Guest

Preview Tool

Cisco Bug: CSCvv64331 - Duplicate DHCP leases cause rack server to go unavailable

Last Modified

Oct 22, 2020

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

4.0(2b)C

Description (partial)

Symptom:
-Rack servers / CIMC will go unavailable or inaccessible (may get errors/alerts for CIMC unreachable)
-Server discovery will fail due to no available DHCP leases
-Duplicate DHCPD lease entries (need to check DHCPD.leases file in either show-tech or /isan/etc/ )
-If all CIMC's go unreachable, HA will fail in a rack-only environment
-RSD_AG may core due to no available DHCP entries

Checking the svc_sam_rsdAG logs, we should have a similar output like:

[WARN][0x73d9fb90][Sep  5 09:47:10.087][app_sam_rsdAG:connect_] Unable to connect to DHCP daemon: no more
[WARN][0x73d9fb90][Sep  5 09:47:12.087][app_sam_rsdAG:connect_] Unable to connect to DHCP daemon: no more
[WARN][0x73d9fb90][Sep  5 09:47:14.087][app_sam_rsdAG:connect_] Unable to connect to DHCP daemon: no more
[WARN][0x73d9fb90][Sep  5 09:47:16.088][app_sam_rsdAG:connect_] Unable to connect to DHCP daemon: no more
[WARN][0x73d9fb90][Sep  5 09:47:18.088][app_sam_rsdAG:connect_] Unable to connect to DHCP daemon: no more

Conditions:
Observed in a rack-only environment, but may be applicable to mixed environments. 

6248 Fabric Interconnects
UCS C240 M4 Servers
N2K-C2232PP-10GE FEX
UCSM version 4.0(2b)
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.