Re: [Idr] [bess] One question about 'draft-ietf-bess-evpn-overlay-02' and draft-ietf-idr-tunnel-encaps-00

Hi Lucy,

Did you take time to read
https://tools.ietf.org/html/draft-ietf-bess-evpn-overlay-02

Its used pretty intense by DC orchestration platforms nowadays. Section 5.1
provides more insight.
Brgds, G/

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On Fri, Nov 13, 2015 at 7:12 PM, Lucy yong < lucy.yong@huawei.com 
[lucy.yong@huawei.com] > wrote:
Hi John,

Since the tunnel encap draft goes with encap tunnel attribute and there was 
no
deployment of RFC5512, IMO, we should deprecate encapsulation extended 
community
to keep a consistent method.

Thus, should the overlay draft states if BGP tunnel encapsulate attribute 
is not
present, ....

Regards,
Lucy

-----Original Message-----
 From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of 
thomas.morin@orange.com
Sent: Friday, November 13, 2015 10:46 AM
To: John E Drake; bess@ietf.org
Cc: IDR; Ali Sajassi (sajassi); Eric Rosen
Subject: Re: [bess] One question about 'draft-ietf-bess-evpn-overlay-02' 
and
draft-ietf-idr-tunnel-encaps-00

John,

(Cc'ing IDR.)

2015-11-13, John E Drake:
 >
 > I spoke with Eric and Ali and we would like to change both the overlay
 > draft and the tunnel encaps drafts as follows.
 >
 > For the overlay draft, replace this text in section 5.1.3:
 >
 > "If the BGP Encapsulation extended community is not present, then
 > thedefault MPLS encapsulation or a statically configured encapsulation
 > is
 > assumed."
 >
 > With the following:
 >
 > "Note that the MPLS encapsulation tunnel type is needed in order to
 > distinguish between an advertising node that only supports non-MPLS
 > encapsulations and one that supports MPLS and non-MPLS encapsulations.
 > An advertising node that only supports MPLS encapsulation does not
 > need to advertise any encapsulation tunnel types; i.e., if the BGP
 > Encapsulation extended community is not present, then either MPLS
 > encapsulation or a statically configured encapsulation is assumed."

Having more text to explain things in the overlay draft does not hurt.

 >
 > For the tunnel encaps draft, replace this text in section 5:
 >
 > "If the Tunnel Encapsulation attribute contains several TLVs (i.e.,
 > ifit specifies several tunnels), router R may choose any one of those
 > tunnels, based upon local policy. If any of tunnels' TLVs contain the > 
Color
sub-TLV and/or the Protocol Type sub-TLV defined in [RFC5512], the
 > choice of tunnel may be influenced by these sub-TLVs."
 >
 > With the following:
 >
 > "If the Tunnel Encapsulation attribute contains several TLVs (i.e.,
 > ifit specifies several tunnels), router R may choose any one of those
 > tunnels, based upon local policy. If any of tunnels' TLVs contain the
 > Color sub-TLV and/or the Protocol Type sub-TLV defined in [RFC5512],
 > the choice of tunnel may be influenced by these sub-TLVs. Note that if
 > none of the TLVs specifies the MPLS tunnel type, a Label Switched Path
 > SHOULD NOT be used unless none of the TLVs specifies a feasible tunnel."

I think that the above will technically work.

*However* it would be a pity to *not* have the very useful clear-text
explanation of the reason for the 'MPLS' type (what you propose to add 
above in
the overlay draft) in draft-ietf-idr-tunnel-encaps-00... why provide the 
smooth
explanation for only one of the specs to which this 'MPLS' type applies ?

 >
 > We hope this is satisfactory.

Close, but not quite there yet :)

Best,

-Thomas

 >
 >> -----Original Message-----
 >> From: Thomas Morin [mailto:thomas.morin@orange.com]
 >> Sent: Thursday, November 12, 2015 10:08 AM
 >> To: John E Drake; bess@ietf.org
 >> Cc: Eric Rosen
 >> Subject: Re: [bess] One question about 
'draft-ietf-bess-evpn-overlay-02'
 >>
 >> Hi John,
 >>
 >> 2015-11-12, John E Drake:
 >>>
 >>> Why do you think it should be documented in Eric's draft rather than
 >>> in the
 >> EVPN Overlay draft?
 >>
 >> The issue applies beyond the context of E-VPN overlay specs, and
 >> exist in any context where different kinds of MPLS(/x) encaps can be
 >> mixed (E-VPN non-overlay, IP VPNs), which is addressed by Eric's draft.
 >>
 >> Best,
 >>
 >> -Thomas
 >

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