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Re: [netmod] rfc6991bis: loopback addresses

"Acee Lindem (acee)" <acee@cisco.com> Fri, 31 July 2020 10:22 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Qin Wu <bill.wu@huawei.com>, Kent Watsen <kent@watsen.net>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] rfc6991bis: loopback addresses
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Date: Fri, 31 Jul 2020 10:21:59 +0000
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Subject: Re: [netmod] rfc6991bis: loopback addresses
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Hi Qin, 

On 7/30/20, 9:23 PM, "Qin Wu" <bill.wu@huawei.com> wrote:

    -----邮件原件-----
    发件人: netmod [mailto:netmod-bounces@ietf.org] 代表 Acee Lindem (acee)
    发送时间: 2020年7月31日 5:06
    收件人: Kent Watsen <kent@watsen.net>; Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
    抄送: Carlos Pignataro (cpignata) <cpignata@cisco.com>; netmod@ietf.org
    主题: Re: [netmod] rfc6991bis: loopback addresses

    Hi Kent,

    On 7/30/20, 4:55 PM, "netmod on behalf of Kent Watsen" <netmod-bounces@ietf.org on behalf of kent@watsen.net> wrote:


        > Thanks for pointing to the definitions in draft-nainar-mpls-lsp-ping-yang.
        > With that, your request is relatively clear now

        Looking at draft-nainar-mpls-lsp-ping-yang, the proposal is a “typedef” that constrains inet:ipv[46]-address so that it can only contain loopback address values.


        > and the question the WG
        > needs to answer is whether these types are common enough to warrant being
        > part of inet-types, i.e., are there any other places where these types
        > may be useful?

        I don’t think so, but I’m not a routing person.

    I wouldn't think that an internal loopback address would be widely used. In fact, I checked our Cisco native models for IOS-XE and there is no such definition. 

    [Qin]: I am not sure we are talking about loopback type or loopback address
    See section 2.4 in draft-ietf-netmod-intf-ext-yang-10, 3 type loopbacks are defined:
    1.Internal loopback
    2.Line loopback
    3.Loopback Connector
    3 types loopback can be classified into local loopback and remote loopback.
    I am not sure they are common, but we have some support for this. 

This is the loopback address type - not the loopback interface type. Look at draft-nainar-mpls-lsp-ping-yang (the draft being discussed in the Email thread). 

Thanks,
Acee

    Thanks,
    Acee


        > /js

        K.  // contributor
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