On 4/30/2018 9:46 AM, Stephen Satchell wrote:
I've worked with APC, Synaccess, and a couple other brands of power
controllers. One constant: the IP stack implementations tend to be a
bit fragile. This is not restricted to power controllers; I have a GPS
NTP appliance that is affected by the same sorts of things.
I'll stick with APC and Synaccess, because I currently work with those.
You want to avoid presenting these conditions to the embedded stack:
1. ARP storms
2. Lots of layer 2 and layer 3 broadcast traffic
3. Probes for ports not implemented in the stack
4. Too much traffic (SNMP in particular)
I like keeping all such devices on a single management VLAN dedicated to
embedded-stack devices. The Ethernet hardware tends to be competent at
filtering packets not intended for the device, so you don't have to go
overboard with VLANs. It's the software behind the hardware that is
easy to overwhelm if you throw too many packets at it.
(But you knew this already)
In particular, if at all possible, do not use the AP9606 era cards with
the APCs. They are 10BaseT and take fragile to a whole new level. I
usually have to manually force the port to 10 on the switch or put it on
a cheap dumb older switch.
The 961X series is 100BaseT and somewhat less temperamental.
--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org
