Re: [Idr] Few questions about Segment Routing extensions for BGP LS (draft-ietf-idr-bgp-ls-segment-routing-ext)
"Wanghaibo (Rainsword)" <rainsword.wang@huawei.com> Thu, 22 July 2021 08:12 UTC
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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
To: Boris Hassanov <bhassanov=40yahoo.com@dmarc.ietf.org>, IDR List <idr@ietf.org>
Thread-Topic: [Idr] Few questions about Segment Routing extensions for BGP LS (draft-ietf-idr-bgp-ls-segment-routing-ext)
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Date: Thu, 22 Jul 2021 08:12:20 +0000
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Subject: Re: [Idr] Few questions about Segment Routing extensions for BGP LS (draft-ietf-idr-bgp-ls-segment-routing-ext)
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Hi Boris, 2) draft-ietf-idr-bgp-ls-segment-routing-ext-18 has two types of labels TLV: SID/Label TLV type 1161 and Prefix SID TLV type 1158. I checked several vendors implementations of BGP-LS, all of them use only Prefix SID TLV. BGP-LS information come from ISIS or OSPF. The Prefix-SID can indicate a node. But there is no separate Node-SID defined now. Regards, Haibo From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Boris Hassanov Sent: Wednesday, July 21, 2021 5:55 PM To: IDR List <idr@ietf.org> Subject: [Idr] Few questions about Segment Routing extensions for BGP LS (draft-ietf-idr-bgp-ls-segment-routing-ext) Hi all, 1) Need an advice, I might be missing something but I see that Anycasi SID (3333 in the example below) is in BGP-LS update as regular Prefix SID TLV: Path Attribute - BGP-LS Attribute Flags: 0x80, Optional, Non-transitive, Complete 1... .... = Optional: Set .0.. .... = Transitive: Not set ..0. .... = Partial: Not set ...0 .... = Extended-Length: Not set .... 0000 = Unused: 0x0 Type Code: BGP-LS Attribute (29) Length: 12 Link State Prefix SID TLV Type: 1158 Length: 8 Flags: 0x40, Node-SID (N) 0... .... = Re-advertisement (R): Not set .1.. .... = Node-SID (N): Set ..0. .... = No-PHP (P): Not set ...0 .... = Explicit-Null (E): Not set .... 0... = Value (V): Not set .... .0.. = Local (L): Not set Algorithm: 0 SID/Index: 3333 Here is confusion, how, let's say, a controller, which receives such BGP-LS update, could distinguish it from regular Prefix/Node SID? Unfortunately draft-ietf-idr-bgp-ls-segment-routing-ext-18 does not clarify this issue because it only describes Prefix SID TLV type 1158. Any suggestions? 2) draft-ietf-idr-bgp-ls-segment-routing-ext-18 has two types of labels TLV: SID/Label TLV type 1161 and Prefix SID TLV type 1158. I checked several vendors implementations of BGP-LS, all of them use only Prefix SID TLV. Why the draft does not have some conditions or clarifications when to use SID/Label TLV and when Prefix SID TLV? Thank you. SY, Boris
- [Idr] Few questions about Segment Routing extensi… Boris Hassanov
- Re: [Idr] Few questions about Segment Routing ext… Robert Raszuk
- Re: [Idr] Few questions about Segment Routing ext… Boris Hassanov
- Re: [Idr] Few questions about Segment Routing ext… Robert Raszuk
- Re: [Idr] Few questions about Segment Routing ext… Jeff Tantsura
- Re: [Idr] Few questions about Segment Routing ext… Wanghaibo (Rainsword)
- Re: [Idr] Few questions about Segment Routing ext… Ketan Talaulikar (ketant)
- Re: [Idr] Few questions about Segment Routing ext… Boris Hassanov
- Re: [Idr] Few questions about Segment Routing ext… Ketan Talaulikar (ketant)