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Re: [Teas] question on the topology filter draft

John E Drake <jdrake@juniper.net> Wed, 10 November 2021 14:33 UTC

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From: John E Drake <jdrake@juniper.net>
To: "EXT-vishnupavan@gmail.com" <vishnupavan@gmail.com>, Loa Andersson <loa@pi.nu>
CC: TEAS WG <teas@ietf.org>
Thread-Topic: [Teas] question on the topology filter draft
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Date: Wed, 10 Nov 2021 14:33:02 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/teas/TE1mvBg6ZtUeTHryDa3STrwqs_4>
Subject: Re: [Teas] question on the topology filter draft
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Hi,

Comment inline

Yours Irrespectively,

John



Juniper Business Use Only
From: Teas <teas-bounces@ietf.org> On Behalf Of Vishnu Pavan Beeram
Sent: Wednesday, November 10, 2021 7:23 AM
To: Loa Andersson <loa@pi.nu>
Cc: TEAS WG <teas@ietf.org>
Subject: Re: [Teas] question on the topology filter draft

[External Email. Be cautious of content]

Loa,

Please see inline (prefixed VPB)

Regards,
-Pavan


On Tue, Nov 9, 2021 at 11:57 AM Loa Andersson <loa@pi.nu<mailto:loa@pi.nu>> wrote:
WG, Pavan, authors,

I was cut off at the end of the queue in the wg discussion. I had a
fairly simple question,

Where the topology filter(s) defined

[VPB] The term "topology filter" is being introduced in draft-bestbar-teas-yang-topology-filter (not aware of any other document where it is defined). As per this data model draft, a "topology filter" is a data construct that can be applied on either a native topology or a customized topology to produce a filtered set of topological elements. The native or customized topology referred to here is a TE aware topology [RFC8795].

[JD]   https://datatracker.ietf.org/doc/html/draft-drake-bess-enhanced-vpn-06

and what benefits do we get from
using them?

[VPB] There are a couple of use-cases that are being targeted with this construct.

(a) Specification of topology related constraints for TE path computation (any setup type):
A few examples:
- Compute a path within a specific topology
- Compute a path within the topology associated with a specific IGP domain
- Compute a path within the topology learnt from a specific TE Information Source
- Compute a path within the topology defined by the application of one or more topology-filters
** Say, a topology with elements that are learnt via ISIS Level-2 and include resource-affinity red
** Or, a topology with elements associated with ISIS Flex-Algo 128 and do not include resource-affinity blue

(b) Specification of filter-topology associated with a Network Resource Partition


/Loa
--

Loa Andersson                        email: loa@pi.nu<mailto:loa@pi.nu>
Senior MPLS Expert                          loa.pi.nu@gmail.com<mailto:loa.pi.nu@gmail.com>
Bronze Dragon Consulting             phone: +46 739 81 21 64

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