It's a well-known "feature" that interface ifindex value will change after certain JUNOS upgrades. However, the same problem is present when one reboots Juniper device- some interfaces will change ifindex value. I have heard it happens with M40, MX960, M7i, with newer switches and probably with other platforms as well and with variety of JUNOS versions . As ifindex value has to be persistent in order to use it for SNMP based monitoring solutions(for example Nagios), this is a very annoying problem. In Cisco IOS, there is a command "snmp-server ifindex persist"(http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080134eec.shtml), which tells IOS to keep ifindex value unchanged even after reboot. In JUNOS, as far as I know, something like this should be built in by design as there is a file /var/db/dcd.snmp_ix, where all the ifindex values are mapped. As /var is mounted to /dev/adX, it should survive reboot. However, still sometimes ifindex values are changed! Any experience/comments with this issue? As this behavior has been present for years, is there finally some sort of fix or workaround other than monitoring based on interface names?
WBR, Martin _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
