CCNA as well as CCNP possibilities who have their really own Cisco home labs customarily e-mail me about an peculiar state of affairs which occurs once they erase the switch’s configuration. Their startup pattern is gone, as they anticipate, however the VLAN as well as VTP interpretation is still there!
Sounds unusual, does not it? Let us take the demeanour during an example. On SW1, we run uncover vlan proxy as well as see in this shortened outlay which there have been 3 additional vlans in use:
SW1show vlan br
10 VLAN0010 energetic
20 VLAN0020 active
30 VLAN0030 active
We need to all erase the router’s startup configuration, so we have use of the write erase command, endorse it, as well as reload with out saving the operative config:
SW1write erase
Erasing the nvram filesystem will take divided all pattern information! Continue?
[confirm]
[OK]
Erase of nvram: full
00:06:00: %SYS-7-NV_BLOCK_INIT: Initalized the geometry of nvram
SW1reload
System pattern has been modified. Save? [yes/no]: n
Proceed with reload? [confirm]
The router reloads, as well as after exiting setup mode, we run uncover vlan short again. And even yet the startup pattern was erased, the vlans have been still there!
The eBay “Lingo”.
Switchshow vlan br
10 VLAN0010 lively
20 VLAN0020 active
30 VLAN0030 energetic
The reason being which this vlan as well as VTP interpretation is essentially kept inside of the VLAN.DAT record in Flash memory, as well as the essence of Flash have been kept upon the reload. The record needs to be deleted manually.
There’s the bit of pretence to deletion this file. The switch will evident we twice to ask if we essentially wish to do divided with this file. Don’t kind “y” or “sure”; only accept the defaults by attack the lapse key. In box we sort “y”, the router attempts to undo the record declared “y”, as shown here:
Switchdelete vlan.dat
Delete filename [vlan.dat]? y
Delete flash:y? [confirm]
%Error deletion flash:y (No such record or directory)
Switchdelete vlan.dat
Delete filename [vlan.dat]?
Delete flash:vlan.dat? [confirm]
Swap
The easiest approach to classify for CCNA as well as CCNP hearing success is by operative upon tangible Cisco tools, as well as by behaving lab duties over as well as over. Repetition is the mother of talent, as well as by essentially erasing your VLAN as well as VTP report by deletion the vlan.dat record from Flash, you’ll be constructing your Cisco skills to the role where your CCNA as well as CCNP hearing success is the certainty.
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