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Tim,

Lots of thanks for sharing your views.

 

Unfortunately, I doubt the approach that you propose: always use or = do not use CW in the same EVI.

 

The problem, as I see it is that known unicast and BUM traffic may b= e handled differently when it comes to EVPN encapsulation:

1.       Section 18 of RFC 7432 explicitly s= tates that =A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or= P2P LSP, then the control word SHOULD NOT be used=A1=B1

a.       This recommendation is quite reason= able because the LSPs in question are not affected by ECMP, so there is no= need to use the CW to prevent ECMP-cause reordering

b.       It is quite possible to P2MP LSPs=20= as the P-tunneling technology delivery of BUM traffic in EVPN while using = MP2P LSPs for carrying known unicast traffic

c.       The bottom line: RFC 7432 defines the =  scenario when the CW SHOULD be used in the EVPN encapsulation of the known unicast traffic but SHOULD NOT be used in= the EVPN encapsulation of BUM traffic as valid

2.       I am aware (this information is pub= licly available) of at least one deployed EVPN implementation that:

a.       By default includes the CW in the E= VPN encapsulation of known unicast traffic (this default behavior can be d= isabled by explicit configuration)

b.       Does not include the CW in the EVPN= encapsulation of BUM traffic, presumably due to limitations imposed by th= e forwarding HW.

c.       The bottom line: inconsistent usage of= CW in the EVPN encapsulation within the same EVI (with differences between known unicast and BUM traffic) is alre= ady a fact on the ground (at least, to some extent).

=

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@ecitele.com

 

From: Yutianpeng (Tim) [mailto:yutianpeng@hu= awei.com]
Sent: Tuesday, October 23, 2018 5:48 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; = Wanghaibo (Rainsword) <rainsword.wang@huawei.com>
Cc: draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.o= rg
Subject: RE: A question regarding draft-wang-bess-evepn-control-wor= d

 

Hi Sasha,<= /span>

I am also thinking of= this recently but haven=A1=AFt talked with author yet.<= /p>

What was in my mind t= he solution=20is actually simple: directly tear down (part of) the mac-VRF= or EVI directly if CW capabilities not consistent, considering behavior i= n one EVI should keep consistent (personally believe).  

I might tend to the m= echanism as below:

If router A has CW ca= pabilities and receive type 1 or type 2 routes without CW, then A should d= rop these routes and report an alarm.

If router A does not = has CW capabilities and receive type 1 or type 2 routes with CW, then A sh= ould drop these routes and report an alarm.

I believe the behavio= r within EVI or Mac-VRF should keep consistent, otherwise, more questions = will pop out.

Considering if a serv= ice is sensitive to packet misordering and it is ELAN, I tend to keep beha= vior within this ELAN consistent.

There could also be o= ther problems with this approach, just share an idea so far open the discu= ssion.

Regards, and lots of thanks in advance,

Tim

 

From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Alexander Vainshtein
Sent: 23 October 2018 14:42
To: Wanghaibo (Rainsword) <rainsword.wang@huawei.com>
Cc: draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.org
Subject: Re: [bess] A question regarding draft-wang-bess-evepn-cont= rol-word

 

Dear Haibo,

Again,

Lots of thanks for a prompt response.

 

My reading of your response is as following:

1.       All egress PEs can receive EVPN-enc= apsulated packets without the CW

2.       All ingress PEs can sent EVPN-encap= sulated packets without the CW

3.       An egress PE that can receive EVPN-= encapsulated packets with the CW in the EVPN encapsulation,  must add= the appropriate NH Capability attribute that indicates the CW-indicating label value (explicitly or implicitly) to all= relevant EVPN routes.  This includes:

a.       Per-EVI Ethernet A-D route (EVPN Ro= ute Type 1). In this case the CWI label would follow the label advertised = in the NLRI of this route

b.       MAC/IP Advertisement route (EVPN Ty= pe 2 route). In this case the CWI label would follow the label advertised = in the NLRI as Label1, it would not be relevant for packets that are encapsulated using Label2 (used with the Sy= mmetric EVPN IRB).

4.       An ingress PE that has received an = EVPN route with the CW capability attribute wand that can support usage of= CW in the EVPN encapsulation, will insert both the CWI advertised in the CW capability attribute, and the CW in the= EVPN packets it sends to the corresponding egress PE.  If it does no= t support usage of CW in the encapsulation, it will not insert this label.=

 

Is this understanding correct?

 

If yes, I still have a couple of questions:

1.       Suppose that you use ingress replic= ation (IR) to deliver BUM traffic across EVPN. The Ingress Replication lab= el would be advertised in the PTA attribute of the Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it wil= l not be part of the NLRI. Do you expect the same logic to be used with re= gard to CW capabilities and CWI label advertisement applied also to these = routes?

