I got it. Thanks Les for the details and reference. Regards, Anil
On Tue, Aug 25, 2015 at 10:11 PM, Acee Lindem (acee) <[email protected]> wrote: > I agree. Thanks Les for the reference to RFC 5882. > > Thanks, > Acee > > From: "Les Ginsberg (ginsberg)" <[email protected]> > Date: Tuesday, August 25, 2015 at 12:29 PM > To: Anil Raj <[email protected]> > Cc: Acee Lindem <[email protected]>, OSPF WG List <[email protected]> > Subject: RE: [OSPF] OSPF GR and BFD operability > > Anil – > > > > IF BFD does NOT share fate w the Control plane then what you say is true. > > > > If BFD shares fate w the control plane then the behavior depends on the > neighbor knowing that a restart is in progress. If neighbor knows this then > the BFD down event can be ignored w minimal risk – otherwise you need to > treat it as a real failure. > > > > Les > > > > > > *From:* Anil Raj [mailto:[email protected] <[email protected]>] > *Sent:* Tuesday, August 25, 2015 8:51 AM > *To:* Les Ginsberg (ginsberg) > *Cc:* Acee Lindem (acee); OSPF WG List > *Subject:* Re: [OSPF] OSPF GR and BFD operability > > > > Thanks Acess, Les. > > > > So ideally it is recommended to tear down OSPF adjacency and signal > topology change, and thus honor BFD notification in this case. > > > > Regards, > > Anil > > > > On Tue, Aug 25, 2015 at 8:57 PM, Les Ginsberg (ginsberg) < > [email protected]> wrote: > > https://www.rfc-editor.org/rfc/rfc5882.txt Section 4.3 > <https://www.rfc-editor.org/rfc/rfc5882.txt%20Section%204.3> is relevant > here. > > > > Les > > > > > > *From:* OSPF [mailto:[email protected]] *On Behalf Of *Acee Lindem > (acee) > *Sent:* Tuesday, August 25, 2015 7:54 AM > *To:* Anil Raj; OSPF WG List > *Subject:* Re: [OSPF] OSPF GR and BFD operability > > > > Hi Anil, > > > > OSPF and OSPFv3 graceful restart pre-dated BFD so this wasn’t explicitly > covered. However, given that the intension is that the data plane is > preserved during restart, an implementation could interpret this as a > topology change and terminate helper mode as documented in section 3.2 of > RFC 3623. > > Hope this helps, > > Acee > > > > > > > > *From: *OSPF <[email protected]> on behalf of Anil Raj < > [email protected]> > *Date: *Tuesday, August 25, 2015 at 10:19 AM > *To: *OSPF WG List <[email protected]> > *Subject: *[OSPF] OSPF GR and BFD operability > > > > Hi, > > > > I need clarification on the behavior when BFD notifies remote inactivity > for a OSPF session, when OSPF neighbor is undergoing Graceful restart? OSPF > router in helper mode will ideally inactivate the restarting neighbor only > after grace period, and if BFD notifies neighbor down to OSPF, should the > adjacency be terminated? If not, will it cause a blackhole for the entire > grace period if the neighbor is actually down? > > > > Appreciate if you can help here. > > > > Regards, > > Anil > > > >
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