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Re: [OSPF] draft-ietf-ospf-link-overload-06 - DR migration

Alexander Okonnikov <alexander.okonnikov@gmail.com> Mon, 24 April 2017 10:03 UTC

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To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>
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From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
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Date: Mon, 24 Apr 2017 13:03:17 +0300
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Subject: Re: [OSPF] draft-ietf-ospf-link-overload-06 - DR migration
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Hi Shraddha,


For planned link maintenance there still could be traffic disruption. 
Even if router with overloaded link is detached from broadcast link, the 
latter still could be used by other routers on this one. If router with 
overloaded link was DR, traffic between other routers on broadcast link 
could be disrupted. Am I correct?


24.04.2017 12:55, Shraddha Hegde пишет:
>
> Hi Alexander,
>
> The objective of this draft is to re-route the traffic from the link 
> that is expected to undergo maintenance
>
> And the case of broadcast links  is explained in sec 5.2 which 
> achieves the objective.
>
> The case you described may be relevant for unplanned link-down events 
> which is outside the scope of this draft.
>
> Thanks
>
> Shraddha
>
> *From:*Alexander Okonnikov [mailto:alexander.okonnikov@gmail.com]
> *Sent:* Thursday, April 20, 2017 6:50 PM
> *To:* draft-ietf-ospf-link-overload@ietf.org; ospf@ietf.org
> *Subject:* draft-ietf-ospf-link-overload-06 - DR migration
>
> Hi authors,
>
> In case when the node that has the link to be overloaded is DR (for
> broadcast/NBMA link case), taking this link out of service could be
> disruptive. What if to modify procedure in such manner that when BDR
> receives Link-Overload-sub-TLV from DR, it generates Network LSA in
> advance, before taking DR role. The node with overloading link then
> waits some time (for example, 3 secs) and changes its interface priority
> to 0.
>
> Thank you.
>

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