General

Umbrella ddts for 4.3.4 dhcp issue : CSCun21356 low cps rate observed when large number of circuit id config CSCur13886 l2fib dhcp binding inconsistent between nodes/LC

Symptom

1.Low CPS rate observed when DHCP clients are coming up with diffrent circuit-ids. 2. ASR9K used with l2vpn bridge-domain , BVI, dhcp snooping and IP source guard Some l2fib dhcp binding are no present on some linecards although binding exist globally. This would cause packets for the missing bindings to be dropped on the ingress line card.

Conditions

1. When DHCP clients are coming up with diffrent circuit-ids and lease limit is set 2. Have more than 4000 dhcp binding entries and either LC reload occurs or l2fib_mgr restart

Workaround

1. No Workaround 2. remove and add back ip source guard each on L2VPN ac subinterface with 1min time gap

Further Problem Description