07-02-2009 08:35 PM - edited 03-06-2019 06:34 AM
Dear Sir,
i'm working with 2 cisco 3750 G series switches.testing bed is as follows:-
1) 2 different VLANs are working in both switch.
2) Trunk port is enabled.
3)2 vlans are working fine in each switch and communicating to each other well.
4) When i connect trunk port through a crossover cable,all ports of one swtch( which configured as vtp client)go DOWN and it never UP.
Again i have to reset switch and configure.
I have two questions:-
1) Why all ports go down when i connect crossover cable in trunk ports in both switches.
2) Is it necessary to configure one switch as a vtp client and one as a server.
a)If i will use both switches as vtp server, then what happened?
b)If i will not configured vtp domain SAME in both switches, then what happened.
Regards,
Siddhartha
Solved! Go to Solution.
07-03-2009 10:22 PM
Hi Siddhartha,
What should i have to do if i will configure "vtp server" on both switches?
There are a significant few of us who will caution you with this. I have witnessed the danger and damaged when a long list of VLANs were deleted because a new switch, configured as VTP Mode Server, was attached to the network. Use this method with extreme caution and prejudice.
07-06-2009 10:42 PM
Hi~ siddindia
I prepared a simple example that I didn't test below lap.
However, I believe that it will be up and run.
â» Additional configuration.
1. Etherchannel configuration.
- Because of 2 lines(1/0/23-24)
â» Deleted configuration.
1. Routing configuration.
- If you have only just this lab, it isn't necessary to communicate the data between the SW1 and the SW2.
switch-1
================================================
switch(config)#vlan 100
switch(config-vlan)#name account
!
switch(config)#vlan 200
switch(config-vlan)#name hrd
!
switch(config)#int vlan 100
switch(config-if)# ip add 155.4.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 200
switch(config-if)# ip add 155.8.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 1
switch(config-if)# ip add 170.100.100.1 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int range gigabitethernet 1/0/1 - 12
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 100
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/13 - 21
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 200
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport
switch(config -if-range)#channel-protocol pagp
switch(config -if-range)#channel-group 1 mode desirable
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation isl
switch(config -if-range)#no shut
!
switch(config)#vtp domain bel
switch(config)#vtp mode transparent
Switch-2
========================================================================
switch(config)#vlan 300
switch(config-vlan)#name mkt
!
switch(config)#vlan 400
switch(config-vlan)#name business
!
switch(config)#int vlan 300
switch(config-if)# ip add 155.5.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 400
switch(config-if)# ip add 155.4.8.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 1
switch(config-if)# ip add 170.100.100.2 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int range gigabitethernet 1/0/1 - 12
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 300
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/13 - 21
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 400
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport
switch(config -if-range)#channel-protocol pagp
switch(config -if-range)#channel-group 1 mode desirable
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation isl
switch(config -if-range)#no shut
!
switch(config)#vtp domain bel
switch(config)#vtp mode transparent
07-07-2009 03:42 PM
Good morning! Siddhartha
In my configuration scenario, I'm clearly sure that all VLANs will be communicated with each other without a dynamic routing.
If you want to use the dynamic routing,
Trunk configurations don't need anymore.
However several another configuration need in the SW1 and SW2.
Have a good day!
Regards,
Kwangwon
07-02-2009 08:42 PM
Switch 2 ...
You have VTP Mode CLIENT but you are creating VLAN 300 and VLAN 400. You can't "create" a VLAN when you are in this mode.
Please rate when applicable and/or helpful.
Hope this helps.
07-03-2009 12:01 AM
ok.
Then what i have to do? when i have to implement two vlans in each switch.
Regards,
Siddhartha
07-03-2009 02:36 AM
You need to do the following:
switch(config)#ip routing
switch(config)#vtp domain bel
switch(config)#vtp mode server
switch(config)#vtp password 1234
However before making the change make sure the VTP revision is higher than your other switch otherwise your other switch will overwrite your vlan's with one's that it is aware of. Additionally I would add the other vlan's on the other switch to this switch before connecting the two switches together.
If your other switch is configured as a VTP server. Then don't make the change I mentioned above. Instead add the vlan (vlan 400) to the other switch prior to connecting the switches together.
Please rate.
Dan
07-03-2009 03:01 AM
Thank Dan for your esteemed response.
But i'm really confused,in which switch what need to change for vlan communication in my senario(two different vlans in each switch). I need right help step by step.Please do needfull.Kindly answer my questions also in my previous post.
Regards,
Siddhartha
07-03-2009 03:05 AM
Can you run the command "show vtp status" on each switch and paste output here.
