User guide

Chapter 7. Configuring the Cisco 3012 InfiniBand to Ethernet gateway 127
• Delayed proxy ARP transaction: By default, the delayed proxy ARP transaction
feature is always active. This feature is an extension of the self-cancelling ARP
request and comes into play when a duplicate ARP request is delayed.
– Setting Loop Protection to one allows for ARP packet painting, an extra loop protection
mechanism.
Though the loop protection mechanisms described above are very effective on most
LANs, it is possible for a duplicated ARP request to be received on the other side of the
bridge before the original has arrived. In this event, the duplicated packet is considered
to be the original, and the original packet is dropped.
To prevent this rare occurrence, the Ethernet gateway provides the option of inserting
a signature at the end of every proxy ARP request. This signature allows the Ethernet
gateway to filter the duplicate requests, and break the loop. This feature is enabled by
default and can be disabled if your Ethernet switch does not support it
– We do not configure an IP address for this bridge group for our example.
– We leave the multicast settings default.
Figure 7-7 shows the settings selected on the Groups tab of the Add Bridge Group dialog
box.
Figure 7-7 Groups tab settings for BG1