Models: ECS4620 series, ECS4510 series, ECS4120 series, ECS4100 series, ECS4110 series, ECS4210 series, ECS3510-28T/52T, ES3528Mv2, ES3510MA, ECS2100 series
When users try to get the current operational state of the interface by SNMP, the OID should be ifOperStatus (126.96.36.199.188.8.131.52.1.8).
There are two kind of results, "lowerLayerDown(7)" and "down(2)".
IF-MIB::ifOperStatus.25 = INTEGER: lowerLayerDown(7)
IF-MIB::ifOperStatus.1001 = INTEGER: down(2)
What's the difference between "lowerLayerDown" and "down" status?
(1) lowerLayerDown: If "operstatus" is not able to change to UP, and the cause is due to PHY link is down, it will display lowerlayerdown.
For example, no cable connected or admin down/manual shutdown. (In current design, it will shut down PHY) or shut down by the specific functions below.
(2) down: If the operstatus is not able to change to UP and the cause is NOT due to the PHY link is down, it will display down.
For example, vlan adminstatus down.
Console#sh ip int
VLAN 1 is Administrative Up - Link Down
Address is CC-37-AB-94-80-20
Index: 1001, MTU: 1500
Address Mode is User specified
IP Address: 192.168.2.10 Mask: 255.255.255.0
Proxy ARP is disabled
DHCP Client Vendor Class ID (text): ECS2100-10T
DHCP Relay Server: