[c-nsp] show isis neighbors - system id shown

[Robert Raszuk]

>   is there a reason why ?

Looks to me like you are pretty fast in repetitive show commands :)

What actually may be happening here is that adj. comes up fast and at this
point your router does not yet have the dynamic name. After some time it
receives it from the neighbor via flooding in TLV 137 and then creates a
mapping hence in subsequent commands you see the name.

Works as designed :)  Flooding that TLV may take a bit of time as well as
your local system may not treat it as top important info.

Ref: Original Henk's RFC 2763 later replaced by RFC 5301

Best,
R.


On Sun, Feb 2, 2020 at 4:22 PM Aaron Gould <aaron1 at gvtc.com> wrote:

> funny, for a moment there it actually displayed the sys id of r1 instead of
> the word "r1"
>
>
>
> is there a reason why ?
>
>
>
> r2#sh isis neighbors
>
>
>
> System Id      Type Interface IP Address      State Holdtime Circuit Id
>
> 1111.1111.1111 L1   Fa0/0     1.2.3.1         UP    23       r2.01
>
> 1111.1111.1111 L2   Fa0/0     1.2.3.1         UP    24       r2.01
>
>
>
> r2#sh isis neighbors
>
>
>
> System Id      Type Interface IP Address      State Holdtime Circuit Id
>
> r1             L1   Fa0/0     1.2.3.1         UP    27       r2.01
>
> r1             L2   Fa0/0     1.2.3.1         UP    28       r2.01
>
> r2#sh isis neighbors
>
>
>
> System Id      Type Interface IP Address      State Holdtime Circuit Id
>
> r1             L1   Fa0/0     1.2.3.1         UP    23       r2.01
>
> r1             L2   Fa0/0     1.2.3.1         UP    24       r2.01
>
> r2#sh isis neighbors
>
>
>
> System Id      Type Interface IP Address      State Holdtime Circuit Id
>
> r1             L1   Fa0/0     1.2.3.1         UP    22       r2.01
>
> r1             L2   Fa0/0     1.2.3.1         UP    23       r2.01
>
> r2#sh isis neighbors
>
>
>
> System Id      Type Interface IP Address      State Holdtime Circuit Id
>
> r1             L1   Fa0/0     1.2.3.1         UP    21       r2.01
>
> r1             L2   Fa0/0     1.2.3.1         UP    22       r2.01
>
> r2#
>
>
>
> -Aaron
>
>
>
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