User guide

Chapter 7. Configuring the Cisco 3012 InfiniBand to Ethernet gateway 129
Figure 7-9 Subnet tab on Add Bridge Group window
In the example in Figure 7-9, we define the Subnet for this bridge group. Some comments
on these settings:
– 172.16.225.0 is the subnet being used for this bridge group (based on us using a 24-bit
mask of 255.255.255.0.
– Because we are using 24-bit mask, this is the prefix length for this subnet.
– In our example, we only have a single IP subnet using this bridge group, and that
subnet is what we entered into the Subnet tab. There might be situations where there
are more than a single IP subnet on a single p_key/VLAN. This is not common, but it is
seen from time to time. If you do want to have more than a single IP subnet in this
situation, you can enter the information for that subnet in the Subnet tab. Up to eight
subnets are supported in a bridge group (but in most cases, there will only be a single
entry in this tab).
4. After you have completed the three tabs in the Add Bridge Group window, click Add at the
bottom of the window. The commands are executed on the 3012 to provision this bridge
group with the defined characteristics and the bridge group information as shown in
Figure 7-10.
Figure 7-10 Bridge group created
Tip: It is important not to confuse the entries in the Subnet tab with having
InfiniBand clients using different p_keys, VLANs and IP subnets. If you have
InfiniBand clients using different p_key’s, VLANs and IP subnets, you would
accommodate this by creating another bridge group for these clients.