What's the difference between "lowerLayerDown" and "down" status read by SNMP ?

Steven_zhang • Created at：Dec 11, 2019 13:16:20 • Updated at：Dec 11, 2019 13:16:25

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 (1.3.6.1.2.1.2.2.1.8).

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.

mceclip0.png

(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:
Console#


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