[c-nsp] IOS-XR accepted duplicate subnet configurations for interface

[Saku Ytti]

On Thu, 27 Sep 2018 at 10:24, Rimestad, Steinar
<Steinar.Rimestad at altibox.no> wrote:

> As long as the l2 encapsulation is different the syntax is allowed even without vrf and as primary addresses.
> You get a warning in the syslog and one of the addresses with the duplicate config is forced down.
> Sep 27 09:13:09.372 : ipv4_arm[292]: %IP-IP_ARM-3-CFLCT_FORCED_DOWN : The IPv4 address 10.11.12.1/31 on Bundle-Ether100.2177 conflicts with other IPv4 addresses and has been forced down
>
> You can check for any conflicts using "show arm conflicts".

Just as side note there is DDTS where if you have say loop0 multiple
times, and you delete some of those, the loop0 may disappear from ARM
database entirely. Luckily impact isn't catastrophic, mostly just SNMP
issues and can be recovered runtime without inteerruption by
restarting ARM database.

But perhaps better not to have same IP multiple times, there be
dragons in corner cases.

-- 
  ++ytti