Return-Path: X-Original-To: bess@ietfa.amsl.com Delivered-To: bess@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 161FA130E81; Tue, 23 Oct 2018 04:34:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.589 X-Spam-Level: X-Spam-Status: No, score=-2.589 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 03UA1MkWBwPN; Tue, 23 Oct 2018 04:34:38 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1EB1212D4EF; Tue, 23 Oct 2018 04:34:38 -0700 (PDT) Received: from LHREML712-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 84875909975FF; Tue, 23 Oct 2018 12:34:34 +0100 (IST) Received: from NKGEML411-HUB.china.huawei.com (10.98.56.70) by LHREML712-CAH.china.huawei.com (10.201.108.35) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 23 Oct 2018 12:34:34 +0100 Received: from NKGEML514-MBX.china.huawei.com ([fe80::40a8:f0d:c0f3:2ca5]) by nkgeml411-hub.china.huawei.com ([10.98.56.70]) with mapi id 14.03.0415.000; Tue, 23 Oct 2018 19:34:24 +0800 From: "Wanghaibo (Rainsword)" To: Alexander Vainshtein CC: "bess@ietf.org" , "draft-wang-bess-evpn-control-word.authors@ietf.org" Thread-Topic: A question regarding draft-wang-bess-evepn-control-word Thread-Index: AdRqrNk+JB1I7psBRa+73/QNemWcWQAALOQwAAKSsZAAAlraMA== Date: Tue, 23 Oct 2018 11:34:24 +0000 Message-ID: <1E61161D6E31D849BEA887261DB609348C770F2F@nkgeml514-mbx.china.huawei.com> References: <1E61161D6E31D849BEA887261DB609348C770DEE@nkgeml514-mbx.china.huawei.com> 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Hi Alex= ander,

&n= bsp;

The sol= ution here is to carry the next hop capability attribute when the route is = advertised. The capability carried here is the control word capability.

The spe= cific format of the next hop capability can be referred to the draft.: <draft-ietf-idr-next-hop-capability>

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | Capability Code (2 octets)   |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | Capability Length (2 octets) |<= /span>

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | Capability Value (variable)  |

  &nb= sp;            =       ~       &= nbsp;           &nbs= p;          ~

  &nb= sp;            =       +------------------------------+

For the= control word capability , it may encode as :

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | CW Capabality Type (TBD)    = ; |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | CW Length (0 or 3)     = ;      |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | CWI Label (may not exist)   &nbs= p;|

  &nb= sp;            =       +------------------------------+

CWI (Co= ntrol word indication)

&n= bsp;

And the= forwarding Packet example.

      &n= bsp;            = ;  +------------------------------+

  &nb= sp;            =       | Tunnel Label      = ;           |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | EVI Label     &nb= sp;             = ; |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | CW Indicate Label     =        |

  &nb= sp;            =       +------------------------------+

  &nb= sp;            =       | Control word     =             |

  &nb= sp;            =       +------------------------------+

&n= bsp;

The dif= ference between the two methods is that which value should be use for the c= ontrol word capability indicates label.

&n= bsp;

Method = 1, use reserved label, which should be assigned by IANA, (such as the entro= py label, which is the value of 7)

If we u= se this method, then the control word capability attribute=A1=AFs CW length= use 0 is enough.

And the= forwarding packet use the IANA specified value as the CWI (Control word in= dication) Label .(Perhaps 8 or others)

&n= bsp;

Method2= , use normal value, which is assigned by router.

If we u= se this method, then the router must assign a label used for the CWI. Perha= ps label. And the control word capability attribute=A1=AFs CW length must be 3 and must contain the value in the update message.

The for= warding packet must use that value as the CWI label.

&n= bsp;

Regards= ,

Haibo

&n= bsp;

From: Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.com]
Sent: Tuesday, October 23, 2018 6:09 PM
To: Wanghaibo (Rainsword) <rainsword.wang@huawei.com>
Cc: bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.or= g
Subject: RE: A question regarding draft-wang-bess-evepn-control-word=

 

Dear Haibo,

Lots of thanks for an extra-prompt response to my quest= ion.

 

There may be some misunderstanding here.

