User's Manual

Table Of Contents
Understanding Networks
Network Management 10-5
VLAN ID
Enabling the VLAN ID
Chassis Management Controllers (CMCs) and Integrated Dell Remote Access Controllers (iDRACs) both
support VLAN tagging; however, they share a port with the I/O aggregator switch, which does not support
VLAN tagging. For this reason, before enabling VLAN tagging for the CMC and iDRAC, you must take
certain steps to make sure that all traffic (tagged and untagged) passes through the network and the
out-of-band switch port to the CMC without being dropped.
Caution To avoid losing device connectivity, it is critical to use extreme caution when enabling VLAN
tagging. If tagging is not enabled correctly on the switch port, then traffic from the CMC and
iDRAC is likely to be lost. Additionally, because the I/O aggregator does not support VLAN
tagging, you must also configure the switch port to allow untagged traffic. To ensure Active
System Manager can communicate between all tagged and untagged devices, your external
network must route between these tagged and untagged VLANs.
To prevent dropped traffic, configure your network as follows:
Use VLANs to carry both tagged and untagged traffic.
Configure routing for the affected subnets and VLANs.
Configure IP addresses so that, when a CMC or iDRAC moves to a private VLAN, its IP address also
moves to a different subnet than untagged traffic.
Note Failing to move the IP address will cause the router to assume the CMC or iDRAC is on the same network as
untagged packets. Routing will not work, and packets won’t forward correctly between subnets and VLANs
This can cause communication loss with some or all devices.
The following table shows a sample IP configuration that prompts the router to forward packets after the
VLAN is configured. Notice that the initial IP addresses of the CMC, iDRAC, I/O aggregator, and Active
System Manager virtual appliance are all on the same subnet, and (because VLANs are not used) all traffic
is untagged. The final IP addresses of the CMC and iDRAC do use VLAN tagging, and are on a different
subnet than untagged traffic.
Table 10-1 IP Configuration For Forwarding Packets
Initial IP Address / Subnet Mask /
VLAN Final IP Address / Subnet Mask / VLAN
CMC 172.6.53.4 / 255.255.0.0 / None 172.5.53.4 / 255.255.0.0 / 5
I/O Module 172.6.53.4 / 255.255.0.0 / None 172.6.53.4 / 255.255.0.0 / None
Active System Manager 172.6.53.4 / 255.255.0.0 / None 172.6.53.4 / 255.255.0.0 / None
iDRAC 172.6.53.4 / 255.255.0.0 / None 172.7.53.4 / 255.255.0.0 / 7
Adding or Editing a Network
Adding the details of an existing network enables Active System Manager to automatically configure resources that are
connected to the network.
1. On the Active System Manager navigation bar menu, click the Setup perspective.