03-18-2012 01:04 AM - edited 03-04-2019 03:42 PM
Does anybody knows what is this used for?
TMT-HE-GW(config)#router ospf 1
TMT-HE-GW(config-router)#p?
Router configuration commands:
passive-interface Suppress routing updates on an interface
prefix-suppression OSPF prefix suppression
priority OSPF topology priority
TMT-HE-GW(config-router)#priority ?
<0-127> OSPF topology priority
Totally undocumented, started appearing in 15.1
03-18-2012 04:01 AM
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Posting
As a guess, something like AD for multiple OSPF processes on the same device.
03-18-2012 04:16 AM
Hi Joseph,
Hey, you've become all purple! Congratulations, it's more than well earned and deserved!
Hmmm, I am also making a guess but I don't think this has to do with AD. Among others, the range of permitted values does not fit: it's between 0 and 127, while AD is usually configurable between 1 and 255. The keyword established for AD is distance and I don't think it would get changed.
My personal opinion: This priority may be related to the scheduling of SPF runs between different topologies. In case of a need to run the SPF for multiple topologies, they will be scheduled according to their priority, highest-priority-first, thereby making convergence in selected topologies more expedite.
Paolo, does that command accept any other parameter besides the numerical priority?
In any case, we're just guessing. I hope Edison and other experts from Cisco will join and provide an authoritative information.
Best regards,
Peter
03-18-2012 05:04 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Peter, thank you for the congrats. (If you're wondering how you jump from gold to purple, a couple years ago when Cisco did maintenance on this site they spawned off a new account. My original account was close to purple. I recently asked Dan to merge the original and spawned accounts since I've resumed posting.)
Sorry, I wasn't clear when I wrote "something like AD". What I had in mind, this value might allow you to take one OSPF process's routes in preference to another OSPF process since they would both have the same AD and you can have multiple OSPF processes on the same platform. I.e. this isn't directly related to AD except as an additional "tie breaker". Again, though, just a guess.
Your guess, though, is interesting too.
Paolo, anything similar for EIGRP?
03-18-2012 06:02 AM
I have a feeling, that if one was to read the IETF working group "works", would find what is that. But, I'm just too lazy /
03-18-2012 07:04 AM
Paolo,
As a matter of fact I went over the RFC 4915 (MTR for OSPF) but did not find any mention of a priority of any kind.
Once again, is the priority value the only valid argument for this command?
Best regards,
Peter
08-21-2016 01:47 AM
It is indeed used for MTR OSPF
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mtr/configuration/15-s/mtr-15-s-book/ospf-support-mtr.html
03-20-2012 08:00 AM
Yes.
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