Re: [spring] Is srv6 PSP a good idea

2020-03-02 Thread Mark Smith
ices. Note that ESP can be >>used to provide only integrity, without confidentiality, making it >>comparable to AH in most contexts.) >> >> >> Thanks, >> Jingrong >> >> -Original Message- >> From: spring [mailto:spring-boun...@ie

Re: [spring] Is srv6 PSP a good idea

2020-02-27 Thread Voyer, Daniel
Ridiculous .. any NOS coder, coding IPv6, would have awareness of 2460, why would you even go there .. seriously ? The highlight was for: https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#page-4 - you should probl read it all. I think we've reach the limit of what the "IET

Re: [spring] Is srv6 PSP a good idea

2020-02-27 Thread Fernando Gont
On 27/2/20 18:11, Darren Dukes (ddukes) wrote: Mark AH is not defined for SRH.  There is no specification to ignore. Do you realize that you are using IPv6, and that AH is specified for IPv6? Is the AD watching? -- Seriously, this is going through a very curious and dangerous path. For the

Re: [spring] Is srv6 PSP a good idea

2020-02-27 Thread Darren Dukes (ddukes)
y 26, 2020 8:31 AM To: Pablo Camarillo (pcamaril) mailto:pcama...@cisco.com>> Cc: Ron Bonica mailto:rbon...@juniper.net>>; spring@ietf.org<mailto:spring@ietf.org>; Joel M. Halpern mailto:j...@joelhalpern.com>> Subject: Re: [spring] Is srv6 PSP a good idea Hi Pablo, On Sat,

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
> > You realise that the 3 musketeers were heroes in that story? > Oh I do. And I want to sincerely congratulate three of you to be very effective to discourage touching IPv6, its dogmas and principles. If this is good for the industry, time will tell. To me I got even more assurance now that IP

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Mark Smith
On Thu, 27 Feb 2020 at 06:46, Robert Raszuk wrote: > > Hey Sander, > > No worries ... three IPv6 musketeers have already presented themselves well > to this discussion. This was just one more demo of it. No need to apologize - > at least me :) > You realise that the 3 musketeers were heroes in

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 18:20, Sander Steffann wrote: Hi John, So you are saying that other than the PSP issue, you support moving the document forward? Yes. As long as it doesn't violate existing RFCs and with that potentially causes trouble for implementations that expect those RFCs to be followed I'

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Sander Steffann
Hi John, > So you are saying that other than the PSP issue, you support moving the > document forward? Yes. As long as it doesn't violate existing RFCs and with that potentially causes trouble for implementations that expect those RFCs to be followed I'm fine with it. It's not something I wou

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 18:02, john leddy.net wrote: So you are saying that other than the PSP issue, you support moving the document forward? A number of us had repeatedly expressed their concerns with the document. Please check the mailing-list archives. I haven't argued in favor or against the docume

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread john leddy.net
So you are saying that other than the PSP issue, you support moving the document forward? > On February 26, 2020 at 3:40 PM Fernando Gont wrote: > > > On 26/2/20 17:22, john leddy.net wrote: > > I would suggest that people read RFC 7282 - "On Consensus and Humming in > > the IETF"... > > >

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 17:22, john leddy.net wrote: I would suggest that people read RFC 7282 - "On Consensus and Humming in the IETF"... My question is: How do you reach Consensus when the complaint is about how many milliseconds it takes to shoot down a proposal? This document proposes a *major* chang

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Sander Steffann
> Definitely the proposal. That a vendor seems to have an inappropriate amount > of influence on the IETF process is just an additional concern. PS: that the vendor is Cisco in this instance is not relevant. Any vendor doing this would be equally bad. Any major vendor has played inappropriate ga

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Sander Steffann
Hi John, > I would suggest that people read RFC 7282 - "On Consensus and Humming in the > IETF"... > > My question is: How do you reach Consensus when the complaint is about how > many milliseconds it takes to shoot down a proposal? > > Is this about the proposal or the vendor involved? Defin

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread john leddy.net
I would suggest that people read RFC 7282 - "On Consensus and Humming in the IETF"... My question is: How do you reach Consensus when the complaint is about how many milliseconds it takes to shoot down a proposal? Is this about the proposal or the vendor involved? > > A number of us wonder h

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 16:44, Robert Raszuk wrote: Hey Sander, No worries ... three IPv6 musketeers have already presented themselves well to this discussion. This was just one more demo of it. No need to apologize - at least me :) And while you can call someone's opinion the way you like - the fact th

