Cisco Bug: CSCus20438 - VEM losing connectivity to VSM due to vemdpa process going into a loop
Apr 06, 2018
- Cisco Nexus 1000V Switch for VMware vSphere
Known Affected Releases
Symptom: On the VSM: HH-NH11-SWW011# show mod Mod Ports Module-Type Model Status --- ----- -------------------------------- ------------------ ------------ 1 0 Virtual Supervisor Module Nexus1000V active * 2 0 Virtual Supervisor Module Nexus1000V ha-standby 3 1022 Virtual Ethernet Module NA offline 4 1022 Virtual Ethernet Module NA offline 6 1022 Virtual Ethernet Module NA offline 7 1022 Virtual Ethernet Module NA offline 8 1022 Virtual Ethernet Module NA ok 9 1022 Virtual Ethernet Module NA ok 10 1022 Virtual Ethernet Module NA offline <<================== On the VEM: ~ # vemcmd show card Card UUID type 2: 4c4c4544-0054-3110-8059-b5c04f375331 Card name: itnvs85008 Switch name: HH-NH11-SWW011 Switch alias: DvsPortset-0 Switch uuid: dd 05 32 50 14 52 d5 7e-13 d1 92 a2 15 1d 99 fb Card domain: 303 Card slot: 10 VEM Tunnel Mode: L2 Mode VEM Control (AIPC) MAC: 00:02:3d:11:2f:09 VEM Packet (Inband) MAC: 00:02:3d:21:2f:09 VEM Control Agent (DPA) MAC: 00:02:3d:41:2f:09 VEM SPAN MAC: 00:02:3d:31:2f:09 Primary VSM MAC : 00:02:3d:71:34:0c Primary VSM PKT MAC : 00:02:3d:71:34:0d Primary VSM MGMT MAC : 00:02:3d:71:34:0b Standby VSM CTRL MAC : 00:02:3d:71:34:8c Management IPv4 address: 10.95.226.93 Management IPv6 address: 0000:0000:0000:0000:0000:0000:0000:0000 Primary L3 Control IPv4 address: 10.72.128.244 Secondary VSM MAC : 00:00:00:00:00:00 Upgrade : Default Max physical ports: 32 Max virtual ports: 990 Card control VLAN: 3502 Card packet VLAN: 3503 Control type multicast: No Card Headless Mode : No <<================= DPA Status : Up Processors: 32 Processor Cores: 16 Processor Sockets: 2 Kernel Memory: 268421904 Port link-up delay: 5s Global UUFB: DISABLED Heartbeat Set: True Card Type: vem PC LB Algo: source-mac Datapath portset event in progress : no Licensed: Yes Global BPDU Guard: Disabled DP Initialized: Yes Tag Native VLAN: No L3Sec Mode: FALSE ~ # vem status -v Package vssnet-esxesx2013-release Version 184.108.40.206.1.1.0-3.2.1 Build 1 Date Fri Aug 15 00:22:33 PDT 2014 VEM modules are loaded Switch Name Num Ports Used Ports Configured Ports MTU Uplinks vSwitch0 5632 1 128 1500 DVS Name Num Ports Used Ports Configured Ports MTU Uplinks HH-NH11-SWW011 1024 52 1024 1500 vmnic5,vmnic3,vmnic2,vmnic1,vmnic0,vmnic4 VEM Agent (vemdpa) is running ~ # Conditions: Problem would happen if a Vtracker command or 'show interface virtual pinning' is issued around the same time Vmotion of a VM happens. In this scenario, there is a narrow window during which port gets cleaned up on the DP on source host, but hasn't been cleaned up yet on DPA as it is waiting for acknowledgement from the VSM. If the Vtracker or pinning show command were to be processed by DPA in this time interval, then it would be stuck in a loop because of the previously mentioned bug in the code. The 'show interface virtual pinning' command is also executed as part of 'show tech-support details' and 'show tech-support details interface'.
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