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Beginner

Trying to configure layer 3 switching

I've attatched the packet tracer file to see if anyone can figure out why
I can't communicate across vlans.  Pretty sure its a simple fix for you wizards out there.

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3 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Guru

Re: Trying to configure layer 3 switching

Kevin

Any chance you could post as a doc or something because not all of use packet tracer.

Things to check -

1) from a client in vlan 10 (for example) can you ping the vlan 10 SVI address

2) from a client in vlan 10 can you ping another SVI ip address on the switch

3) do you have the correct default-gateways set for the client

4) any access-lists configured

Jon

View solution in original post

Enthusiast

Re: Trying to configure layer 3 switching

Check default gateway on the client and subnet mask

Can you ping yourself (on both the router and the pc)

Is the pc in the right vlan?

sho mac-address

sho ip arp

Both are your friends

View solution in original post

Advisor

Re: Trying to configure layer 3 switching

Hi,

In each VLAN the gateway was unaccessible so there was surely a problem on the link between the 3560 and the 2960.

Logging into 3560, the VLAN interfaces were up/down.

Resolution: on the 3560 change the f0/1 back to a L2 port with the command switchport --->the nterfaces go up/up

Then a native vlan mismatch message appears on the 3560: vlan 1 on this side and vlan 99 on the other side

Resolution: on f0/1 put these commands

-switchport trunk encapsulation dot1q

-switchport mode trunk

-switchport trunk native vlan 99

Regards.

Alain.

Don't forget to rate helpful posts.

View solution in original post

4 REPLIES 4
Hall of Fame Guru

Re: Trying to configure layer 3 switching

Kevin

Any chance you could post as a doc or something because not all of use packet tracer.

Things to check -

1) from a client in vlan 10 (for example) can you ping the vlan 10 SVI address

2) from a client in vlan 10 can you ping another SVI ip address on the switch

3) do you have the correct default-gateways set for the client

4) any access-lists configured

Jon

View solution in original post

Enthusiast

Re: Trying to configure layer 3 switching

Check default gateway on the client and subnet mask

Can you ping yourself (on both the router and the pc)

Is the pc in the right vlan?

sho mac-address

sho ip arp

Both are your friends

View solution in original post

Advisor

Re: Trying to configure layer 3 switching

Hi,

In each VLAN the gateway was unaccessible so there was surely a problem on the link between the 3560 and the 2960.

Logging into 3560, the VLAN interfaces were up/down.

Resolution: on the 3560 change the f0/1 back to a L2 port with the command switchport --->the nterfaces go up/up

Then a native vlan mismatch message appears on the 3560: vlan 1 on this side and vlan 99 on the other side

Resolution: on f0/1 put these commands

-switchport trunk encapsulation dot1q

-switchport mode trunk

-switchport trunk native vlan 99

Regards.

Alain.

Don't forget to rate helpful posts.

View solution in original post

Beginner

Re: Trying to configure layer 3 switching

Thanks guys all of your suggestions helped.  Problem solved. 

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