I have a Juniper EX2200 switch running JunOS 10.4R4.5.
Under Configure -> System Properties -> Management Access, I can configure which interface allow management access. There is a mystery interface call jsrv.1.
jsrv.1 is not listed in the configuration anywhere. It does not show up on this list of Juniper interface names. I cannot find an explicit mention of what this interface is used for online, although I see it in other people's show interfaces output.
What is this interface and what is it used for?
EDIT: We upgraded the EX2200 switches to JunOS 12.3R3.4 and the Jsrv.1 interface is gone now. There is only "me" and "lo" now.
Best Answer
Interface
jsrv.1
is always associated to IP address128.0.0.127
.An archive at SourceForge has the below command output snippet that shows a connection between
128.0.0.127
and port6343
(sFlow port)1:There is a Juniper Knowledge Center (cached google link) article that indicates there are 2 separate programs supporting the sFlow function, an agent and a collector.
The
jsrv
interface appears to be a built-in Juniper sFlow sub-system that allows communication between the internal collector and agent.1Note, this is the only connection to 128.0.0.127 I've been able to locate.