Experimental Physics and Industrial Control System
Subject: |
Why do I need to prevent looping when deploying CA gateway |
From: |
"Wang, Lin" <[email protected]> |
To: |
[email protected] |
Date: |
Mon, 24 Jul 2017 23:43:18 +0800 (GMT+08:00) |
Dear all,
When I was deploying CA gateways for our facility recently according the users guide [1], I was confused about the motivation for preventing looping mentioned in the document. Does CA gateway looping affect anything? Will CA gateways work improperly when looping happens?
For example, when I create two CA gateways (gateway1 and gateway2) in one PC with eth0 and eth1 connecting to NetA and NetB respectively. Gateway1 binds eth0 as CA server IP and adds eth1/NetB to EPICS_CA_ADDR_LIST, whereas gateway2 binds eth1 as CA server IP and adds eth0/NetA to EPICS_CA_ADDR_LIST. This way, there is a loop and the internal PVs inside both gateway1 and gateway2 can be accessed from both NetA and NetB. However, I cannot see anything abnormal, the two CA gateways still work properly. Even if I capture UDP/TCP packets using Wireshark with cashark plugin, I still cannot see excessive packets.
Any hints or answers are appreciated. Thanks.
Lin
[1] http://www.aps.anl.gov/epics/EpicsDocumentation/ExtensionsManuals/Gateway/Gateway.html
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