Cisco Bug: CSCvs15759 - DHCP server sends out a NAK packet during DHCP renewal process.
Jan 17, 2020
- Cisco Catalyst 9300 Series Switches
Known Affected Releases
Symptom: During DHCP renewal process at 50% of the lease timer, Polaris device based DHCP servers are responding with a DHCP NAK instead of an ACK. This is causing devices to loose connectivity for microseconds and causing issues for some customers. 48 30.843586 126.96.36.199 -> 255.255.255.255 DHCP 345 DHCP Offer - Transaction ID 0x1b66 49 30.845645 0.0.0.0 -> 255.255.255.255 DHCP 358 DHCP Request - Transaction ID 0x1b66 50 30.846981 188.8.131.52 -> 255.255.255.255 DHCP 345 DHCP ACK - Transaction ID 0x1b66 189 216.118317 184.108.40.206 -> 220.127.116.11 DHCP 346 DHCP Request - Transaction ID 0x1b66 190 216.119289 18.104.22.168 -> 255.255.255.255 DHCP 342 DHCP NAK - Transaction ID 0x1b66 Conditions: Device Running Polaris code DHCP Server config- ip dhcp use subscriber-id client-id ip dhcp subscriber-id interface-name ip dhcp excluded-address 22.214.171.124 ip dhcp ping packets 1 ip dhcp pool 0 network 126.96.36.199 255.255.255.0 lease 0 0 6 class-map match-any system-cpp-police-dhcp-snooping description DHCP snooping ip address dhcp
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