Re: [bess] [Idr] Review request for draft-ietf-bess-srv6-services-11

[[e-mail]]

Hi Ketan，






Thanks for your reply,


Please see inline below.






Thanks


Yubao














原始邮件



发件人：KetanTalaulikar
收件人：王玉保10045807;
抄送人：[e-mail];BESS;
日 期 ：2022年03月04日 14:08
主 题 ：Re: [bess] [Idr] Review request for draft-ietf-bess-srv6-services-11




Hi Yubao,
Thanks for your email. Please check inline below.





On Thu, Mar 3, 2022 at 8:20 AM <[e-mail]> wrote:




Hi authors,

 

   I reviewed this draft and  I don't understand this  sentence very well:  "The  SRv6 Endpoint behavior of the Service SID thus signaled is entirely up to the originator of the advertisement"



KT> Indeed. The egress PE is the one that picks the SRv6 SID to be signaled with the specific route. 



[Yubao 2] I mean the SRv6 Endpoint Behavior field of the SRv6 SID Information Sub-TLV, I know the SID is picked by the originator,

                but I am not sure whether that behavior field should be set to "End.DT2M" or not,

                and I am not sure whether it will be considered to be invalid if that behavior field is set to other values.

    Is it saying that when PE1 receives an Ethernet A-D per ES route whose SRv6 SID Information Sub-TLV's  SRv6 Endpoint Behavior field  is set to X （where X is not 0xFFFF),

   that Ethernet A-D per ES route should be indifferently processed by PE1 no matter what value will  X be set to?



KT> I am not sure of the draft text that you are referring to when drawing up this inference. For SRv6 SID behaviors that use arguments (e.g. Ethernet A-D per ES routes with behavior End.DT2M), it is necessary for the ingress PE to not be indifferent to the behavior since it needs to put the argument part correctly in the SRv6 SID used on the data path.  




[Yubao 2] If the ingress PE receives an Ethernet A-D per ES route whose SRv6 SID Information Sub-TLV's  SRv6 Endpoint Behavior field  is set to 0x0508 (or any other unassigned values of RFC8986)

                But the IMET route it received carried a Behavior value of 'End.DT2M', 

                Will the ingress PE treat that Ethernet A-D per ES route as an invalid route?







   Is it necessary for the receiver-side processing of Ethernet A-D per ES route's Endpoint Behavior field to be clearly described?



KT> Sec 6.3 is where the egress PE processing and use of the ARG received via the Ethernet A-D per ES route with the SRv6 SID received along with Route Type 3 is described.



[Yubao 2] I think section 6.3 mainly says that the behavior field of IMET routes should be 'End.DT2M', 

                but it is not clear whether the behavior field of Ethernet A-D per ES route must be set to 'End.DT2M'.




Thanks,
Ketan
 


Thanks,


Yubao