Weird Problem- Interface VLAN can not be pinged

[mhdganji110]

Hi !

There is some very strange Problem which is driving me crazy

recently i bought a dozen of access switches most of them are 2960

when i updated the ios with 12.2(55) SE1 i encountered an error about licensing issues.

It said :

Error Message ILET-1-AUTHENTICATION_FAIL: This

Switch may not

have been

manufactured by Cisco

or with

Cisco's

authorization. This product may contain

...

I objected the seller that these are fake ones but he rejected and sent me the 12.2(58) SE2 ios

and with that ios the message above disappeared.

first of all i like to know your opinion about that

and second problem which is making me crazy

the switch interface vlan can not be pinged from not-direct connected devices.

Assume a very simple scenario

PC1----Sw1-----Sw2-----PC2

all in vlan 1 all up and all in one subnet

PC1 can ping int vlan 1 (on switch 1) and also PC2 but can not ping int vlan 1 ip address on sw2

PC2 can ping sw2 int vlan 1 ip and also pc1 but not sw1

and the switches can not ping int vlan 1 ip address of each other

i configured tens of switches but this is the first time i encounter with this

any thing missing or any strange point in that ?

[mhdganji110]

The Problem Still Exists

Nobody Can Help Me Please ?

[cadet alain]

Hi,

I've just tried it and it is working without any problem.

did you wait for STP to converge ? ---> all links green

Regards.

Alain

[ahmet7322]

ip default-gateway <ip> solved my problem in my case. My topology was like:

                                         RT (subints for vlan5,vlan10,vlan99)

                                           || (trunk)

TFTP               =                SW             =                       PC

(vlan99)          (access)                      (access)           (vlan10)

int vlan 5 ip address on switch is 192.168.5.99

I wasn't pinging to SW from TFTP Server. I issued ip default-gw 192.168.5.1 and perfectly done.

[ebarticel]

I know you don't need it, but maybe have ip default-gateway configured on both switches ponting to each other.

Hope this helps

Eugen

[mhdganji110]

Dear Friends

Thanks for your response but

There is not any STP issues

There is not any redundant link here

As you see in attached Packet Tracer File, This Scenario Should Work Very Easily But There is Something Wrong With My Switches I Think

And Also I Tried Default Gateway But I'm Sure It is Not Needed ! All On Same VLAN And Same Subnet and ...

So Setting Default Gateway Is Not Needed (As You See in PT File)

I Tried Manipulating ip route-cache and Faced Some Different Behaviors

Can it Be Related ?

[ebarticel]

Maybe try clear out the ip routes and arp cache, shutdown and open ports connecting switches, no shutdown on vlan interfaces?

Do you have default getway configured on PCs?

Eugen

[mhdganji110]

Int vlans are "no shut"

as i said pc1 can ping int vl 1 on switch 1 so certainly it is not shut

default gateway is set on pcs but as i said i think it is not necessary

caches are cleared cause i reloaded them

[ebarticel]

Did you try without gateways configured on pcs?

[mhdganji110]

Certainly Yes !

First i tried it without setting dg because as i said i think it is unnecessary

but after that i tested all sorts of things to do the job but ...

just llok at the pkt file attached

i like to do the same simple scenario. as u see no dg is set on any devices and all is ok

i have done this on many switches before.

maybe my devices are fake !

[ebarticel]

Thats strange indeed.

I don't know what else to suggest unless you send me one of those "fake" switches to test.

Did you try creating different vlan than default and add those ports to it, maybe it doesn't like vlan 1.

Good luck

Eugen

[shanemoss]

Is the link between the switches configured as an access or trunk link? If trunk, do you have VTP pruning enabled? If so disable it. What does your CAM table look like on each swicth "show mac address-table" - does it have a correct MAC address for the next switch?

[mhdganji110]

as seen in PT file they are all access links

in PT and all my previous switches it worked but now on these switches it does not !!

does ip route cache concerns here ?

i cleared no ip route cache on int vlan 1 of one switch and now i cant even ping it from a directly attached PC !

[mhdganji110]

tried this before

i used vlan 3 instead vlan 1 and still there was no success

[randy.becker]

What switches are you using?  I know with XL version (hardware) it will not allow Vlan 1 to work.  Is this the lab found in Discovery 3 semester, chapter 3 by any chance?  Little more info please.  Finally, have done other vlans on these switches?  sh vlan on both switches and make sure all ports are within the same vlan.  If not, erase start,  delete flash:vlan.dat and reload  Maybe your ports are found in another vlan.  Most instructors forget to delete the old vlan.dat.  Hopefully this is your issue.