Losing routes when lost connectivity with controllers

[HernanSeijas4479]

Hi,

We have a couple of sites with sd-wan and we need that they stay connected to the corporate network much time as possible in case they lost connectivity with controllers.

We have changed  the keygen-interval to 2:00:00:00 and the OMP gracefull restart timer to 86400 seconds but we are losing the routes received from vSmart after 12hs that we lose connectivity with the controllers.

All controllers are in Internet and these sites have only MPLS connection to our network and they access Internet through corporate network and we need to keep these sites connected (keep routing table) to our corporate network in case we lose Internet connection in headquarters.

Is there a way to accomplish it?

[M02@rt37]

Hello @HernanSeijas4479,

Since your remote sites are connected via MPLS and lose Internet connectivity during the outage, you might need to explore adding a backup WAN connection (cellular backup for example) to the remote sites. This backup link can be used during Internet outages to maintain connectivity.

[HernanSeijas4479]

but there is no way to keep the routing information for more than 12hours?

regards

[Kanan Huseynli]

Hi,

increase OMP restart time and IPSEC rekey (it should be 2 times higher than graceful restart timer).

You can change OMP graceful restart time up to 7 days in OMP template of routers and vSmart.

Rekey interval can be changed in security template of routers.

https://www.cisco.com/c/en/us/td/docs/solutions/CVD/SDWAN/cisco-sdwan-design-guide.html#GracefulRestart

Note that, when you change the value, OMP session flaps thus TLOC routes flap and you will have temporary downtime due to BFD session lose.

https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-unicast-routing.html#concept_rjl_sc2_b3b

[HernanSeijas4479]

Hi,

I did it in cEgdes but they lost the routes after 12hs, should I have to do the same in vSmart?

[Kanan Huseynli]

To be honest, I don't see reason for vSmart. In background whether this mismatch affects or not - is not written anywhere and if I find time, I'll try to do tests.

But , better to increase on vSmarts as well. In any case, it does not have side effect.

[HernanSeijas4479]

I did all the recomendations but still losing routes after 12hs.

this is the config I have

omp

graceful-restart-timer 86400

and keygen-interval 2:00:00:00

This is the only message in the log exactly at 12hs of losing controllers and I lost routes

%Cisco-SDWAN-RTERA02903SD-OMPD-6-INFO-400007: Not using any policy and I lose the routes.

any idea what is missing?

[Kanan Huseynli]

Do you configure OMP via template?

Share entire OMP template from router and vsmart