Hi Oliver Just a small doubt default maximumLSPGenerationInterval is 15 mins & so is SPF run . If we fine tune our maximumLSPGenerationInterval to 65000 secs i.e 1083 mins , Still my ISIS SPF Periodic will be 15 mins ??
(lsp-refresh-interval set to 65000 and max-lsp-lifetime set to 65535). Thanks, Amit --- On Fri, 1/11/13, Oliver Boehmer (oboehmer) <[email protected]> wrote: > From: Oliver Boehmer (oboehmer) <[email protected]> > Subject: Re: [c-nsp] Link State Periodic SPF > To: "Dhamija Amit" <[email protected]>, "[email protected]" > <[email protected]> > Date: Friday, January 11, 2013, 7:30 AM > > > On 11/01/2013 03:02, "Dhamija Amit" <[email protected]> > wrote: > > >Hi > > > >I would like to know about Link state Periodic SPF's , I > have seen in > >Cisco IOS-XR and Juniper M/T -Series ( Junos) by default > Periodic SPF > >runs every 15 minutes. > > > >Going to concept of SPF whenever there is change in > topology router runs > >SPF based on SPF interval configured. Also when LSP/LSA > refreshes after > >certain period then during that time also router > executes SPF's.Then what > >is the purpose of periodic SPF's . Can we disable the > same , What kind of > >impact will be there ?? > > ISIS standard (7.3.18) asks for at least one SPF every > maximumLSPGenerationInterval (which is, by default 15 mins). > On today's > routers, SPF takes a few msecs, so there is not concern > running this every > 15 min.. XR allows to disable the period SPF > (privileged/cisco-support > "spf periodic disable" command in ISIS AF mode), but I don't > see a reason > why someone would need it. > As far as I know, a refreshed LSP does NOT trigger an SPF > unless it > contains changed topology information. > > oli > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