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Sander Steffann
Hi Robert, > No worries ... three IPv6 musketeers have already presented themselves well > to this discussion. This was just one more demo of it. No need to apologize - > at least me :) > > And while you can call someone's opinion the way you like - the fact that > SRv6 builds on top of IPv6 d

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
Hey Sander, No worries ... three IPv6 musketeers have already presented themselves well to this discussion. This was just one more demo of it. No need to apologize - at least me :) And while you can call someone's opinion the way you like - the fact that SRv6 builds on top of IPv6 does not make i

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Dirk Steinberg
On Wed, Feb 26, 2020 at 6:55 PM Fernando Gont wrote: > On 26/2/20 12:57, Dirk Steinberg wrote: > > Hi Fernando, > > > > adding to my own comment and to be more specific: > > > > The existing RFCs are very clear in their wording that > > the node identified in the Destination Address field of > >

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 12:57, Dirk Steinberg wrote: Hi Fernando, adding to my own comment and to be more specific: The existing RFCs are very clear in their wording that the node identified in the Destination Address field of the  IPv6 header is free to do whatever it desires with the packet it just receiv

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Tom Herbert
On Wed, Feb 26, 2020, 6:26 AM Andrew Alston wrote: > Figured I’d add to this – as I continued to read the charter > > > > *SPRING WG should avoid modification to existing data planes that would* > > > > > > > > > * make them incompatible with existing deployments. Where possible, > existing contr

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Joel M. Halpern
:rbon...@juniper.net>> > Date: Tuesday, 17 December 2019 at 16:06 > To: "Pablo Camarillo (pcamaril)" mailto:pcama...@cisco.com>>, "Joel M. Halpern" mailto:j...@joelhalpern.com>>, "spring@ietf.org <mailto:spring@ietf.

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Dirk Steinberg
; Hi Mark, >> > >> > Thank you for your feedback. Please see inline [PC1]. >> > >> > Cheers, Pablo. >> > >> > -Original Message- From: Mark Smith >> > Date: Wednesday, 26 February 2020 at 01:31 >> > To: "Pablo Camarillo

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Dirk Steinberg
-Original Message- From: Mark Smith > > Date: Wednesday, 26 February 2020 at 01:31 > > To: "Pablo Camarillo (pcamaril)" Cc: Ron Bonica > > , "Joel M. Halpern" , > > "spring@ietf.org" Subject: Re: [spring] Is srv6 PSP > >

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Wang, Weibin (NSB - CN/Shanghai)
Hi Mark I have comment below; Cheers! Wang Weibin From: spring On Behalf Of Mark Smith Sent: Wednesday, February 26, 2020 7:45 PM To: Robert Raszuk Cc: Ron Bonica ; spring@ietf.org; Joel M. Halpern ; Pablo Camarillo (pcamaril) Subject: Re: [spring] Is srv6 PSP a good idea and no doubt

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
Joel M. Halpern" , "spring@ietf.org" Subject: Re: [spring] Is srv6 PSP a good idea Hi Pablo, On Sat, 21 Dec 2019 at 04:38, Pablo Camarillo (pcamaril) wrote: Hi Ron, I guess we are making some progress here but going in some circles. So far we have moved from “this violates RFC8200”

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Fernando Gont
On 26/2/20 11:15, Andrew Alston wrote: +1 Sander. Furthermore – if indeed that is the contention – then – I suggest you move the whole thing out of SPRING – I quote from the SPRING charter: /The Source Packet Routing in NetworkinG (SPRING) Working Group is thehome of Segment Routing (SR)

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Andrew Alston
Figured I'd add to this - as I continued to read the charter SPRING WG should avoid modification to existing data planes that would make them incompatible with existing deployments. Where possible, existing control and management plane protocols must be used within existing architectures to implem

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Andrew Alston
Of Sander Steffann Sent: Wednesday, 26 February 2020 16:49 To: Robert Raszuk Cc: spring@ietf.org; 6man WG Subject: Re: [spring] Is srv6 PSP a good idea Hi Robert, > Regardless if folks agree or not with that SRv6 is a new data plane. SRv6 != > IPv6 that's obvious. > > It also do

