Switching Issue.

jain.manish94 · ‎07-19-2016

Yesterday i was doing a practical in VTP but getting very big problem . how it is possible please tell me. it is correct or it is problem of my GNS and packet tracer.

1. One VTP server with xyz domain name.

2. Second VTP Client. with xyz domain name.

3. VTP Server revision no. was 10 .

4. VTP client revision no. was 16 .

Now problem was that VTP server received 16 revision no. from client and VLan information also and i had vlan 5 , vlan 6 in vtp server that also removed . now i have vlan 7 and vlan 8 only which was on vtp client

Please help regarding this.

InayathUlla Sharieff · ‎07-19-2016

Thats expected.

If your client revision number is higher than the server then the server will update its with that information. Thats the disaster of VTP due to which we recommend to be very carefull when connecting any new switch to the network were VTP is running fine.

Recommendation when connecting any new switch to the existing domain:-

change the vtp mode to transparent. ( This will have now config reve of 0)

Configure the vtp information

Change the vtp mode back to client.

Connect the switch to domain.

HTH

Regards

Inayath

InayathUlla Sharieff · ‎07-19-2016

See my network:

Server- f0/1------f0/1-----client

Before connecting the two switches:-

Server reve number is 9

client rev number is 13

outputs:-

show vtp st
VTP Version : 2
Configuration Revision : 4
Maximum VLANs supported locally : 1005
Number of existing VLANs : 9
VTP Operating Mode : Server
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled

Client:-

Client#
%SYS-5-CONFIG_I: Configured from console by console
show vtp st
VTP Version : 2
Configuration Revision : 8
Maximum VLANs supported locally : 1005
Number of existing VLANs : 13
VTP Operating Mode : Client
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled

I just connecte the link and made it as trunk now see the change on the server.

I lost the vlans configured on the Server and it got vlan database updated which was seen on client:-

erver#
%SYS-5-CONFIG_I: Configured from console by console
show vtp st
VTP Version : 2
Configuration Revision : 8
Maximum VLANs supported locally : 1005
Number of existing VLANs : 13
VTP Operating Mode : Server
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x33 0x5C 0xD3 0x15 0x5C 0xF0 0x60 0x84
Configuration last modified by 0.0.0.0 at 3-1-93 00:00:36

Regards

Inayath

jain.manish94 · ‎07-19-2016

thanks to share this information .

please can you tell me what troubleshooting mostly we get in VTP and HSRP or in VLAN.

InayathUlla Sharieff · ‎07-19-2016

Even though it seems as if a client should strictly listen to advertisements from servers,

a client can and does send out its own advertisements. When it first powers up, a client

sends a summary advertisement from its own stored database. It realizes that it has a

greater revision number if it receives an inferior advertisement from a server.

Therefore, it sends out a subset advertisement with the greater revision number,

which VTP servers will accept as more up-to-date information.

Troubleshooting:

=============

1- Make sure your config is good.

2- connecting any new switch to the existing domain make sure you check the revision number before connecting it.

3- HSRP :- Phyiscal connectivity should be reachable before configuring the hsrp .

4- Then it depends on what the issue TS should follow based on the error.

HTH

Regards

Inayath

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jain.manish94 · ‎07-19-2016

Please can you share more about hsrp troubleshooting..

InayathUlla Sharieff · ‎07-19-2016

http://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/10583-62.html

https://supportforums.cisco.com/discussion/11312306/hsrp-issue-both-routers-active

jain.manish94 · ‎07-24-2016

please can you tell me. i checked one my switch port on gi5/31 and why switch seeing itself on this port.

InayathUlla Sharieff · ‎08-03-2016

sorry not sure what you are asking?

jain.manish94 · ‎08-03-2016

i just connect two router

r1's int gi1/0/1 --- 100 mbps speed ----- ko r2's int gi1/0/2 -- 1gbps

both are directly connected , will they communication or not. if no why .

Please reply your ans.

InayathUlla Sharieff · ‎08-04-2016

The connection should work fine.

jain.manish94 · ‎08-04-2016

did you do any practical for this because i did this in packet tracer not working ..