On Junos QFX5100 and EX4600 platforms in Layer 2 Virtual Private Network (L2VPN) scenarios, when an access port flaps or the port related configuration is deactivated and activated, the traffic ingressing or egressing out of that port gets dropped.

This happens because of the failure of re-configuration of the access side port in the Packet Forwarding Engine (PFE).

The following syslog messages can be seen when this issue is hit [<date> <time> LOG: Err] PFE_ERROR_FAIL_OPERATION: proto ccc,len 0 prefix default nh 131488 [<date> <time> LOG: Err] PFE_ERROR_FAIL_OPERATION: route process failed [<date> <time> LOG: Err] brcm_rt_ccc_eth_vpws_vpn_uni_port_add:1503UNI VPWS port_add failed AC-IFL: 1023 VPN: 20138 (-15:Invalid configuration) [<date> <time> LOG: Err] brcm_rt_ccc_eth_vpws_hw_create:1825brcm_rt_ccc_eth_vpws_vpn_uni_port_add failed, status: 1000 [<date> <time> LOG: Err] brcm_rt_ccc_entry_install:952PW HW setup failed - RT:default NHID:131489 Err:1000 [<date> <time> LOG: Err] brcm_rt_ccc_entry_create:2486Failed to install the RT entry (status: 1000) [<date> <time> LOG: Err] PFE_ERROR_FAIL_OPERATION: rt_halp_vectors->rt_create failed

This issue might be seen if the following conditions are met:* On Junos QFX5100 and EX4600 platforms* L2VPN Scenarios (L2circuit & VPWS)* L2VPN access port flap or configuration is deactivated and activated

Issue is resolved in 20.4R3-S10 junos:21.4R3-S6 and subsequent releases.