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Pablo Camarillo (pcamaril)
t; Happy Holidays, > Pablo. > > > -Original Message- > From: Ron Bonica > Date: Tuesday, 17 December 2019 at 16:06 > To: "Pablo Camarillo (pcamaril)" , "Joel M. Halpern" , "spring@ietf.org" > Subject: RE: [spr

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
nt:* Wednesday, February 26, 2020 8:06 AM > *To:* Mark Smith > *Cc:* Xiejingrong (Jingrong) ; Ron Bonica < > rbon...@juniper.net>; spring@ietf.org; Joel M. Halpern < > j...@joelhalpern.com>; Pablo Camarillo (pcamaril) > *Subject:* Re: [spring] Is srv6 PSP a good idea &g

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Sander Steffann
Hi Robert, > Regardless if folks agree or not with that SRv6 is a new data plane. SRv6 != > IPv6 that's obvious. > > It also does not attempt to *extend* IPv6. It reuses some IPv6 elements and > makes sure non SRv6 nodes can treat the packets as vanilla IPv6, but that's > it. With that in min

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread James Guichard
+1 and well said! From: spring On Behalf Of Robert Raszuk Sent: Wednesday, February 26, 2020 8:06 AM To: Mark Smith Cc: Xiejingrong (Jingrong) ; Ron Bonica ; spring@ietf.org; Joel M. Halpern ; Pablo Camarillo (pcamaril) Subject: Re: [spring] Is srv6 PSP a good idea > Somebody choosing

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
> Somebody choosing not to use AH doesn't mean SPRING can ignore the IPv6 specifications. I think it sure can and in fact it should. See there is perhaps key misunderstanding here. Regardless if folks agree or not with that SRv6 is a new data plane. SRv6 != IPv6 that's obvious. It also does not

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Mark Smith
...@ietf.org] On Behalf Of Mark Smith > Sent: Wednesday, February 26, 2020 8:31 AM > To: Pablo Camarillo (pcamaril) > Cc: Ron Bonica ; spring@ietf.org; Joel M. Halpern < > j...@joelhalpern.com> > Subject: Re: [spring] Is srv6 PSP a good idea > > Hi Pablo, > > On Sat,

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Mark Smith
; explanation to provide. >>> > >>> >>> "Just because you can do something, doesn't mean you should." >>> >>> How much troubleshooting experience have they had with this? >>> >>> I think a very important factor is how

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Chengli (Cheng Li)
esday, February 26, 2020 6:07 PM To: Mark Smith Cc: Ron Bonica ; spring@ietf.org; Joel M. Halpern ; Pablo Camarillo (pcamaril) Subject: Re: [spring] Is srv6 PSP a good idea So now we have one more to Pablo's list: "Let's not use it as it is hard to troubleshoot" ... Cl

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
very important factor is how easy something is to >> troubleshoot - how obvious is the mechanism works; is the mechanism >> consistent with existing behaviours i.e. the principle of least >> surprise (removing EHs at an intermediary hop certainly isn't in IPv6, >> even if

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Huzhibo
lpern Subject: Re: [spring] Is srv6 PSP a good idea Hi Mark, I think both AH and PSP are optional. If AH is desired to deploy, then the operator can choose not to use PSP. If AH is not deployed, and the operator has its requirements of incremental-deployment, then the operator can choose to use PS

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Robert Raszuk
:06 > > To: "Pablo Camarillo (pcamaril)" , "Joel M. > Halpern" , "spring@ietf.org" > > Subject: RE: [spring] Is srv6 PSP a good idea > > > > Pablo, > > > > In your message below, are you arguing that it is easier for

Re: [spring] Is srv6 PSP a good idea

2020-02-26 Thread Xiejingrong (Jingrong)
pring@ietf.org; Joel M. Halpern Subject: Re: [spring] Is srv6 PSP a good idea Hi Pablo, On Sat, 21 Dec 2019 at 04:38, Pablo Camarillo (pcamaril) wrote: > > Hi Ron, > > I guess we are making some progress here but going in some circles. So far we > have moved from “this violates RF

Re: [spring] Is srv6 PSP a good idea

2020-02-25 Thread Mark Smith
Message- > From: Ron Bonica > Date: Tuesday, 17 December 2019 at 16:06 > To: "Pablo Camarillo (pcamaril)" , "Joel M. Halpern" > , "spring@ietf.org" > Subject: RE: [spring] Is srv6 PSP a good idea > > Pablo, > > In your message be

