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Beginner

Cisco 3750 intrervlan routing not working

Hello,

I've defined 3 vlans on my 3750 switch. I've also enabled the routing on it. It is a standalone switch.

But the routing is not working between the vlans.

I don't know what to do .

I've attached the running-config

 

5 REPLIES 5
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Beginner

What faulting have you done to identify this issue?

Highlighted
VIP Mentor

Hello

Your configuration looks like it should work -

First of all you don't need the ip helpers or portfast on the SVI's as the switch itself is providing dhcp for vlans 2-3 but not 4 and these a virtual interfaces not physical

Do your hosts receive an ip address from dhcp or from a statically configured host can they ping there own default gateway ( ie the switch SVI ip address)?

Can you ping the hosts from the switch?

Sh ip arp
sh sdm prefer


res
Paul



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
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Collaborator

To add to Paul's post, spanning-tree portfast should be configured on the L2 interfaces so that hosts can more easily acquire a DHCP address.

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Beginner

hi 

first of all if you config switch to run PVST+ 

you assume that you config e.g previous ver of STP wich have all features backbonefast,portfast and....

second

portfast is layer 2 features of STP protocol

please note:

in your switch add command

spanning-tree mode pvst+

or maybe it works as pvst+

no problem

please delete portfast from your all line that you add before

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

pay attention that

if you want to use switch layer 3 as routing in 1 interface like that

use command no switchport

to bring out from layer 2 and work on layer 3 properly.....

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so are you set your client to use SVI(that config in your 3750) as gateway?

say exact problem?

why you mean don't work properly?

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and can your client take an ip address from your 3750?

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

please do sho ip int brie

to check all port are ON 

and running

check

connectivity between your 3750 and next device(e.g end-user or other sw L2)

what kind of config you did?

connect 3750 to sw L2 ? use trunk ? or trunk allowed vlan.... or access to specifiv vlan?

or check it to end-user use access ?

Highlighted
Enthusiast

Troubleshooting steps to follow

Check if all vlan status are up /up.

Check user on each vlan have correct default gateway of respective vlan.

Check user are able to ping their default-gateway.

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