IBM VLAN Question on Trango GigaPlus

April 17, 2012 14:52

Originally from ticket #6474.

Hello,
We have a question on the Trango GigaPlus radio running version 1.3.2. Right now, we have inband management set to tag traffic on a separate VLAN than the data traffic. Our switch port is set up as a trunk port allowing both VLANs through. After implementing it this way, our customer noticed that they are seeing VLAN drop messages on their router interface on the other side of this link. In order to clear this up, we would like to convert this radio to have inband management with both the data and management on one VLAN instead of two (and subsequently just convert the switch port on our side to just an access port). If we were to set the IBM Vlan ID to 1 on the Trango radios on both sides, would this work (since it should theoretically add the VLAN tag we want back in at the switch port)?

Thanks.

Shannon Flynn
Manager - Network Operations Center, CCNA, ATSP/UCAS

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1 comment

Scott Chester April 17, 2012 14:54
With the 3.0 release for GigaPlus we've introduced the ability to run IBM without a VLAN tag. You wouldn't set the VLAN to 1, you would simply turn vlan tagging off with the command <ibm tagging off> or via the web interface. You'll still see a VLAN identified, but it is not used.
```
(.56-config)# ibm 
IBM Enable: on 
IBM Tagging: on 
IBM Vlan ID: 100 
IBM IP Address: 172.16.1.56 
IBM Netmask: 255.255.255.0 
(.56-config)# ibm tagging off 
IBM tagging: off

SUCCESS 
(.56-config)# ibm 
IBM Enable: on 
IBM Tagging: off 
IBM Vlan ID: 100 
IBM IP Address: 172.16.1.56 
IBM Netmask: 255.255.255.0 
```
The IBM and OBM addresses should still be in separate IP subnets to ensure proper routing of traffic on the desired interface.

Alternatively, you could technically put your traffic on the same tagged VLAN as the customer's, but they would have to set their interface to be a trunk port as well.

Note: our best practice is still to run a dedicated management VLAN with the highest CoS/QoS settings to ensure management traffic is prioritized over other data types. Without a separate management VLAN it is possible for traffic storms to cause loss of management access (i.e. if you can't get into the radio because the network is too saturated with other traffic). Note in some cases with IBM enabled and running on the same VLANs as traffic, broadcast and multicast traffic may be limited to 100 Mbps because this traffic will be forwarded to the internal IBM port.
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