Re: [Idr] Can one Destination Address appear in both Tunnel Encap Attribute and in MP_REACH_NLRI ?
Robert Raszuk <robert@raszuk.net> Thu, 17 October 2019 07:47 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 17 Oct 2019 09:47:12 +0200
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To: Srihari Sangli <ssangli=40juniper.net@dmarc.ietf.org>
Cc: Linda Dunbar <linda.dunbar@futurewei.com>, "idr@ietf.org" <idr@ietf.org>, "draft-ietf-idr-tunnel-encaps@ietf.org" <draft-ietf-idr-tunnel-encaps@ietf.org>
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Subject: Re: [Idr] Can one Destination Address appear in both Tunnel Encap Attribute and in MP_REACH_NLRI ?
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Hey Srihari, > The presence of Tunnel Encapsulation attribute in an update that carries MP_REACH > attribute indicates the data path destined for prefixes encoded in the NLRI field of MP_REACH. My reading of Linda's point was a question regarding the case where for prefix A NLRI points to next hop NH_1 but tunnel endpoint says go to NH_2. Is such update still valid ? Has tunnel encapsulation attribute power to "overrule" BGP next hop from MP_REACH ? When BGP best path runs and validates NH_1 is basic next hop validation also performed on NH_2 before considering this path as valid ? When BGP selects such path as best and installs it to RIB does it install it with NH_1 or NH_2 ? Note that both next hops may be reachable via local IGP or even going further could be recursive via yet more BGP routes. Many thx, Robert. If a Destination address is already listed in the MP_RACH_NLRI, is it > listed again in the Tunnel Encap subTLV (if it can be reached via some > tunnel, such as VxLAN/GRE/? > > > > I’m not clear what you mean here. The MP_REACH provides the reachability > information while the Tunnel Encapsulation Attribute provides the Tunnel > details (remote-endpoint, encapsulation, etc). The presence of Tunnel > Encapsulation attribute in an update that carries MP_REACH attribute > indicates the data path destined for prefixes encoded in the NLRI field of > MP_REACH. > > > > Thanks. > > srihari… >
- [Idr] Can one Destination Address appear in both … Linda Dunbar
- Re: [Idr] Can one Destination Address appear in b… Srihari Sangli
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk
- Re: [Idr] Can one Destination Address appear in b… Srihari Sangli
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk
- Re: [Idr] Can one Destination Address appear in b… Ondrej Zajicek
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk
- Re: [Idr] Can one Destination Address appear in b… Rajiv Asati (rajiva)
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk
- Re: [Idr] Can one Destination Address appear in b… Keyur Patel
- Re: [Idr] Can one Destination Address appear in b… Keyur Patel
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk
- Re: [Idr] Can one Destination Address appear in b… Keyur Patel
- Re: [Idr] Can one Destination Address appear in b… Linda Dunbar
- Re: [Idr] Can one Destination Address appear in b… Robert Raszuk