02-06-2014 12:15 PM - edited 03-07-2019 06:03 PM
Hey Guys,
If I have a router with 3 sub interfaces off of a GigabitEthernet interface which is directly connected to a switch via a trunk, would I need to set 'ip ospf mtu-ignore'?
I'm assuming that if I'm running subinterfaces using dot1q, that the mtu in the DBD packets will be 1504 and which it hits either a router port on a L3 switch or a SVI it would be 1500?
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02-07-2014 02:50 AM
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Posting
John the router's subinterface and the switch's trunk should "hide" the VLAN tags. I.e. there shouldn't be any need for mtu-ignore (as least I never recall a need for it on such configurations).
02-07-2014 02:50 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.
Liability Disclaimer
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
John the router's subinterface and the switch's trunk should "hide" the VLAN tags. I.e. there shouldn't be any need for mtu-ignore (as least I never recall a need for it on such configurations).
02-07-2014 03:08 AM
Thanks for this response, I appreciate it. I was a little curious as to how that would work.
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