Let me do it practically to clear few points........
just booted one GNS3 switch..
SW1#sh vtp st
SW1#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 36
Number of existing VLANs : 5
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)
Let me see vlans
SW1#sh vlan-s
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1
Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------
------
1 enet 100001 1500 - - - - - 1002 1003
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
SW1#
SW1#
Contents of flash
SW1#sh flash:
System CompactFlash directory:
No files in System CompactFlash
[0 bytes used, 67108860 available, 67108860 total]
65536K bytes of ATA System CompactFlash (Read/Write)
Let me change the mode from server to Transparent
SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#vtp
SW1(config)#vtp mo
SW1(config)#vtp mode tr
SW1(config)#vtp mode transparent
Setting device to VTP TRANSPARENT mode.
SW1(config)#
SW1(config)#
verifications:
SW1(config)#do sh vtp st
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 36
Number of existing VLANs : 5
VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Lets see vlans
SW1(config)#do sh vlan-s
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1
Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------
------
1 enet 100001 1500 - - - - - 1002 1003
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
Now i will create some vlans in transparent mode
SW1(config)#vlan 2-10
SW1(config-vlan)#exit
Verifications
SW1(config)#do sh vlan-s
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
5 VLAN0005 active
6 VLAN0006 active
7 VLAN0007 active
8 VLAN0008 active
9 VLAN0009 active
10 VLAN0010 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
and
SW1(config)#do sh vtp st
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 36
Number of existing VLANs : 14
VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x54 0x21 0xDB 0x1B 0x90 0xD6 0x17 0xA9
Configuration last modified by 0.0.0.0 at 3-1-02 00:01:46
So vlans are being created successfully. But it should be interesting to see
contents of flash
SW1(config)#do sh flash:
System CompactFlash directory:
File Length Name/status
1 600 vlan.dat [deleted]
2 1140 vlan.dat
[1868 bytes used, 67106992 available, 67108860 total]
65536K bytes of ATA System CompactFlash (Read/Write)
we can see clearly that a vlan.dat file is being created. Although we know
that for transparent mode vlan configs are saved into startup config but a
backup copy of vlan.dat file is also created.
lets copy run start and reboot to see what happens.......
We are back after a reload......
SW1>en
SW1#sh vtp
SW1#sh vtp st
SW1#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 36
Number of existing VLANs : 14
VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x54 0x21 0xDB 0x1B 0x90 0xD6 0x17 0xA9
Configuration last modified by 0.0.0.0 at 3-1-02 00:00:06
our mod is transparent and we have all vlans......
SW1#sh vlan-switch
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
5 VLAN0005 active
6 VLAN0006 active
7 VLAN0007 active
8 VLAN0008 active
9 VLAN0009 active
10 VLAN0010 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
But contents of flash are quite interesting.......
SW1#sh flash:
System CompactFlash directory:
File Length Name/status
1 600 vlan.dat [deleted]
2 1140 vlan.dat [deleted]
3 1140 vlan.dat
[3072 bytes used, 67105788 available, 67108860 total]
65536K bytes of ATA System CompactFlash (Read/Write)
Number of deleted vlan.dat files has increased by one.... :)
Lets change mode from transparent to Client.
SW1(config)#vtp mode client
Setting device to VTP CLIENT mode.
SW1(config)#do wr
Building configuration...
[OK]
Lets see what happened to configuration level created vlans
SW1(config)#do sh run | inc vlan
we dont get any thing,... IOS removed vlans from config, but also updated
vlan.dat file
SW1(config)#do sh flash:
System CompactFlash directory:
File Length Name/status
1 600 vlan.dat [deleted]
2 1140 vlan.dat [deleted]
3 1140 vlan.dat [deleted]
4 1140 vlan.dat
[4276 bytes used, 67104584 available, 67108860 total]
65536K bytes of ATA System CompactFlash (Read/Write)
one more deleted vlan.dat file but new file size is same as old file. So it
means vlan.dat file still holds all vlans in flash: Lets prove it.
SW1(config)#do sh vlan-s
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
5 VLAN0005 active
6 VLAN0006 active
7 VLAN0007 active
8 VLAN0008 active
9 VLAN0009 active
10 VLAN0010 active
woo... vlans are still there... May be some thing is wrong. Lets reboot the
device and see what is next...... Not to forget that we already have saved
running configurations.
We are back after reboot and we can see vlans stay there for ever.
SW1#sh vlan-s
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13, Fa1/14,
Fa1/15
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
5 VLAN0005 active
6 VLAN0006 active
7 VLAN0007 active
8 VLAN0008 active
9 VLAN0009 active
10 VLAN0010 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
and contents of flash still hold their place.....
SW1#sh flash:
System CompactFlash directory:
File Length Name/status
1 600 vlan.dat [deleted]
2 1140 vlan.dat [deleted]
3 1140 vlan.dat [deleted]
4 1140 vlan.dat
[4276 bytes used, 67104584 available, 67108860 total]
65536K bytes of ATA System CompactFlash (Read/Write)
Moral: If switch (at least GNS3 emulated) has vlans in transparent mode and
when its converted to client mode it will "MIGRATE" vlans from running
config to vlan.dat file and these vlans will stay there.
HTH
On Wed, Dec 1, 2010 at 6:46 PM, Faisal Ilyas <faisal.learning_at_gmail.com>wrote:
> in the book ccie routing and switching 4th edition it says that if the
> switch is in transparent mode then the extended vlans are save in running
> config ...
>
> but i think if you make copy run start then it should be saved in startup
> config but are the extended vlans were not saved in vlan.dat file ???/
>
>
>
> On Wed, Dec 1, 2010 at 5:44 PM, Maarten Vervoorn <mr.vervoorn_at_gmail.com
> >wrote:
>
> > It store the vlan's in the vlan.dat
> > For example if you configure a client switch and this client received a
> > couple of VLANs from a VTP server it stores those in the vlan.dat. Even
> if
> > you configure the same client switch as transparent afterwards it remains
> it
> > vlans because it has stored them in the vlan.dat
> >
> > Kind regards,
> >
> > Maarten vervoorn
> >
> > 2010/12/1 Faisal Ilyas <faisal.learning_at_gmail.com>
> >
> >> Salam,
> >>
> >> I have a query that if i have a switch in transparent/server mode it
> will
> >> store the vlan information into vlan.dat file but if i make that same
> >> switch
> >> into VTP Client mode and it took the update from another vtp
> server/client
> >> switch depends on CR number but let suppose it gets the updates, so
> where
> >> that switch will save the vlan configuration, in running config or it
> will
> >> replace its own vlan.dat once it will get the updates ...
> >>
> >>
> >>
> >>
> >> --
> >> Regards,
> >> M. Faisal.
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> Regards,
> M. Faisal.
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
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Received on Wed Dec 01 2010 - 19:37:40 ART
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