07-03-2009 03:28 AM
Sorry DAN,
i can not. setup is some other location, where problem is rising.
But i'm sure that i have not use-
"router(config)#version 2"
in vtp domain command.
Can i recover this problem with only use "router(config)#version 2" with vtp domain command in a switch?
Why all ports of other switch which is in this time configured as vtp client, goes down, when i connect trunk ports through crossover cable.
Regards,
Siddhartha
07-03-2009 07:04 PM
In VTP Server, you can create, save, delete VLANs.
In VTP Client, the switch can't create or save any new VLAN changes.
So in your situation, may I recommend you create, delete and make VLAN changes to Switch 1, which is running on VTP Mode Server?
Thanks.
07-03-2009 09:34 PM
ok..
It means, i have to create VLANs 100,200,300 and 400 in switch1(which is configured in "vtp server" mode) and applied on gigethernet ports which i want to take in VLANs 300 and 400.But, there is any requirement in to change in "dynamic routing" in any switch.
What should i have to do if i will configure "vtp server" on both switches?
One mmore confusion in my mind that why all ports go down in this condition(configuration is given in first posting.).
Regards,
Siddhartha
07-03-2009 10:22 PM
Hi Siddhartha,
What should i have to do if i will configure "vtp server" on both switches?
There are a significant few of us who will caution you with this. I have witnessed the danger and damaged when a long list of VLANs were deleted because a new switch, configured as VTP Mode Server, was attached to the network. Use this method with extreme caution and prejudice.
07-04-2009 03:37 PM
Hi Siddhartha,
I am happy to see we have solved your issues and thanks for the rating.
07-05-2009 09:53 PM
Whoopsie! Wrong post! :P
07-05-2009 11:13 PM
switch-1
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation dot1q
switch(config -if-range)#no shut
Switch-2
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation isl
switch(config -if-range)#no shut
!
Hi~ siddindia
First thing ,
Do you happend to know that the trunk have 2 protocols which are ISL and IEEE 802.1Q.
I think that you should configure the same protocol like "dot1q / dot1q" or "isl / isl"
I hope to solve your problem.
Regards,
Kwang won
07-06-2009 08:40 PM
Hi Kwang won,
encapsulation is differ in both swithces by mistake.You are absolutly right that same encryption should be in both side of switches.
What are thinking about my testing scenario:-
Two L3 switches with two different VLANs on each switch.Can you send me proper configuration specially VLANs and VTP at each switch?
You can take my configurations in my first post.
Regards,
Siddhartha
07-06-2009 10:42 PM
Hi~ siddindia
I prepared a simple example that I didn't test below lap.
However, I believe that it will be up and run.
â» Additional configuration.
1. Etherchannel configuration.
- Because of 2 lines(1/0/23-24)
â» Deleted configuration.
1. Routing configuration.
- If you have only just this lab, it isn't necessary to communicate the data between the SW1 and the SW2.
switch-1
================================================
switch(config)#vlan 100
switch(config-vlan)#name account
!
switch(config)#vlan 200
switch(config-vlan)#name hrd
!
switch(config)#int vlan 100
switch(config-if)# ip add 155.4.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 200
switch(config-if)# ip add 155.8.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 1
switch(config-if)# ip add 170.100.100.1 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int range gigabitethernet 1/0/1 - 12
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 100
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/13 - 21
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 200
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport
switch(config -if-range)#channel-protocol pagp
switch(config -if-range)#channel-group 1 mode desirable
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation isl
switch(config -if-range)#no shut
!
switch(config)#vtp domain bel
switch(config)#vtp mode transparent
Switch-2
========================================================================
switch(config)#vlan 300
switch(config-vlan)#name mkt
!
switch(config)#vlan 400
switch(config-vlan)#name business
!
switch(config)#int vlan 300
switch(config-if)# ip add 155.5.6.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 400
switch(config-if)# ip add 155.4.8.100 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int vlan 1
switch(config-if)# ip add 170.100.100.2 255.255.255.0
switch(config-if)#no shut
!
switch(config)#int range gigabitethernet 1/0/1 - 12
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 300
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/13 - 21
switch(config -if-range)#switchport mode access
switch(config -if-range)#switchport access vlan 400
switch(config -if-range)#no shut
!
switch(config)#int range gigabitethernet 1/0/23 - 24
switch(config -if-range)#switchport
switch(config -if-range)#channel-protocol pagp
switch(config -if-range)#channel-group 1 mode desirable
switch(config -if-range)#switchport mode trunk
switch(config -if-range)#switchport trunk encapsulation isl
switch(config -if-range)#no shut
!
switch(config)#vtp domain bel
switch(config)#vtp mode transparent
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