In a new turn up, IRB interface was not pingable/reachable from peer device.

  irb {

       unit 0 {

           disable;

       }

       unit 99 {

           description :MGMT:::172.16.1.1;

           family inet {

               address 192.168.230.19/24;

           }

       }

   }

Unable to ping IRB ip address from the peer device.

When we verified we observed that there is PROTECT RE filter on loopback.

  lo0 {

       description PROTECT_RE_LOOPBACK;

       unit 0 {

           family inet {

               filter {

                   input TF_PROTECT-RE_4;

               }

           }

           family inet6 {

               filter {

                   input TF_PROTECT-RE_6;

               }

           }

       }

   }

Per above filter we observed that DISCARD term was in the middle of the filter rather than at the end which was blocking the pings.

We rectified the configs and fixed the issue.

Please verify any PROTECT_RE filter issues during such scenarios.