 

The draft says (the important text is highlighted):

 

      There are two methods t= o specified the control word indicator label:

 

      The first method is to apply= for a reserved label to indicate

      whether the packet contains = a control word;

 

      The second method is to apply for a new labe= l when the sending

      router advertises the contro= l word capability, which is used to

   &n= bsp;  indicate whether the control word is included in the packet.

 

My question referred just to the 2nd method,= while your response seems to deal with the 1st one.<= /span>

 

Did I miss something?

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302<= o:p>

Email:   Alexander.Vainshtein@ec= itele.com

 

From: BESS [mailto:bess-boun= ces@ietf.org] On Behalf Of Wanghaibo (Rainsword)
Sent: Tuesday, October 23, 2018 12:03 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draft= -wang-bess-evpn-control-word.authors@ietf.org
Cc: bess@ietf.org
Subject: [bess] =B4= =F0=B8=B4: A question regarding draft-wang-bess= -evepn-control-word

 

Hi Alex= ander,

&n= bsp;

The num= ber of routes advertised by the Sender router in our solution will not chan= ge, but only carries a next hop capability attribute with control word capability

The Rec= eiver router determines whether to carry the control word when forwarding p= ackets according to its own capabilities.

&n= bsp;

The fol= lowing figure is an example.:

PE1----= ------PE2

|-----------PE3

When PE= 1 advertises a route, it carries the next hop attribute of the control word= capability. The routes received by PE2 and PE3 are the same.

&n= bsp;

If &nbs= p;PE2 do not support the control word, it will not carry the control word w= hen forwarding packets to PE1.

PE1 can= not find the control word indication label when parsing the PE2 packet. PE1= will treat the packet as normal.

&n= bsp;

If &nbs= p;PE3 support the control word, it can add a control word when forwarding t= he packet to the PE1, and add the control word indication label specified by the PE1.

When th= e PE1 receives the packet and finds the control word indication label in th= e packet. PE1 will correctly process the control word.

&n= bsp;

Thanks<= o:p>

Haibo

&n= bsp;

=B7=A2=BC=FE=C8=CB:= Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.com]
=B7=A2=CB=CD=CA=B1=BC=E4:= 2018=C4=EA10=D4=C223=C8=D5 16:46
=CA=D5=BC=FE=C8=CB: draft-wang-bess-evpn-control-word.authors@ietf.org
=B3=AD=CB=CD: bess@ietf.org
=D6=F7=CC=E2: A question regarding draft-wang-bess-evepn-control-word=

 

Dear authors of draft-wang-bess-evpn-control-word,

I have doubts regarding at leas= t one of the approaches for negotiating the CW usage in the EVPN encapsulat= ion between egress and ingress PE that is defined in the draft.<= /span>

 

In the case when the egress PE = can receive EVPN-encapsulated packets both with and without CW, the draft s= eems to propose (as one of the possibilities) advertisement of two EVPN rou= tes for each ES or MAC/IP pair:

-  = ;        One of these routes wou= ld use the CW Capability to indicate that it refers to the EVPN encapsulati= on that uses the CW, and would carry the appropriate label in its NLRI=

-  = ;        The other route would n= ot use the CW Capability to indicate that it refers to the EVPN encapsulati= on that does not use the CW, and carry a different label in its NLRI

 

The ingress PE that accepts the= se routes would then use one of them based on its own ability to use the CW= (or lack thereof), and use the corresponding label it its EVPN encapsulati= on, while  the DP in the egress PW would infer presence or absence of the CW from the received EVPN application lab= el.

 

Unfortunately, I do not think t= hat this can work because, as per RFC 7432, labels in the= labeled NLRI of EVPN routes are not part of the route key for the purpose = of the BGP route key processing, while the label is treated just as the BGP= attribute. This means that, unless some form of BGP multi-path is enabled in the ingress PE (and in all RRs o= n the way between the egress PE and ingress PE) for the L2VPN/EVPN  AF= I/SAFI, only one of these routes will be selected by the BGP selection proc= ess.

 

Did I miss something substantia= l here?

 

Regards, and lots of thanks in = advance,

Sasha

 

Office: +972-39266302<= /o:p>

Cell:    &n= bsp; +972-549266302

Email:   Alexander.Vainshtein@ecitele.com

 


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