Resilient Arp Configuration; Introduction To Resilient Arp; Configuring Resilient Arp - 3Com 5500-EI PWR Install Manual

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Resilient ARP Configuration

When configuring resilient ARP, go to these sections for information you are interested in:

Introduction to Resilient ARP

Configuring Resilient ARP

Resilient ARP Configuration Example
Introduction to Resilient ARP
In expandable resilient networking (XRN) network application, normally you need to connect
redundancy links between the fabric and other devices to support the resilient network. But if the
connections inside the fabric break off, the fabric splits. In this case, the redundancy link may connect
with two or more Layer 3 devices with the same configurations in the same network. Thus these devices
operate the same routing function. Adopting the Resilient ARP function can avoid this. Resilient ARP
can find whether there are the same Layer 3 devices in the network. If so, it keeps one device as the
Layer 3 device, and changes the other devices to be the Layer 2 devices.
The state machine of Resilient ARP has six states which are Initialize, LisentForL3Master, L3Master,
L3slave, L2Master, and L2slave. L3Master sends Resilient ARP packets periodically to notify other
fabrics that the local fabric is in the Layer 3 state.
Resilient ARP implements the system state switching by sending/receiving Resilient ARP packets
periodically, so as to determine a device to work as a Layer 3 device or a Layer 2 device.
Configuring Resilient ARP
Resilient ARP configuration includes:
Enable/disable the Resilient ARP function.
When Resilient ARP function is enabled, the system can deal with the devices according to the current
state. When the connections inside a fabric break off, Resilient ARP can send Resilient ARP packets
through the VLAN interface where the redundancy link resides, so as to determine a device to work as
a Layer 3 device or as a Layer 2 device.
Configure the VLAN interface through which Resilient packets are sent.
You can use the following commands to configure the VLAN interface through which Resilient packets
are sent. When no VLAN interface is specified, Resilient packets are sent through the default VLAN
interface.
Follow these steps to configure the Resilient ARP function:
To do...
Enter system view
Enable the Resilient ARP
function
Use the command...
system-view
resilient-arp enable
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Remarks
—
Required
Enabled by default.