ISR4331 not adding static route in RIB after first reload - IOS XE 16.6.2

[Support07]

Hi,

The problem occurs with ISR4331 on version 16.6.2, when you configure for the 1st time the ISR out of box, loading a configuration in the startup then reloading the router. The router won't add any static IP route who has for nexthop interface dialer XX

interface Dialer200

ip address negotiated

ppp authentication chap callin
ppp chap hostname xxxxxxx
ppp chap password xxxxxxx

so after the reload, wan link is connected, ppp session is UP, dialer has negotiated an IP,

in the config a static route is configured as follow : ip route 10.10.10.10 255.255.255.255 dialer 200

This route is not showed in the "show ip route "

Router#sh ip route 10.10.10.10 
% Network not in table

The only way to make it works, it's to type "show ip int brief" then  the ip route is added to the RIB :

Router#sh ip route 10.10.10.10 

Routing entry for 10.10.10.10/32
Known via "static", distance 1, metric 0 (connected)
Routing Descriptor Blocks:
* directly connected, via Dialer200
Route metric is 0, traffic share count is 1

Other workaround is to reload the router again after the 1st reload

It only happens at the first reload, as negotiated IP will always be the same for the router.

I searched in the release note IOS XE,  but I didn't find any caveat,

is it a known bug and is there a fix in a later version ?

Best Regards,

[Georg Pauwen]

Hello,

what happens if you configure:

ppp ipcp default route

on the Dialer interface ?

[Support07]

Hi, 

I didn't mention, but some of our configuration also use '' ppp ipcp default route'', and the behavior is the same as the static ip route, the default route is missing in the rib, till you type show ip int brief or reload 2nd time 

Thanks for your help

[Georg Pauwen]

Hello,

I checked for bugs, but could not find one related to this...

What if you add the 'permanent' keyword to the static route ?

ip route 10.10.10.10 255.255.255.255 dialer 200 permanent

[Support07]

Thanks, 

I will try it and let you know 

BR