2.       Per-ES Ethernet A-D Routes are adve= rtised with the ECI expended Community that carries within the so-called E= SI label. This label is included the EVPN encapsulation of BUM packets sent to the PE that is attached to the same = multi-homed ES from which the original ES packet has been received. Do you= expect the same logic to be used with regard to CW capabilities and CWI l= abel advertisement applied also to these routes with the CWI label following the ESI label in the EVPN encap= sulation of BUM packets?

 

Regards, and lots of thanks in advance,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@e= citele.com

 

From: Wanghaibo (Rainsword) [mailto:rainsword.wang@huawei.com]
Sent: Tuesday, October 23, 2018 2:34 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.org
Subject: RE: A question regarding draft-wang-bess-evepn-control-wor= d

 

Hi Alexander,

 

The solution here is to carry= the next hop capability attribute when the route is advertised. The capab= ility carried here is the control word capability.

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

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | Capability Code (2 octets)   |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | Capability Length (2 octets) |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | Capability Value (variable)  |=

    &nbs= p;            =     ~         =             &n= bsp;        ~

    &nbs= p;            =     +------------------------------+

For the control word capabili= ty , it may encode as :

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | CW Capabality Type (TBD)     |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | CW Length (0 or 3)      &nbs= p;    |

    &nbs= p;            =     +------------------------------+

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

    &nbs= p;            =     +------------------------------+

CWI (Control word indication)=

 

And the forwarding Packet exa= mple.

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | Tunnel Label       &nbs= p;         |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | EVI Label       &n= bsp;            |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | CW Indicate Label       = ;     |

    &nbs= p;            =     +------------------------------+

    &nbs= p;            =     | Control word       = ;          |

    &nbs= p;            =     +------------------------------+

 

The difference between the tw= o methods is that which value should be use for the control word capabilit= y indicates label.

 

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

If we use this method, then t= he 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 indication) Label .(Per= haps 8 or others)

 

Method2, use normal value, wh= ich is assigned by router.

If we use this method, then t= he router must assign a label used for the CWI. Perhaps label. And the con= trol word capability attribute=A1=AFs CW length must be 3 and must contain the value in the update message.

The forwarding packet must us= e that value as the CWI label.

 

Regards,

Haibo

 

From: Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.co= m]
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.org
Subject: RE: A question regarding draft-wang-bess-evepn-control-wor= d

 

Dear Haibo,

Lots of thanks for an extra-prompt response to my question.

 

There may be some misunderstanding here.

 

The draft says (the important text is highlighted):

 

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

 

      The first method is to ap= ply for a reserved label to indicate

      whether the packet contai= ns a control word;

 

      The second method is to apply for a new lab= el when the sending

      router advertises the con= trol word capability, which is used to

   = ;   indicate whether the control word is included in the packet<= /span>.

 

My question referred just to the 2nd method, while your r= esponse seems to deal with the 1st one.

 

Did I miss something?

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@e= citele.com

 

From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Wanghaibo (Rainsword)
Sent: Tuesday, October 23, 2018 12:03 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draf= t-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<= o:p>

 

Hi Alexander,

 

The number of routes advertis= ed by the Sender router in our solution will not change, but only carries = a next hop capability attribute with control word capability

The Receiver router determine= s whether to carry the control word when forwarding packets according to i= ts own capabilities.

 

The following figure is an ex= ample.:

PE1----------PE2

= |-----------PE3

When PE1 advertises a route, = it carries the next hop attribute of the control word capability. The rout= es received by PE2 and PE3 are the same.

 

If  PE2 do not support t= he control word, it will not carry the control word when forwarding packet= s to PE1.

PE1 cannot find the control w= ord indication label when parsing the PE2 packet. PE1 will treat the packe= t as normal.

 

If  PE3 support the cont= rol word, it can add a control word when forwarding the packet to the PE1,= and add the control word indication label specified by the PE1.

When the PE1 receives the pac= ket and finds the control word indication label in the packet. PE1 will co= rrectly process the control word.

 

Thanks

Haibo

 

=B7=A2=BC=FE=C8=CB: Alexander= Vainshtein [mailto:Al= exander.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 draf= t-wang-bess-evepn-control-word

 

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

I have doubts regarding at least one of the approac= hes for negotiating the CW usage in the EVPN encapsulation between egress = and ingress PE that is defined in the draft.

 

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

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

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

 

The ingress PE that accepts these 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 encapsulation, while  th= e DP in the egress PW would infer presence or absence of the CW from the received EVPN application label.=

 

Unfortunately, I do not think that this can work be= cause, as per RFC 7432, labels in th= e labeled NLRI of EVPN routes are not part of the route key for the purpos= e 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 = on the way between the egress PE and ingress PE) for the L2VPN/EVPN  = AFI/SAFI, only one of these routes will be selected by the BGP selection p= rocess.

 

Did I miss something substantial here?

 

Regards, and lots of thanks in advance,<= /p>

Sasha

 

Office: +972-39266302

Cell:      +972-549266= 302

Email:   Alexander.Vainshtein@ecitele.com

 


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