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

Hi Gunter,

Thank you to point to the right section. This overlay draft suggests to use Encapsulation extended community to indicate the type of data plane encapsulation to be used for all EVC routes. But the tunnel encap draft proposes to use tunnel encapsulation attribute + sub-TLVs to indicate the type of data plane encapsulation to be used for a prefix. Why do we want to have two solutions for the same space?

Since this overlay draft is not RFC yet, it is good for the community to make a decision on it, which keeps simple for the implementation. It is not hard to modify the draft to use tunnel encapsulation attribute indicating the type of data plane encapsulation for all EVC routes.

Regards,
Lucy

From: Gunter Van De Velde [mailto:guntervandeveldecc@icloud.com]
Sent: Friday, November 13, 2015 1:46 PM
To: Lucy yong
Cc: thomas.morin@orange.com; John E Drake; bess@ietf.org; IDR; Ali Sajassi (sajassi)
Subject: 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<mailto: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<mailto:thomas.morin@orange.com>
Sent: Friday, November 13, 2015 10:46 AM
To: John E Drake; bess@ietf.org<mailto: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<mailto: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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