What is SNMP ifIndex persist?
What is SNMP ifIndex persist?
The SNMP ifIndex persistence feature provides an interface index (ifIndex) value that is retained and used when the router reboots. The ifIndex value is a unique identifying number associated with a physical or logical interface.
What is VLAN ifIndex?
IfIndex is a unique identifying number associated with a physical or logical interface. The value for each interface must remain constant at least from one re-initialization of the entity’s network management system to the next re-initialization.”
How do I know if a VLAN is working?
Use the show vlan command to verify your VLAN configuration. This command displays all switchports and their associated VLAN as well as the VLAN status and some extra parameters that relate to Token Ring and FDDI trunks. You can use the show vlan id [vlan#] command to see information about a particular VLAN.
How do I know my VLAN?
To find your VLAN (on a Windows XP machine), go to “Start Menu”,then click the return (enter) key on your keyboard. This runs a command prompt. Type in “ipconfig” and hit return again. You will see your IP Address, your Subnet Mask and your Default Gateway.
What is the normal range of VLANs?
VLAN Ranges
| VLANs | Range | Usage |
|---|---|---|
| 1 | Normal | Cisco default. You can use this VLAN but you cannot delete it. |
| 2-1001 | Normal | For Ethernet VLANs; you can create, use, and delete these VLANs. |
| 1002-1005 | Normal | Cisco defaults for FDDI and Token Ring. You cannot delete VLANs 1002-1005. |
| 1006-4094 | Extended | For Ethernet VLANs only. |
What is the range of VLAN?
How many VLANs can you have?
4,094
Under IEEE 802.1Q, the maximum number of VLANs on a given Ethernet network is 4,094 (4,096 values provided by the 12-bit VID field minus reserved values at each end of the range, 0 and 4,095).
What is standard VLAN?
VLANs numbered from 1 to 1005 are considered as Standard VLANs and the VLANs range from 1006 to 4094 are considered as Extended VLANs. Extended VLANs are not stored in the vlan. The VLAN 0 is used when a device needs to send priority tagged frames but does not know in which particular VLAN it resides.
Can 2 VLANs have the same IP range?
The OSA-Express Layer 2 implementation allows the hosts to manage IP addresses and ARP cache, so it is possible to have a single guest LAN segment (or VSWITCH segment) where two different hosts use the same IP Address on different VLAN groups. …
How to enable or disable persistence in if-MIB?
The “snmp ifindex persistence” interface configuration command enables and disables ifIndex persistence for individual entries (corresponding to individual interfaces) in the ifIndex table of the IF-MIB.
What does persistence of ifindex mean in SNMP?
IfIndex persistence means that the mapping between the ifDescr (or ifName) object values and the ifIndex object values generated from the IF-MIB is retained across reboots. This feature is particularly useful for: SNMP: monitoring the interfaces counters. Netflow: reporting of the interface ifIndex.
How to enable ifindex persistence on an interface?
To globally enable ifindex values that are maintained across reboots, issue the snmp-server ifindex persist command in global configuration mode. The same command can be issued to enable ifIndex persistence only on a specific interface in the interface configuration mode.
What does persistence in ifDescr and ifindex mean?
IfIndex persistence means that the mapping between the ifDescr (or ifName) object values and the ifIndex object values generated from the IF-MIB is retained across reboots.