Subject: IBM 6611 and RFC 1434

From: "R. C. (Roy) Dixon" <[email-masked]>
Date: Thu, 2 Dec 93 07:29:04 EST

Reference: My note dated 1 November 93

It has been brought to my attention that my note contained an error.

Under the last section on State Table Updates, the first note should
read, "The receipt of an XID will cause a CANUREACH message to be
sent," not an ICANREACH message.

Regards, Roy

---

From: Bernard Brady <[email-masked]>
Date: Fri, 3 Dec 93 09:20:51 EDT

>Received: from ibmstandards.cary.ibm.com by BBN.COM id aa23709;
>          2 Dec 93 9:36 EST
>Received: by ibmstandards.cary.ibm.com (5.61-AIX-1.2/1.0) from [192.239.48.4] with SMTP
>	id AA185183; Thu, 2 Dec 93 07:19:47 -0500
>Message-Id: <[email-masked]>
>Received: from RALVMG by vnet.IBM.COM (IBM VM SMTP V2R2) with BSMTP id 6878;
>   Thu, 02 Dec 93 07:30:27 EST
>Date: Thu, 2 Dec 93 07:29:04 EST
>From: "R. C. (Roy) Dixon" <[email-masked]>
>X-Addr: (919) 543-3380       Tieline:  441-3380
>        (919) 254-7184       Tieline:  444-7184
>        Internet:  [email-masked]
>        Dept. B57, Bldg. 060, IBM Corporation
>        P.O. Box 12195, RTP, N.C. 27709
>To: [email-masked]
>Subject: IBM 6611 and RFC 1434
>

Roy,

I have the following questions?

1)	In developing the FSM for the DLSw target I have made the
assumption that if I receive a CONTACT, XIDFRAME, or DGRMFRAME. that
this is an implied REACH_ACK.  I reasoned this from the following
paragraph on page 9 of the RFC.

      If the REACH_ACK message is not successfully received, the target
      Data Link Switch can obtain the Origin Circuit ID from a
      subsequent message (i.e., CONTACT, XIDFRAME, or DGRMFRAME).

Is this a valid assumption?

2)	While in the CIRCUIT PENDING State the RFC Page 25 shows that if
a DLC_XID event is encountered then the  DLSw action should send a
XIDFRAME.  I disagree with this in that you do not have the ORIGIN
CIRCUIT ID yet.  I think that the XID should be queued until the REACH
ACK is recevied.  Once the REACH_ACK / ORIGIN ID is received then the
XIDFRAME should be sent.

Regards, Bernie