGP to be in state > ASP-INACTIVE. An ASP > > - Inactive Ack message is sent to the ASP, after ensuring > that all > > - traffic is stopped to the ASP. > > > > The following addition: > > > > +4.8 NIF Not Available on SGP > > + > > + If the SG (all the SGPs) is isolated from the NIF, then > all the users > > + are isolated from the SS7 network. A DUNA(*) message > MUST be sent > > + from the SGPs to all the ASPs. > > + > > + If only one SGP in the SG is isolated entirely from the > NIF, the SGP > > + SHOULD abort its associations. An alternative would be > for the SGP to > > + send ASP Down Ack. > > + > > + If one or more SGP suffer a partial failure (where aborting the > > + association(s) would cause all active AS(es) to fail), > then the SGP > > + MUST send DUNA messages for the affected SPC(es). This > is the case > > + where an SGP can continue to service one or more active > AS(es), but > > + due to a partial failure it is unable to service > other(s) active > > + AS(es). > > > > Please remove the entire addition. The M3UA IG has removed > this. That is > > the problem with adding stuff from the M3UA IG. The M3UA > IG has not gone > > through Last Call. > > > > + [SIGSEC] J. Loughney, M. Tuexen, J. > Pastor-Balbas, "Security > > + Considerations for SIGTRAN Protocols", Work in > > Progress. > > > > There is a Work In Progress as a normative reference. This > draft will be > > held until this reference becomes an RFC. > > > > --brian > > > > > > John Loughney wrote: (Thu, > 03 Jul 2003 19:29:23) > > > Hi all, > > > > > > I have updated SUA, I have tried to incorporate some of > the major issues > > > from the M3UA Implementation Guide. All interested > parties, please > > > give the document a quick read, because I would like to > send this to the > > > IESG for final approval. > > > > > > thanks, > > > John > > > > > > > -----Original Message----- > > > > From: ext Internet-Drafts@ietf.org > [mailto:Internet-Drafts@ietf.org] > > > > Sent: 03 July, 2003 18:33 > > > > Cc: sigtran@ietf.org > > > > Subject: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-15.txt > > > > > > > > > > > > A New Internet-Draft is available from the on-line > > > > Internet-Drafts directories. > > > > This draft is a work item of the Signaling Transport Working > > > > Group of the IETF. > > > > > > > > Title : Signalling Connection Control Part > > > > User Adaptation > > > > Layer (SUA) > > > > Author(s) : J. Loughney, G. Sidebottom > > > > Filename : draft-ietf-sigtran-sua-15.txt > > > > Pages : 118 > > > > Date : 2003-7-3 > > > > > > > > This Internet Draft defines a protocol for the transport of > > > > any Signalling Connection Control Part-User > > > > signalling over IP using the Stream Control Transport > > > > Protocol. The protocol is designed to be > > > > modular and symmetric, to allow it to work in diverse > architectures, > > > > such as a Signalling Gateway to IP Signalling Endpoint > architecture > > > > as well as a peer-to-peer IP Signalling Endpoint architecture. > > > > > > > > A URL for this Internet-Draft is: > > > > > http://www.ietf.org/internet-drafts/draft-ietf-sigtran-sua-15.txt > > > > > > > > To remove yourself from the IETF Announcement list, > send a message to > > > > ietf-announce-request with the word unsubscribe in the body > > > > of the message. > > > > > > > > Internet-Drafts are also available by anonymous FTP. Login > > > > with the username > > > > "anonymous" and a password of your e-mail address. > After logging in, > > > > type "cd internet-drafts" and then > > > > "get draft-ietf-sigtran-sua-15.txt". > > > > > > > > A list of Internet-Drafts directories can be found in > > > > http://www.ietf.org/shadow.html > > > > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > > > > > > > > > > > Internet-Drafts can also be obtained by e-mail. > > > > > > > > Send a message to: > > > > mailserv@ietf.org. > > > > In the body type: > > > > "FILE /internet-drafts/draft-ietf-sigtran-sua-15.txt". > > > > > > > > NOTE: The mail server at ietf.org can return the document in > > > > MIME-encoded form by using the "mpack" utility. > To use this > > > > feature, insert the command "ENCODING mime" > before the "FILE" > > > > command. To decode the response(s), you will > need "munpack" or > > > > a MIME-compliant mail reader. Different MIME-compliant > > > > mail readers > > > > exhibit different behavior, especially when dealing with > > > > "multipart" MIME messages (i.e. documents which > have been split > > > > up into multiple messages), so check your local > documentation on > > > > how to manipulate these messages. > > > > > > > > > > > > Below is the data which will enable a MIME compliant mail reader > > > > implementation to automatically retrieve the ASCII > version of the > > > > Internet-Draft. > > > > > > > > > > _______________________________________________ > > > Sigtran mailing list > > > Sigtran@ietf.org > > > https://www1.ietf.org/mailman/listinfo/sigtran > > > > -- > > Brian F. G. Bidulock > > bidulock@openss7.org > > http://www.openss7.org/ > > > > _______________________________________________ > > Sigtran mailing list > > Sigtran@ietf.org > > https://www1.ietf.org/mailman/listinfo/sigtran > > -- > Brian F. G. Bidulock > bidulock@openss7.org > http://www.openss7.org/ > _______________________________________________ Sigtran mailing list Sigtran@ietf.org https://www1.ietf.org/mailman/listinfo/sigtran
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… ygahlaut
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Desiderio, Didier
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Doss, James
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Zannin, Francois
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Doss, James
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Anzile, Christophe
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Anzile, Christophe
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Anzile, Christophe
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney
- RE: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… Brian F. G. Bidulock
- Re: [Sigtran] I-D ACTION:draft-ietf-sigtran-sua-1… john.loughney