PCS routing probelm

[ismohamm]

Hi Experts,

I have weird problem withPCS in my network, I have ISIS network and every PCS is connected to local subnet and each subnet is attached to GW router.
suddenly I can not reach PCS from anywhere except from router attached to subnet, WA to solve this issue is to delete default router on PCS and create again or add static route and delete.

my conclusion is that PCS can't use its default GW defined in default route part and refresh needed to allow PCS to use again.

any idea anout source of that behaviour.

Thanks