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New Member

4948 - layer 2 issue?

Hi, I have 2 interfaces on a 4948 which are in VLAN 68, both connected to hosts. both interfaces are switchports, access vlan 68.

The hosts can't ping eachother through the switch.

Is there a restriction where you have to have a layer 3 int on the box that is working in order for it to pass layer2 traffic?

I'm not sure if this is a bug.

Our config looks good:

interface GigabitEthernet1/10

switchport access vlan 68

switchport mode access

interface GigabitEthernet1/29

switchport access vlan 68

switchport mode access

speed 1000

duplex full

interface Vlan68

no ip address


If I take the switch out of the picture, the hosts communicate. The switch cabling is good and both ports are up.

have any of you seen this?

New Member

Re: 4948 - layer 2 issue?

The VLAN being shutdown is more than likely the issue, can you do a "no shut" on it?

New Member

Re: 4948 - layer 2 issue?

didn't help...

New Member

Re: 4948 - layer 2 issue?

Can the hosts ping their gateway? also if you do a "show ip interface brief" on the 4948 what is the status of the VLAN?

New Member

Re: 4948 - layer 2 issue?

One of the devices is the gateway.

They can ping eachother only if the 4948 is out of the picture.

Show ip int brief does show it up...

Interface IP-Address OK? Method Status Protocol

Vlan68 YES manual up up


Re: 4948 - layer 2 issue?

What's the output of "sh vlan"? If you change the vlan of all the ports concerned to 1 (for testing only) can the systems talk?

Hall of Fame Super Bronze

Re: 4948 - layer 2 issue?

1) Go auto/auto on the end-hosts and the switchports. I see you hardcoded the speed/duplex on 1/29 - change it to auto.

2) Post the output from typing show mac-address-table

3) Assign an IP on SVI 68 that belongs on the same subnet as the end-hosts. Can you ping the end-hosts from the switch ?

4) Post the arp table from the end-hosts.



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