Can't ping vlan gateways on master switch

[Muzzy011]

Hello All,

I have problem pinging VLAN's defined on master switch which is VTP master.

On switch itself, I can ping VLAN gateways, but on two connected switches, I can't.

Switches are connected through 1Gb SFP, ports are trunked on all 3, all VLAN's allowed.

Main switch is 3750 Lan base, other two switches are 3750 IP Base

How I set trunks - same for all 3, different ports:

interface GigabitEthernet1/1/2
switchport trunk encapsulation dot1q
switchport mode trunk

VTP on master:

VTP Version capable             : 1 to 3
VTP version running             : 1
VTP Domain Name                 : Jordan
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 6c41.6a0f.0800
Configuration last modified by 10.1.5.254 at 5-7-11 11:25:49
Local updater ID is 10.1.5.254 on interface Vl1 (lowest numbered VLAN interface found)

Feature VLAN:
--------------
VTP Operating Mode                : Server
Maximum VLANs supported locally   : 255
Number of existing VLANs          : 8
Configuration Revision            : 1
MD5 digest                        : 0x50 0x5E 0xF5 0xFE 0xCC 0x94 0xD7 0xB6
                                    0xBA 0xFF 0x69 0x39 0x64 0xDF 0xD7 0x11

VTP on Client:

VTP Version capable             : 1 to 3
VTP version running             : 1
VTP Domain Name                 : Jordan
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 3c08.f6c7.a580
Configuration last modified by 10.1.5.254 at 5-7-11 11:25:49

Feature VLAN:
--------------
VTP Operating Mode                : Client
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 8
Configuration Revision            : 1
MD5 digest                        : 0x50 0x5E 0xF5 0xFE 0xCC 0x94 0xD7 0xB6
                                    0xBA 0xFF 0x69 0x39 0x64 0xDF 0xD7 0x11

VLAN's on master:

interface Vlan100
 description Jordan Company WiFi Interface
 ip address 10.100.10.1 255.255.255.0
!
interface Vlan125
 description Jordan Guest WiFi Interface
 ip address 10.125.26.1 255.255.255.0
 ip helper-address 10.1.5.5

Thanks,

Ivan.

[Dennis Mink]

what ip addresses have you configured on your connected switches, in what vlan and what is the default gateway?

[Muzzy011]

Main switch 10.1.5.254

Switch1 10.1.5.253

Switch2 10.1.5.252

All 3 are in VLAN1

Default gateway for main switch is router, 10.1.5.1, that connects with rest of the network.

Default gateway on Switch1 and Switch2 is main switch, 10.1.5.254

[balaji.bandi]

can you post the master switch configuration, 

post the putput from one of the switch not working, show vlan and uplink port configuration also.

[Muzzy011]

Ok, now is everything working, but I am not sure why it didnt before..

What I didnt changed - any port settings - all trunks are as they were

What I did changed - tried to disable VTP on Switch1 and Switch2, remove VLAN's left, went out of configuration, came back, set again VTP Domain, password, version (got told that they are already set in same way) and i set mode to client, went out of config, no change.

Then I changed of master switch following things: I removed default gateway that was pointing to router that connects with rest of the network, i turned on routing on switch, I set last resort routing to router that connects to rest of the network, i changed default gateway on Switch1 and Switch2 to point to master switch instead to router, saved everything, did save thing with VTP on Switch1 and Switch2 as I mentioned above, and still nothing..

When I tried traceroute to VLAN's on master switch, on Switch1 and Switch2, the first hop was not master switch but router, even though configurations were changed on both of them, and default gateway was pointing to master switch?

Then, this morning we lost power for a short period of time, all switches were on UPS so they were not restarted, Router got restarted, and somehow one of 2 VLAN's started working on both switches, but not other VLAN didnt? put in mind that router config was not touched at all, was same before and after restart.

I did again VTP changes from beginning of this reply, and 2nd VLAN started working on one switch (means both VLANS are working), but not on other switch. I noticed that traceroute did correct on switch where both VLAN's working correctly, but on other switch it was still pointing 1st hop to router, enen though default gateway was set to master switch. 

I restarted 2nd switch and both VLAN's started working correctly.

Take in consideration that master switch and switch1 were not restarted, only 2nd switch which started working correctly after that.

Any idea what was the problem? because few weeks ago, when I faced this problem, I first restarted switches (all of them) to be sure that restart is not the problem, master switch was started first, then after 2-3 mins i started other 2 switches.

Then, this morning, totally unplanned,