Re: [xcat-user] Understanding the BMC networking

Mon, 19 Mar 2018 19:30:28 -0700

Hi Kevin,
 
In xCAT discovery docs,  there are 2 subnets for recommended way of setting up a cluster with multiple networks to make discovery example easy.
 
1, In site table, you should configure master using xCAT MN ip in the provision network.
 
2, In networks table, here gives you 2 cases:
 
In case 1: if there are 2 subnets, one is for hardware control, one is for provision ip:
 
Hardware control network: 50.0.0.0/255.255.0.0 ——> you can assign 50.0.100.1-50.0.100.200 in the dynamicrange in networks table, this dynamicrange is for DHCP server during discovery, you can see 'tabdump -d networks'
Provision network: 10.0.0.0/255.0.0.0
 
You can add 2 networks entries in networks table, like:
“50_0_0_0-255_255_0_0”,”50.0.0.0”,”255.255.0.0”,,,,,,,,”50.0.100.1-50.0.100.200",,,,,,,,,
"10_0_0_0-255_0_0_0","10.0.0.0","255.0.0.0",,,,"<xcatmaster>",,,,,,,,,,,,,
 
In case 2: if there is only one network 50.0.0.0/16 for hardware control and provision ip, you can add dynamicrange in networks table during discovery process, after BMC is discovered and configured static ip, you can remove the dynamic range from the networks table in case it affects provision process.
 
Before and during discovery process, networks table:
 “50_0_0_0-255_255_0_0”,”50.0.0.0”,”255.255.0.0”,,,,"<xcatmaster>",,,,”50.0.100.1-50.0.100.200",,,,,,,,,
 
After discovery is finished, you should remove dynamic range from networks table:
“50_0_0_0-255_255_0_0”,”50.0.0.0”,”255.255.0.0”,,,,"<xcatmaster>",,,,,,,,,,,,,
 
3, After better understanding how configure site table and networks table, you can re-read the discovery doc to define the node based on the doc and have a try to discovery process, have a fun with it.
 
Best Regards
--------------------------------------------------
Yuan Bai (白媛)

CSTL HPC System Management Development
Tel:86-10-82451401
E-mail: by...@cn.ibm.com
Address: IBM ZGC Campus. Ring Building 28,
ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, Haidian District,
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IBM环宇大厦
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邮编:100193
 
 
----- Original message -----
From: Kevin Keane <kke...@sandiego.edu>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Cc:
Subject: [xcat-user] Understanding the BMC networking
Date: Tue, Mar 20, 2018 4:55 AM
 
Hi,
 
I'm trying to understand the recommended way of setting up a cluster with multiple networks.
 
Specifically, I note the recommendation that the BMC should have a static IP address *in a different subnet* from the node's main IP address, and also in a different subnet from the DHCP-assigned BMC address during discovery. Does that imply that the same physical network should have two, or even three, different subnets running on it?

http://xcat-docs.readthedocs.io/en/stable/guides/admin-guides/manage_clusters/ppc64le/discovery/mtms/discovery_using_defined.html
 
In this example, there are actually three subnets involved.
 
The DHCP server apparently serves the subnet 50.0.100.0/24
The BMC will be configured with a static IP on 50.0.101.0/24
And the node's IP will be on the 10.0.100.0/24 subnet.
 
Assuming that the BMC does not have a dedicated NIC, but is shared with the first NIC, how would I configure the various tables in xCAT?
 
It looks like I would need to touch the network table, the site table, and the node object for the management node?
 
Thanks!
 
--

_______________________________________________________________________
Kevin Keane | Systems Architect | University of San Diego ITS | kke...@sandiego.edu
Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | 619.260.6859

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