I'm not specifically walking the entire tree, but I see the same symptoms when I do walk the entire tree.
This is on a set of 2 SG500-52P's stacked as a single manageable unit. I'm walking the PoE power usage tree in order to obtain the total PoE power usage for the entire stack. It takes about 15-20 seconds to complete this walk, during which time it seems other snmpget requests for other metrics (port bandwith, etc) are delayed and/or blocked until it is done.
Can the SG's only hangle one snmp session at a time?
The stack is pretty much fully populated with copper links and 3 fiber links. All at 1 Gb/s. A few LAG groups are setup as well.
The CPU usage on the stack as seen through the web interface is low even when the snmpwalk is timing out.
I've only had this issue on the SG series of switches. Any other cisco product (true IOS product) snmpwalk is blazing fast. I've done this same thing on catalysts with higher port density with no issues at all.
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