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Re: CRH and RH0

Stewart Bryant <stewart.bryant@gmail.com> Thu, 14 May 2020 13:10 UTC

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Subject: Re: CRH and RH0
Date: Thu, 14 May 2020 14:10:45 +0100
In-Reply-To: <CAOj+MMEiHBANcMZD0JjPtk7sbT5NS0Q7Rdg6vrbQrV88pBWPZg@mail.gmail.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>, Ronald Bonica <rbonica@juniper.net>, 6man <6man@ietf.org>, Bob Hinden <bob.hinden@gmail.com>, "Darren Dukes (ddukes)" <ddukes=40cisco.com@dmarc.ietf.org>
To: Robert Raszuk <robert@raszuk.net>
References: <4EDFE9A2-A69C-4434-BB0A-960C2453250F@cisco.com> <DM6PR05MB6348FE6E3A45320C2A47EB66AEBE0@DM6PR05MB6348.namprd05.prod.outlook.com> <8068EBE1-38DD-411E-A896-EB79084BBCC4@cisco.com> <DM6PR05MB6348326B0F72A009DB4F7746AEBE0@DM6PR05MB6348.namprd05.prod.outlook.com> <942AF8C7-079E-4C81-95AB-F07A182E8F19@employees.org> <DM6PR05MB63483621F4AD3DEACA6FAF35AEBE0@DM6PR05MB6348.namprd05.prod.outlook.com> <6F11579E-0F8A-48EB-86EC-945E17C11BF4@employees.org> <DM6PR05MB6348345A76F32CE07392AA58AEBE0@DM6PR05MB6348.namprd05.prod.outlook.com> <3C800B54-6E3B-483A-8FA0-50075043DFD1@employees.org> <DM6PR05MB63480871BD73F8D35A3D501AAEBE0@DM6PR05MB6348.namprd05.prod.outlook.com> <E800E9A3-C05B-41E0-B752-3E0D067BDBE5@gmail.com> <DM6PR05MB63489AD43E07A2CDED86E274AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAOj+MMHGyn8-QJJbsL9=wYdzNeE8UPSHMjcwhvCMyx=AsuF4AA@mail.gmail.com> <DM6PR05MB63481EC429A8A02E0064B3E5AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAOj+MMF15aT7YBR-rqvqpjF=HXqyKPhVSOjHbS_X4sZV8s9bEg@mail.gmail.com> <DM6PR05MB6348B730373B31CFBFDB63F5AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <DM6PR05MB6348B0741DBA105DD5FC86F7AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAOj+MMECij9zaeojwjBjQeZMCTMV5q4avn76yPcC+6b0m_gXbA@mail.gmail.com> <87E3E8BB-1126-4472-A59A-FE8B82AE6C6B@gmail.com> <DM6PR05MB6348E9AD1E088792C2F10BB4AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAMGpriWmk-cCgjSqnj0OWheKLcUBXY20HYRp2FKAH=6K9rEvzg@mail.gmail.com> <DM6PR05MB6348C224B6DA84D593D6E898AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAO42Z2yhg4BZaeHtVNGza8LBxHt2bkgFu8OKBCaB3NDRV2sRWw@mail.gmail.com> <CAOj+MMGGJEPT97CdYu=HQkjAbbZ99d-kF15z24_OUh_x-qa7jw@mail.gmail.com> <DM6PR05MB63480C7408A18249301573D0AEBF0@DM6PR05MB6348.namprd05.prod.outlook.com> <DDCEA175-6842-440F-9651-2D81FF4EBF72@cisco.com> <DM6PR05MB63482030E05B439E677BF70AAEBC0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAOj+MMEiHBANcMZD0JjPtk7sbT5NS0Q7Rdg6vrbQrV88pBWPZg@mail.gmail.com>
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> On 14 May 2020, at 13:39, Robert Raszuk <robert@raszuk.net> wrote:
> 
> The CRH can be used within any network where:
> 
> All nodes can maintain a CRH-FIB that maps SIDs to IPv6 addresses and forwarding methods
> Can you confirm that if I have at least one node which can not maintain CRH-FIB CRH can not be used in the entire network ? To me that is sever limitation and deployment blocker. Are you saying that legacy node - pure IPv6 transit - can not just forward based on the DA address and must always inspect CRH ?

How could *all* ever be the case? Surely it is the same as SRv6 in that nodes that do not understand the EH just forward the packet on the best effort path, and nodes instantiating the path need to take that into consideration.

Stewart

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