Re: [Teas] Suresh Krishnan's Discuss on draft-ietf-teas-rsvp-te-srlg-collect-06: (with DISCUSS)

["Adrian Farrel" <[e-mail]>]

Theoretically, only the end-points add RROs. Once an RRO is stripped it will not
be added back in (in practice, some domain boundaries might add RROs back in).
The para after the quoted one says that further refreshes should entirely remove
the RRO, but what is more likely to happen is that an alarm will be raised and
the LSP will be torn down. The operator will then go and look to see why his
signaling message grew so unbelievably large and will either fix the topology
bug, turn off some features, or shout at the vendor.

A

> -----Original Message-----
> From: Suresh Krishnan [mailto:[e-mail]]
> Sent: 15 June 2016 18:27
> To: [e-mail]; 'The IESG'
> Cc: [e-mail]; [e-mail];
> [e-mail]; [e-mail]
> Subject: Re: [Teas] Suresh Krishnan's Discuss on draft-ietf-teas-rsvp-te-srlg-
> collect-06: (with DISCUSS)
> 
> Hi Adrian,
> 
> On 06/15/2016 08:14 AM, Adrian Farrel wrote:
> > Suresh,
> >
> > I think that if an RRO causes an RSVP-TE message to get full then it is a
pretty
> > grim situation.
> >
> > However, 3209 says...
> >
> >     If the newly added subobject causes the RRO to be too big to fit in a
> >     Path (or Resv) message, the RRO object SHALL be dropped from the
> >     message and message processing continues as normal. A PathErr (or
> >     ResvErr) message SHOULD be sent back to the sender (or receiver).  An
> >     error code of "Notify" and an error value of "RRO too large for MTU"
> >     is used.  If the receiver receives such a ResvErr, it SHOULD send a
> >     PathErr message with error code of "Notify" and an error value of
> >     "RRO notification".
> >
> > Does that answer you?
> 
> Not exactly. I had followed the same reference to this text as well. My
> question was more about what happens to the message that gets forwarded
> (due
> to the message processing continuing as normal) on the next node that gets
> the message with the SRLG collection flag set but without the RRO. Does it
> add an RRO? Does it drop the message? ...
> 
> Thanks
> Suresh
> 
> 
> =