Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
The solution is to set both ports in the VLAN to Tagged (detailed in the following procedure). Setting
both ports in the VLAN to Tagged stops the stripping of the 4 bytes from the data packet and prevents
the NIC card in the network access device from recognizing the packet as a runt and dropping it. Network
devices with 802.1Q-compliant NIC cards will accept the tagged packets. Network devices with
non-802.1Q compliant NIC cards will still drop these tagged packets. The solution may require
upgrading network devices with non-802.1Q compliant NIC cards to 802.1Q-compliant NIC cards. You
can also set both ports in the VLAN to Untag, but you will lose 802.1Q compliance.
Procedure: Change VLAN Port Tag and Untagged Settings
Step 1 Display the CTC card view for the Ethernet card involved in the problem VLAN.
Step 2 Click the Provisioning > VLAN tabs (Figure 2-14).
Figure 2-14 Configuring VLAN membership for individual Ethernet ports
Step 3 If the port is set to Tagged, continue to look at other cards and their ports in the VLAN until you find
the port that is set to Untag.
Step 4 At the VLAN port set to Untag, click the port and choose Tagged.
Note The attached external devices must recognize IEEE 802.1Q VLANs.
Step 5 After each port is in the appropriate VLAN, click Apply.