200.1.1.1 disabled disabled 2−1000
show trunk
Cat2948G> (enable) show trunk
* − indicates vtp domain mismatch
Port Mode Encapsulation Status Native vlan
−−−−−−−− −−−−−−−−−−− −−−−−−−−−−−−− −−−−−−−−−−−− −−−−−−−−−−−
2/49 desirable dot1q trunking 1
Port Vlans allowed on trunk
−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
2/49 1−1005
Port Vlans allowed and active in management domain
−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
2/49 1−3,10
Port Vlans in spanning tree forwarding state and not pruned
−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
2/49 1−3,10
•
Troubleshoot
This section provides information you can use to troubleshoot your configuration.

Troubleshooting Procedure

Follow the instructions below to troubleshoot your configuration.
If you are not able to ping devices within the same VLAN, you should check the VLAN assignment
of the source and destination ports by issuing the show port mod/port command for CatOS and the
show interface status command for Cisco IOS® Software, to make sure they are in the same VLAN.
If they are not in the same switch, make sure that trunking is configured properly by issuing the show
trunk command for CatOS and the show interfaces trunk command for Cisco IOS Software, and
that the native VLAN is matching on either side. Make sure the subnet mask is matching between the
source and destination devices.
1.
If you are not able to ping devices in different VLANs, make sure you can ping the respective default
gateway (refer to step 1 above). Also, make sure the device's default gateway is pointing to the correct
VLAN interface IP address and that the subnet mask is matching.
2.
If you are able to reach the Internet, make sure the default route on the 3750 points to the correct IP
address, and that the subnet address matches the Internet gateway router by issuing the show ip
interface interface−id and show ip route commands. Make sure that the Internet gateway router has
routes to the Internet and the internal networks.
3.
Related Information
Creating Ethernet VLANs on Catalyst Switches• LAN Switching Technology Support• Catalyst LAN and ATM Switches Product Support• Technical Support − Cisco Systems•
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Cisco − Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration