05-17-2012 10:37 AM - edited 03-07-2019 06:45 AM
Hi All,
Secinario : PC1 -- SW1 -- SW2 -- SW 3 -- PC2
SW1 - Server , SW2- Trans , SW3- Client
Vlan - 10,20 on swithces.
1) I have created SW1 - Server , SW2- Trans , SW3- Client & created Vl 10,20 on SW1 but not updating Vlan on SW3- client Switch. ??? why ?? might be bcoz of SW2 is trans mode !!! it should bcoz SW2 will not update it's own DB but pass that info to other client SW's.
2) What I did , just change the mode on SW2 - trans to Client & working fine.& able to ping Pc1 to PC2 !!!! ???
3) Again , I changed that mode back to Trans mode on SW2. still I can ping Pc1 to PC2 !!!! Bcoz, I can see Vl 10 & 20 in that Vlan DB in trans mode.
4) Now, just removed , Vl 10 , 20 from SW2 - trans mode & not able to ping Pc1 to PC2 !!!!
Can any one please explain briefly on it ??? why it' happening ??
Thanks in advance..
Thanks,
Raj
Solved! Go to Solution.
05-17-2012 11:51 AM
Because you are using Sw2 as a transit vlan between server and client switches. If you delete 10,20 on Sw2 the switch has no way to tag the data from those vlans across the trunks . It thus gets dropped on the floor. The vlan database and what is allowed across the trunks are 2 different things.
You still have to manually create those vlans on Sw 2 if you want traffic to flow between Sw1 and 3 .
05-17-2012 12:21 PM
Raj, as i said earlier u need necessary vlan definitions if applicable (in ur case 10,20) on all ur switches including ur transparent switch, to allow transiting for vlan 10 and 20 on ur SW2 trunks.
Manualy create vlan 10 n 20 on SW2 n there u go.
now rate me LOL.
Soroush.
05-17-2012 11:00 AM
Hi,
Things to Check;
VTP Domain , VTP Password, VTP Version, necessary vlan definitions if applicable (in ur case 10,20).
also check your revision number on SW3 ** < important > ** switch# show vtp status
cheerZ
plz rate if helped,
Soroush.
05-17-2012 11:37 AM
Hi,
Thanks for reply. Here is the config. Please advice !!! a
--------------------------------------------------------------------
SW__1__(config)#do sh vt sta
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : ABC
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xFB 0x53 0x04 0x9F 0xA9 0x96 0xE1 0x60
Configuration last modified by 0.0.0.0 at 3-1-93 00:01:57
SW__2__(config)#do sh vt sta
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 5
VTP Operating Mode : Transparent
VTP Domain Name : ABC
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xFB 0x53 0x04 0x9F 0xA9 0x96 0xE1 0x60
Configuration last modified by 0.0.0.0 at 3-1-93 00:01:57
SW__2__(config)#
SW__3__(config)#do sh vtp sta
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Client
VTP Domain Name : ABC
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xFB 0x53 0x04 0x9F 0xA9 0x96 0xE1 0x60
Configuration last modified by 0.0.0.0 at 3-1-93 00:01:57
SW__3__(config)#
===================================
SW__1__(config)#do sh vl
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/2, Fa0/3, Fa0/4, Fa0/5
Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14, Fa0/15, Fa0/16, Fa0/17
Fa0/18, Fa0/19, Fa0/20, Fa0/21
Fa0/22, Fa0/23, Fa0/24, Gig1/1
Gig1/2
10 HR active
20 ACC active
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 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
===============================================================
SW__2__(config)#
SW__2__(config)#do sh vl
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/3, Fa0/4, Fa0/5, Fa0/6
Fa0/7, Fa0/8, Fa0/9, Fa0/10
Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/15, Fa0/16, Fa0/17, Fa0/18
Fa0/19, Fa0/20, Fa0/21, Fa0/22
Fa0/23, Fa0/24, Gig1/1, Gig1/2
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 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
====================================================
SW__3__(config)#do sh vl
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/2, Fa0/3, Fa0/4, Fa0/5
Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14, Fa0/15, Fa0/16, Fa0/17
Fa0/18, Fa0/19, Fa0/20, Fa0/21
Fa0/22, Fa0/23, Fa0/24, Gig1/1
Gig1/2
10 HR active
20 ACC active
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 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
Remote SPAN VLANs
------------------------------------------------------------------------------
====================================================
05-17-2012 12:21 PM
Raj, as i said earlier u need necessary vlan definitions if applicable (in ur case 10,20) on all ur switches including ur transparent switch, to allow transiting for vlan 10 and 20 on ur SW2 trunks.
Manualy create vlan 10 n 20 on SW2 n there u go.
now rate me LOL.
Soroush.
05-17-2012 02:22 PM
Soroushm ...
Done.. ...
Thanks .. see u soon ..
Cheers !!
05-17-2012 11:51 AM
Because you are using Sw2 as a transit vlan between server and client switches. If you delete 10,20 on Sw2 the switch has no way to tag the data from those vlans across the trunks . It thus gets dropped on the floor. The vlan database and what is allowed across the trunks are 2 different things.
You still have to manually create those vlans on Sw 2 if you want traffic to flow between Sw1 and 3 .
05-17-2012 02:23 PM
Glen.Grant...
Thanks a lot .. ... cheers !!
05-17-2012 12:18 PM
Hi,
Try to put VTP version to 2 on all your switchs.
the command if you don't remember : "vtp version 2"
I remember something about switch in transparent mode doesn't forward when they are in version 1
For the ping problem, glen.grant gave the answer
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