Subject: Re: [sfc] #14 (control-plane): Taeho's Comments

From: 강태호(SDN Project) <[email-masked]>
Date: Sun, 4 Oct 2015 02:53:21 +0000

Hi,
Sorry for late reaction.

Resiliency and load balancing might also include additional aspects like below:
In section '4.11.1. Service Function Path Adjustment',
SFP failover and SF/SFC load balancing are discussed.

In SFP failover,
during the process of replacing failed SF instance with another instance,
characteristics of SF(e.g. whether it is mandatory or optional SF) could be considered.
And if it is mandatory, traffic should not bypass the SF but be forwarded to backup SF of same kind, etc.

In SF/SFC load balancing,
mandatory/optional could also be considered in workload distribution.
mandatory SF can be attached to multi SFF considering SFF characteristics(e.g. higher BW, memory, port number, and even NIC controller allocation)
so that it is connected to SFF with more high availability.
Policy-based load balancing and resiliency can be supported by providing multiple instances of mandatory SF(Thanks to Ron's comment).

Best Regards,
Taeho

-----Original Message-----
From: sfc [mailto:[email-masked]] On Behalf Of sfc issue tracker
Sent: Wednesday, September 16, 2015 10:33 PM
To: [email-masked]; [email-masked]
Cc: [email-masked]
Subject: [sfc] #14 (control-plane): Taeho's Comments

#14: Taeho's Comments

 IMHO, for SFC resiliency, the aspect of high availability of SF/SFF should  be emphasized, including failover of SF.
 Some attributes of SFF(e.g. high capacity) and SF(mandatory/optional)  could be considered  for dynamic path selection and connectivity of SFs.
 (http://datatracker.ietf.org/doc/draft-kang-sfc-dynamic-path-selection/)
 Dynamic path selection of multiple instances of SF can be used for policy-  based load balancing as well.

 Draft-ww-sfc-control-plane-06 treats resiliency and load balancing,  and I think these parts could be further extended with support of WG.

 Best Regards,
 Taeho

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 Reporter:                           |      Owner:  draft-ietf-sfc-control-
  [email-masked]       |  [email-masked]
     Type:  enhancement              |     Status:  new
 Priority:  minor                    |  Milestone:
Component:  control-plane            |    Version:
 Severity:  -                        |   Keywords:
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Ticket URL: <http://trac.tools.ietf.org/wg/sfc/trac/ticket/14>
sfc <http://tools.ietf.org/sfc/>

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