Re: [spring] Is srv6 PSP a good idea

2019-12-21 Thread Ron Bonica
Subject: Re: [spring] Is srv6 PSP a good idea Hi Ron, I guess we are making some progress here but going in some circles. So far we have moved from “this violates RFC8200” to “there are no use-cases or benefits” to “this is complex for an ASIC” to “what is the benefit again” and now back to “this

Re: [spring] Is srv6 PSP a good idea

2019-12-20 Thread Pablo Camarillo (pcamaril)
onica Date: Tuesday, 17 December 2019 at 16:06 To: "Pablo Camarillo (pcamaril)" , "Joel M. Halpern" , "spring@ietf.org" Subject: RE: [spring] Is srv6 PSP a good idea Pablo, In your message below, are you arguing that it is easier for the penultimate node t

Re: [spring] Is srv6 PSP a good idea

2019-12-17 Thread Gyan Mishra
> > Juniper Business Use Only > > -Original Message- > From: Pablo Camarillo (pcamaril) > Sent: Saturday, December 14, 2019 4:50 AM > To: Ron Bonica ; Joel M. Halpern ; > spring@ietf.org > Subject: Re: [spring] Is srv6 PSP a good idea > > Ron, > >

Re: [spring] Is srv6 PSP a good idea

2019-12-17 Thread Ron Bonica
Only -Original Message- From: Pablo Camarillo (pcamaril) Sent: Saturday, December 14, 2019 4:50 AM To: Ron Bonica ; Joel M. Halpern ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea Ron, What is the "price paid by the penultimate segment"? All the current imple

Re: [spring] Is srv6 PSP a good idea

2019-12-17 Thread Ron Bonica
, Ron Juniper Business Use Only -Original Message- From: spring On Behalf Of Voyer, Daniel Sent: Friday, December 13, 2019 5:14 PM To: Xiejingrong (Jingrong) ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea I agree 100% with Jingrong, PSP allows us

Re: [spring] Is srv6 PSP a good idea

2019-12-16 Thread David Allan I
HI Pablo: Replies in-line prefaced with DA> -Original Message- From: spring On Behalf Of Pablo Camarillo (pcamaril) Sent: Saturday, December 14, 2019 1:57 AM To: Xiejingrong (Jingrong) ; Joel M. Halpern ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea Hi Dave, Th

Re: [spring] Is srv6 PSP a good idea

2019-12-15 Thread Gyan Mishra
Robert Thank you for your candid and concise response. Your response is exactly what I was looking for from Spring. There has been a lot of development across almost every IETF WG related to the SR specification for years now and I was not there Day 2 and even for many of the former years during

Re: [spring] Is srv6 PSP a good idea

2019-12-15 Thread Robert Raszuk
Gyan, Do you think that sending the exact same email twice by copy and paste makes it any more valid ? All, To all opponents of PHP - let me refresh you with a bit of SR history. SR assumed that most of the operational behaviour will be SID type agnostic. Regardless if I use MPLS SID or IPv6 SID

Re: [spring] Is srv6 PSP a good idea

2019-12-15 Thread Gyan Mishra
Dan The concept of PHP “Penultimate Hop POP” and UHP “Ultimate Hop POP” have historical meaning as well as real consequences as far as a packet walk through an mpls network. >From a historical perspective which is really the correct way to look at PHP in the MPLS world was designed by the develop

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Gyan Mishra
s, > Mark. > > > >> Ron >> >> >> >> >> Juniper Business Use Only >> >> -Original Message- >> From: spring On Behalf Of Pablo Camarillo >> (pcamaril) >> Sent: Wedne

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Mark Smith
t; Ron > > > > > Juniper Business Use Only > > -Original Message----- > From: spring On Behalf Of Pablo Camarillo > (pcamaril) > Sent: Wednesday, December 11, 2019 3:12 PM > To: Joel M. Halpern ; spring@iet

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Mark Smith
..@ietf.org] on behalf of Joel M. Halpern [ > j...@joelhalpern.com] > Sent: Wednesday, December 11, 2019 22:15 > To: spring@ietf.org > Subject: Re: [spring] Is srv6 PSP a good idea > > Thank you Jingrong for providing some of the other motivations. Two > furhter comments. &g

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Xiejingrong (Jingrong)
dnesday, December 11, 2019 22:15 To: spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea Thank you Jingrong for providing some of the other motivations. Two furhter comments. As far as I know, the only savings on the end box is the processing for noticing the SRH, noticing that SL is 0

