Is it VTP problome ?

[katab]

* I'm using cat 29500 (S2) in one location which connected to another cat 29500 (S1) using fiber and this one connected to cat 5500.

* I can access S1 using telnet but I can't access S2 and there is no replay when I use ping command to ping S2

* when conneted directly to S2 I can ping and

access S1 .

I check IP , Subnet it was ok.

* Link S2-S1 goes trunk although I'm not using

VLANs or VTP.

* I check the VTP I found both of them in

Domain Name : Cisco

Mode : Server

Version : 2

* I delete VTP.dat file using (delete flash:VTP.dat)

I save the change but when the switch is reboot the file was there with the old configurations.

* Some thing else that when any of S1 or S1 rebooted I can login to S2 using telnet 'if I login immediately when switch is up' but after closing the session I can't do it again.

Please help solving this issue .

[milan.kulik]

Hi,

read http://www.cisco.com/warp/customer/473/103.html#vlan_trunking_protocol

and http://www.cisco.com/warp/customer/473/21.html to understand VTP details.

"* Link S2-S1 goes trunk although I'm not using VLANs or VTP. "

Cat2950 are negotiating trunking on any port by default (use sh int fa 0/x switchport to see details).

" I save the change but when the switch is reboot the file was there with the old configurations."

When boths switches are VTP servers, the switch receives the VLAN info via VTP from the other server after reboot, probably. Some latest 2950 IOSes are also writing VLAN info into the config - check it.

To your Telnet problem:

Are you using int VLAN1 for switch management on both 2950s?

Are you able to Telnet locally (i.e. form a PC connected to the S2)?

If yes, the problem is probably on the trunk.

If not, check the IP configuration on S2 int VLAN1.

Regards,

Milan

[#3]

maybe your vlan1 is shut down

#sh run

look your vlan 1

if is then

(config)int vlan 1

(config-if)no sh

[nstathak]

I doubt its a VTP problem.

1st. Manually configure all ports to vlan 1 (no turnking) on any port

2nd. Configure both switch mgmt int vlan 1 in the same subnet.

3rd. Check interface's up/up, and vlan up/up

3rd. Ping the switches, and see what happens.

If this fails then you have other issues.

nick