Unable to Telnet

glsagredo · ‎10-25-2004

I have a Management vlan (100).

All switches are in that Vlan.

I can not telnet into one of the switches though. I can telnet into all switches from the "cmd" prompt, except for one.

My computer is on a different subnet then the switches.

This is my network path (My Computer)-->Switch(cant telnet to)

Another network path to another switch on the LAN that works is

(My Computer)-->Switch(Cant telnet to)-->MaintSwitch

So what could be my problem?

Thanks for Reading.

mrembetsy · ‎10-25-2004

could be any number of things;

did you do a no shut on the vlan100 int, is the default vlan1 shut?

do you have a gateway on the switch for your vlan100? can you ping your gateway from console on the switch. Can you ping the switch from your computer?

what is doing your routing?

sorry so many things it could be, Also what type of switch is it you are trying to telnet to

mike

a.awan · ‎10-25-2004

Like Mike said it could be a multitude of things but my first guess would be that the switch you are unable to telnet to does not have a default gateway configured.

glsagredo · ‎10-25-2004

Vlan 100 is active.

Vlan 1 is shutdown.

its a 4507

Yes I have a default gateway.

I can ping all other switches except for the 4507.

Routing being done by a 3550 L3 switch

spremkumar · ‎10-25-2004

hi

i would suggest to go by step by step troubleshooting procedure to isolate the exact point which stucks up the communication.

just try to find out whether ur able to reach ur wkstation from the L3 switch and also the (4507)switch from ur L3 switch.

tht shuld help u out to solve ur problem.

regds

Kevin Dorrell · ‎10-25-2004

Is there a trunk between the 4507 and the rest of the network? Maybe that link is not trunking, possibly because of the config on the 4507?

Kevin Dorrell

Luxembourg

Richard Burts · ‎10-26-2004

If you can not ping the switch, then there is some IP connectivity problem and that is what is preventing you from telnetting to the switch.

Can the 4507 ping its configured gateway?

can the 4507 ping anything beyond its gateway?

It might be very helpful to post the relevant parts of the config of the 4507.

HTH

Rick

HTH

Rick

mrembetsy · ‎10-26-2004

indeed there is some ip connectivity problem. Please post your config and we can help further.

mike

glsagredo · ‎10-26-2004

Okay Ill try and answer these as best as possible

Kevin - I have trunks running between all switches Yes. I can telnet into the 3550 (Core) then telnet into the 4507 from there. If I try to telnet to 4507 Then I have the problem.

Would the port my computer is plugged into on the 4507 have to be "switchport native vlan" to the management vlan?

Rick - I cannot ping the switch from my computer (not sure about from the 3550 ill test after lunch)

Mike - ill post the config after lunch :)

Richard Burts · ‎10-26-2004

It is good to know that you can telnet into the 4507 from the 3550. I think it makes it more likely that the issue is something about the definition of the default gateway on the 4507. It would be especially helpful if you would post the config.

When you do telnet to the 4507 from the 3550 can you ping from the 4507 to other addresses on the 3550 or addresses beyond the 3550? Can you ping from the 4507 to the address of your PC?

HTH

Rick

HTH

Rick

glsagredo · ‎10-27-2004

Heres a basic run down of my config

And about pings I have ICMP blocked. Before when I allowed it I couldn't ping the 4507, but I could ping all other switches on the network from my computer. And im pretty sure I could ping the 4507 from the 3550 (cant remember so dunno)

but heres the config, pieces of it anyways.

----------------------------------------------

version 12.1

no service pad

service timestamps debug datetime localtime

service timestamps log datetime localtime

boot system flash bootflash:

logging buffered 50000 debugging

clock timezone cst -6

clock summer-time cst recurring

ip subnet-zero

no ip source-route

no ip domain-lookup

spanning-tree extend system-id

redundancy

mode rpr

main-cpu

auto-sync standard

interface GigabitEthernet1/1

interface GigabitEthernet1/2

interface GigabitEthernet2/1

interface GigabitEthernet2/2

interface GigabitEthernet3/1