Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls-residence-time-14: (with DISCUSS and COMMENT)
Alia Atlas <akatlas@gmail.com> Thu, 02 March 2017 14:48 UTC
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From: Alia Atlas <akatlas@gmail.com>
Date: Thu, 02 Mar 2017 09:48:46 -0500
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To: Greg Mirsky <gregimirsky@gmail.com>
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Cc: mpls-chairs@ietf.org, draft-ietf-mpls-residence-time@ietf.org, "mpls@ietf.org" <mpls@ietf.org>, The IESG <iesg@ietf.org>
Subject: Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls-residence-time-14: (with DISCUSS and COMMENT)
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Hi Greg, On Thu, Mar 2, 2017 at 2:01 AM, Greg Mirsky <gregimirsky@gmail.com> wrote: > Hi Alia, > thank you for your thorough review and the comments. Please find my > responses in-line tagged GIM>>. > > Regards, > Greg > > On Wed, Mar 1, 2017 at 3:05 PM, Alia Atlas <akatlas@gmail.com> wrote: > >> Alia Atlas has entered the following ballot position for >> draft-ietf-mpls-residence-time-14: Discuss >> >> When responding, please keep the subject line intact and reply to all >> email addresses included in the To and CC lines. (Feel free to cut this >> introductory paragraph, however.) >> >> >> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >> for more information about IESG DISCUSS and COMMENT positions. >> >> >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-mpls-residence-time/ >> >> >> >> ---------------------------------------------------------------------- >> DISCUSS: >> ---------------------------------------------------------------------- >> >> Thank you for a clear document. I think that this should be a >> straightforward Discuss to better clarify. >> >> In Section 4.8.1, it says "The RTM Set sub-object contains an ordered >> list, from egress node to >> ingress node, of the RTM capable nodes along the LSP's path." but the >> sub-TLVs (as most clearly >> indicated by "4.8.1.3. Unnumbered Interface Sub-TLV" are actually meant >> to be a list of interfaces. >> > GIM>> I think that the text, e.g. by stating "The Length is always 12" and > the Figure 10 are clear that only one interface can be listed in the > sub-TLV. > And the same is true for other sub-TLVs. > The draft says"Only a single RTM_SET sub-TLV with the given Value field MUST be present in the RTM_SET TLV. If more than one sub-TLV is found the LSP setup MUST fail" There is nothing there that clearly states that only one of the 3 sub-TLVs should be place in the RTM_SET TLV for a particular node. There is also the inaccuracy between putting in interface addresses versus the claim that it contains nodes. For instance, text could be added/changed to indicate: "The RTM_SET TLV is intended to include the subset of the RRO Object that represents those egress interfaces on the LSP that are RTM-capable. After a node chooses an egress interface to use in the RRO sub-TLV, that same egress interface, if RTM-capable, SHOULD be placed into the RTM_SET TLV using one of the IPv4 sub-TLV, IPv6 sub-TLV, or Unnumbered Interface sub-TLV. The address family chosen SHOULD match that of the RESV message and that used in the RRO; the unnumbered interface sub-TLV is used when the egress interface has no assigned IP address. A node MUST NOT place more sub-TLVs in the RTM_SET TLV than the number of RTM-capable egress interfaces the LSP traverses that are under that node's control." It isn't clear whether these are supposed to be the egress interface, the >> ingress interface, or just any >> interface > > GIM>> In order for the process described in section 4.8 to work RTM node > MUST use the same ID in RTM_SET sub-TLV as in RRO subobject. > Right - but I don't see the draft saying that clearly. See my suggested text above. > - or why sending just a Router ID wouldn't be sufficient. >> There is no indication as to whether >> it is ok to include both the IPv4 and IPv6 address Sub-TLVs for the same >> node or how to select which one >> to use. >> > GIM>> Selection should follow election of ID for corresponding subobject > in RRO. > Agreed - see suggested text. > >> ---------------------------------------------------------------------- >> COMMENT: >> ---------------------------------------------------------------------- >> >> 1) I am disappointed that the sub-TLV needed for an OSPFv3 Extended LSA >> isn't defined. While I understand that a normative reference isn't >> desirable - instead of "left for future study", it would be better to say >> that the sub-TLV should use the same format as in Sec 4.3 and that the >> type allocation and full details are left to a future document. This is >> exactly how gaps are created for networks running only IPv6. If >> draft-ietf-ospf-ospfv3-lsa-extend-13 were not waiting for implementations >> and had a clear time-frame for how and when to progress, this would also >> be a Discuss. >> > GIM>> I agree that your proposal narrows the gap for IPv6 extension for > RTM capability advertisement. Will apply the text you've suggested in the > next version. Hope OSPF WG agrees to this change. > Thanks. Regards, Alia
- [mpls] Alia Atlas' Discuss on draft-ietf-mpls-res… Alia Atlas
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Greg Mirsky
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Alia Atlas
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Greg Mirsky
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Alia Atlas
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Greg Mirsky
- Re: [mpls] Alia Atlas' Discuss on draft-ietf-mpls… Greg Mirsky