I can see that the VMI has no gateway configured, and is on a DHCP served address with a 172.16/16 network. The second HMC in another data center will only be able to communicate with that on a "stretched" VLAN, for example Cisco OTV or ACI stretched network.
Can the two HMCs ping each other on a 172.16 address? That is a pretty simple troubleshooting step to see if they actually are on the same network.
Are you using multiple HMC ports on the Power10 systems, or one address on one port for each?
Bottom line, if they are not on the same network, you are going to need a gateway address or a stretched configuration. Talk to your network team.
The postings on this site are my own and don't necessarily represent IBM's positions, strategies or opinions.
Original Message:
Sent: Thu April 06, 2023 04:39 AM
From: Andrey Klyachkin
Subject: HMC VMI connection to different LAN IP then HMC IP
Hi Vince,
I have both private HMC and VMI addresses in one VLAN and with IPs from the same network assigned by DHCP:
> lssysconn -r all | grep '9043-MRX\*SERIALNO'resource_type=sys,type_model_serial_num=9043-MRX*SERIALNO,sp_type=ebmc,ipaddr=172.16.222.43,user_name=admin,alt_ipaddr=unavailable,state=Connected,vmi_ipaddr=172.16.222.46,vmi_state=Connected> lssysconn -r vmi -m 9043-MRX*SERIALNOresource_type=vmi,type_model_serial_num=9043-MRX*SERIALNO,interface=eth1,ipv4addr=192.168.240.11,gateway=0.0.0.0,net_mask=255.255.128.0,ipv4addr_orig=dhcpresource_type=vmi,type_model_serial_num=9043-MRX*SERIALNO,interface=eth0,ipv4addr=172.16.222.46,gateway=0.0.0.0,net_mask=255.255.0.0,ipv4addr_orig=dhcp
As you can see they're both in 172.16.0.0/16.
To be honest - it is HMC V10R2M1040 (beta). But I don't remember any problems with earlier HMC V10 releases.
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Andrey Klyachkin
https://www.power-devops.com
Original Message:
Sent: Wed April 05, 2023 05:53 AM
From: Vincencio Michaelis
Subject: HMC VMI connection to different LAN IP then HMC IP
Hi
HMC and VMI must reside in different VLANs and of course different Subnet....this is something we found out when we did PoC of P10 with the HMC Code....so change and it will work
thx
vince
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Vincencio Michaelis
Original Message:
Sent: Tue April 04, 2023 10:38 AM
From: Vincent Greene
Subject: HMC VMI connection to different LAN IP then HMC IP
This is typical of a routing issue. My guess is that the Power system in data center 2 does not have the correct gateway set to be able to communicate to systems on a different network.
To correct, you will need to use a system on the 10.25.1 network (local to your System B) to connect to the ASMI interface (https://10.25.1.25) and change the gateway (or maybe subnet mask) for that system.
Another possibility is the same sort of configuration problem (subnet mask or gateway) on the HMC, or a firewall.
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Vincent Greene
IT Consultant
Technology Expert labs
IBM
Vincent.Greene@ibm.com
The postings on this site are my own and don't necessarily represent IBM's positions, strategies or opinions.
Original Message:
Sent: Fri March 31, 2023 09:34 AM
From: Joshua Burton
Subject: HMC VMI connection to different LAN IP then HMC IP
I get the different connection but if not the same LAN if they still connect. Here is an example of what we see
| HMC IP | VMI IP | System | Power 10 IP | Location P10 | |
| vHMC in data center 1 | 10.1.1.5 | 10.1.1.10 | System A | 10.1.1.25 | Data Center 1 | Works |
| vHMC in data center 1 | 10.1.1.5 | 10.1.1.11 | System B | 10.25.1.25 | Data Center 2 | Doesn't |
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Joshua Burton
Original Message:
Sent: Fri March 31, 2023 09:09 AM
From: HARIGANESH MURALIDHARAN
Subject: HMC VMI connection to different LAN IP then HMC IP
Hi Joshua,
VMI has 2 interfaces that HMC can connect to like FSP/BMC has 2 ports for HMC connection. You can configure the VMI interface such that the vHMC in your backup data center can connect to the VMI , similar to how IP is configured on BMC on the systems in the other data center. VMI IP can be configured from the HMC itself. Hope this helps.
Thanks.
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Hariganesh Muralidharan
Cognitive Systems Management Architecture
IBM
Original Message:
Sent: Fri March 31, 2023 08:53 AM
From: Joshua Burton
Subject: HMC VMI connection to different LAN IP then HMC IP
We recently got 4 new Power 10 systems with a new vHMC 10.2 We setup the vHMC with no issue and connected them to two Power 10 systems in our backup data center that the vHMC is in. However when we attempt to connect the vHMC to the other two Power 10 systems in our other data center the initial connection connects and gathers information like system name model and such but the the state no connection and will flash (Virtual Management Interface IP is not Reachable) Does anyone know can the VMI port not connect to power systems the system is on a different LAN then the HMC.
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Joshua Burton
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