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Pablo Camarillo (pcamaril)
pe this helps Dave -Original Message- From: spring On Behalf Of Pablo Camarillo (pcamaril) Sent: Wednesday, December 11, 2019 12:12 PM To: Xiejingrong (Jingrong) ; Joel M. Halpern ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Pablo Camarillo (pcamaril)
NVAeEWpnAI Cheers, Pablo. -Original Message- From: Ron Bonica Date: Thursday, 12 December 2019 at 21:50 To: "Pablo Camarillo (pcamaril)" , "Joel M. Halpern" , "spring@ietf.org" Subject: RE: [spring] Is srv6 PSP a good idea Pablo, I am not convi

Re: [spring] Is srv6 PSP a good idea

2019-12-14 Thread Pablo Camarillo (pcamaril)
te: Thursday, 12 December 2019 at 06:48 To: "Pablo Camarillo (pcamaril)" , "spring@ietf.org" Subject: Re: [spring] Is srv6 PSP a good idea There are several aspects of your reply that leave me wondering. First, optional behaviors in a protocol spec have signficia

Re: [spring] Is srv6 PSP a good idea

2019-12-13 Thread Joel M. Halpern
That is an udnerstandable argument, ... except: It does not acknowledge that there is a cost for this capability, or discuss the tradeoff. PSP clearly has a cost. Also, that does not match my reading of the definition of the SR domain. In fact, it becomes very confusing as to whether the PE

Re: [spring] Is srv6 PSP a good idea

2019-12-13 Thread Voyer, Daniel
I agree 100% with Jingrong, PSP allows us to bring SRv6 to legacy PE devices that are not capable of processing the SRH in the dataplane, but are capable of supporting SRv6 in the control plane. See this example: I am streaming traffic from a server to a customer; The ingress PE (near the serv

Re: [spring] Is srv6 PSP a good idea

2019-12-12 Thread David Allan I
esday, December 11, 2019 12:12 PM To: Xiejingrong (Jingrong) ; Joel M. Halpern ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea Jingrong, > Nothing new, but benefits that people have already said seems notable to me. Agreed. Cheers, Pablo. -Original Message- From: sp

Re: [spring] Is srv6 PSP a good idea

2019-12-12 Thread Ron Bonica
Ron Juniper Business Use Only -Original Message- From: spring On Behalf Of Pablo Camarillo (pcamaril) Sent: Wednesday, December 11, 2019 3:12 PM To: Joel M. Halpern ; spring@ietf.org Subject: Re: [spring] Is srv6 PSP a good idea Joel, 1.- The use-case for PSP has already been provi

Re: [spring] Is srv6 PSP a good idea

2019-12-11 Thread Joel M. Halpern
There are several aspects of your reply that leave me wondering. First, optional behaviors in a protocol spec have signficiant cost. So if they are nbot needed, we generally prefer not to have options. Second, I am confused by your comments about complexity. From my conversations with multi

Re: [spring] Is srv6 PSP a good idea

2019-12-11 Thread Pablo Camarillo (pcamaril)
Joel, 1.- The use-case for PSP has already been provided at the mailer. There are scenarios where it provides benefits to operators. 2.- The PSP behavior is optional. It is up to the operator in his deployment to decide whether to enable it or not at one particular router. Similarly, a vendor m

Re: [spring] Is srv6 PSP a good idea

2019-12-11 Thread Pablo Camarillo (pcamaril)
ring@ietf.org" Subject: Re: [spring] Is srv6 PSP a good idea I think it's a good idea. Nothing new, but benefits that people have already said seems notable to me. (1) reduce the load of final destination. This benefit can be notable for the following sub reasons.

Re: [spring] Is srv6 PSP a good idea

2019-12-11 Thread Joel M. Halpern
Thank you Jingrong for providing some of the other motivations. Two furhter comments. As far as I know, the only savings on the end box is the processing for noticing the SRH, noticing that SL is 0 and there are no relevant TLVs, and then moving on. If the actual end device is not part of t

Re: [spring] Is srv6 PSP a good idea

2019-12-10 Thread Xiejingrong (Jingrong)
I think it's a good idea. Nothing new, but benefits that people have already said seems notable to me. (1) reduce the load of final destination. This benefit can be notable for the following sub reasons. (1.1) final destination tends to have heavy load. It need to handle all the EHs and do the d