Jorge, Thanks for your explanations. However, i still can't understand, i'm sorry.
RFC 5512 only defines IP tunnel type and encapsulation attribute, like L2TPv3,GRE and IP in IP. For RFC 5512, MPLS tunnel doesn't need to be defined specifically, it is default case. In RFC 7432, the tunnel type 10 also hasn't been defined. Later, when the EVPN for overlay network solution was proposed, the tunnel type 10 was introduced to differentiate MPLS tunnel and VXLAN/NVGRE/MPLS Over GRE tunnel, because same route type 1,2,3,4 and 5 are used in both RFC 7432 and the draft 'draft-ietf-bess-evpn-overlay-02'. We need the tunnel type to clearly notify peer EVPN PE which tunnel(including MPLS tunnel type) should be used. So it introduced updates on RFC 7432 and will incur some interoperbility issue for RFC 7432. Am i right? Thanks, weiguo ________________________________ From: BESS [bess-boun...@ietf.org] on behalf of Rabadan, Jorge (Jorge) [jorge.raba...@alcatel-lucent.com] Sent: Wednesday, November 11, 2015 0:01 To: Haoweiguo; saja...@cisco.com; jdr...@juniper.net Cc: bess@ietf.org Subject: Re: [bess] One question about 'draft-ietf-bess-evpn-overlay-02' Weiguo, There are already implementations using value 10 in the RFC5512 BGP encap ext community. That is the value you would have in RFC7432 compliant networks where you can also have overlay tunnels. Value 10 would indicate to the ingress PE that the route needs an MPLS tunnel to be resolved. Thx Jorge From: BESS <bess-boun...@ietf.org<mailto:bess-boun...@ietf.org>> on behalf of Haoweiguo <haowei...@huawei.com<mailto:haowei...@huawei.com>> Date: Tuesday, November 10, 2015 at 1:05 AM To: "saja...@cisco.com<mailto:saja...@cisco.com>" <saja...@cisco.com<mailto:saja...@cisco.com>>, "jdr...@juniper.net<mailto:jdr...@juniper.net>" <jdr...@juniper.net<mailto:jdr...@juniper.net>> Cc: "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.org>> Subject: [bess] One question about 'draft-ietf-bess-evpn-overlay-02' Hi Ali & John, The draft of 'draft-ietf-bess-evpn-overlay-02' describes how EVPN can be used for Overlay network, the overlay network includes VXLAN, NVGRE and MPLS Over GRE. In section 13 IANA considerations, several overlay tunnel types are requested as follows: 8 VXLAN Encapsulation 9 NVGRE Encapsulation 10 MPLS Encapsulation (?) 11 MPLS in GRE Encapsulation 12 VXLAN GPE Encapsulation IMO, 8,9,11 and 12 are all overlay encapsulations, 10 is an exception. Would you like to explain what's the purpose of tunnel type 10? Thanks, weiguo
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