[c-nsp] Cisco IIH padding

[Brad Gould]

IOS-XE mtu values are consistent with IOS. (IOS-XR is different to IOS/XE with regards to the different L2/L3 values).

Brad


> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Vinny_Abello at Dell.com
> Sent: Wednesday, 26 November 2014 04:58
> To: nsp.lists at gmail.com; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Cisco IIH padding
> 
> Dell - Internal Use - Confidential
> 
> The first five IS-IS hellos are still padded to the full MTU size and subsequent
> hellos are not once the adjacency is formed... this is to detect MTU
> mismatches. If you cannot fix the MTU mismatch for some reason, you can also
> work around it by setting the clns mtu size to match on both sides which
> should also work. I would recommend setting the physical MTU of the
> interface to what is supported on the link, though. I'm not familiar with IOS-XE,
> but I know IOS-XR and IOS need to have their MTU's adjusted accordingly,
> which means they won't be the same numeric value. Someone more familiar
> with IOS-XE may know if this is also an issue or not.
> 
> -Vinny
> 
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Alex K.
> Sent: Tuesday, November 25, 2014 12:52 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Cisco IIH padding
> 
> Hello everybody,
> 
> Although I have “no hello padding” configured, the adjacency won't come up
> until I limit the CLNS MTU on some link in my network (there is an MTU issue
> on that link, it's not 1500).
> 
> As far as I remember, Cisco IOS implementation of IS-IS will *still send out
> first* IIHs padded, never mind I had “no hello padding” *configured*.
> On the other hand, it seems like that isn't documented. Can anybody kindly
> point out for me (and probably, for the rest of the list) the correct
> documentation for that and if this is still relevant for modern IOS/IOS-XE
> versions?
> 
> 
>  Thank you.
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