Re: [bess] A question about Tunnel Identifier in PMSI Tunnel Attribute etc.
Hiroshi Tsunoda <tsuno@m.ieice.org> Sat, 12 August 2017 08:04 UTC
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From: Hiroshi Tsunoda <tsuno@m.ieice.org>
Date: Sat, 12 Aug 2017 10:03:20 +0200
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To: Thomas Morin <thomas.morin@orange.com>
Cc: "bess@ietf.org" <bess@ietf.org>, Glenn Mansfield Keeni <glenn@cysols.com>
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Subject: Re: [bess] A question about Tunnel Identifier in PMSI Tunnel Attribute etc.
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Hi Thomas, Thank you very much for your answer. It is really helpful for me. I am going to update the draft taking into account your answer. Best regards, -- tsuno 2017-08-11 16:50 GMT+02:00 Thomas Morin <thomas.morin@orange.com>: > Hi Tsuno, > > (below) > > Hiroshi Tsunoda, 2017-08-08 22:20: >> >> a) Format and examples of Tunnel Identifier in PMSI Tunnel Attribute >> >> L2L3-VPN-MCAST-TC-MIB provides a textual convention >> (L2L3VpnMcastProviderTunnelId) representing >> the Tunnel Identifier of a P-tunnel. >> >> a-1) I would like to know if there is any preferred format >> when a Tunnel Identifier is printed. > > For each different type, there is a natural/preferred format, but > there is no format valid across all different types. > > When the type is for IP multicast tree, it would be natural to display > it as an IP adress, but when the type is for an LSP, it depends on the > MPLS signaling protocol (mLDP, P2MP RSVP-TE)... > > I don't know if there is a better solution than to display a > hexadecimal byte string. > >> a-2) In the case that there is no preferred format, >> the MIB doctor request us to show some actual >> examples of the Tunnel Identifier. >> Is there any good reference to see the actual examples? > > Not as far as I know. > I don't think there is any canonical way to display, e.g. the <Extended > Tunnel ID, Reserved, Tunnel ID, P2MP ID> tuple of an RSVP-TE P2MP LSP > SESSION Object. > >> >> b) Required information to identify a particular P-tunnel >> >> l2L3VpnMcastPmsiTunnelAttributeTable defined in L2L3-VPN-MCAST- >> MIB >> is a table to provide P-tunnel information. >> Currently the index of this table is composed of >> information objects representing Flags, Tunnel Type, >> MPLS Label, and Tunnel Indentifier in >> delivered in PMSI Tunnel Attribute. >> I think the index must be composed only of minimal >> objects to identify a particular P-tunnel. >> Thus, Tunnel Type and Tunnel Indentifier are required >> for the index as described in Sec. 7.4.1.1 of RFC6513, >> but Flags is not required. >> >> b-1) How about MPLS Label? Is it required to be included in the >> index? > > Doing lookups in this table based on an MPLS label does not look like > something natural to do, given that the label allocated may change over > time. I would be tempted to answer no to your question. > > -Thomas > > > >> 2017-07-09 14:11 GMT+02:00 Glenn Mansfield Keeni <glenn@cysols.com>: >> > L2L3-VPN-MCAST-TC-MIB is almost OK. >> > smilint gives warnings >> > (snip) >> > L2L3-VPN-MCAST-TC-MIB:112: [5] {type-without-format} warning: >> > type >> > `L2L3VpnMcastProviderTunnelId' has no format specification >> > This may be avoided by specifying a format in which the >> > L2L3VpnMcastProviderTunnelId should be printed. >> > Is there a preferred format? How will this be printed? >> > One continuous octet string? >> > >> > (snip) >> > >> > But before we go on to the next stage could you please confirm that >> > A. The l2L3VpnMcastPmsiTunnelAttributeTable needs all of the >> > following >> > four MOs as index for its rows >> > l2L3VpnMcastPmsiTunnelAttributeFlags, >> > l2L3VpnMcastPmsiTunnelAttributeType, >> > l2L3VpnMcastPmsiTunnelAttributeLabel, >> > l2L3VpnMcastPmsiTunnelAttributeId >> > The l2L3VpnMcastPmsiTunnelAttributeId by itself is inadequate? >> > If yes >> > please explain it to me. Or point to the text that contains the >> > explanation. >> > I have been unable to confirm the above from the draft - that is >> > very >> > likely due to my lack of understanding of the l2L3VpnMcast >> > technology. >> >> _______________________________________________ >> BESS mailing list >> BESS@ietf.org >> https://www.ietf.org/mailman/listinfo/bess
- [bess] A question about Tunnel Identifier in PMSI… Hiroshi Tsunoda
- Re: [bess] A question about Tunnel Identifier in … Thomas Morin
- Re: [bess] A question about Tunnel Identifier in … Hiroshi Tsunoda