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Cisco Bug: CSCur22408 - umbrella smu for 4.3.4 dhcp issue

Last Modified

May 10, 2018

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.4.BASE

Description (partial)

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
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