Netgear XSM4324FS User Manual - Page 167

M4300 Intelligent Edge Series Fully Managed Stackable Switches For NSF to be effective, adjacent networking devices must not reroute traffic around the restarting device. The switch uses three techniques to prevent traffic from being rerouted: • A protocol can distribute a part of its control plane to stack units so that the protocol can give the appearance that it is still functional during the restart. Spanning tree and port channels use this technique. • A protocol can enlist the cooperation of its neighbors through a technique known as graceful restart. OSPF uses graceful restart if it is enabled. • A protocol can restart after the failover if neighbors react slowly enough that they cannot normally detect the outage. The IP multicast routing protocols are a good example of this behavior. To take full advantage of nonstop forwarding, Layer 2 connections to neighbors must be through port channels that span two or more stack units, and Layer 3 routes must be ECMP routes with next hops through physical ports on two or more units. The hardware can quickly move traffic flows from port channel members or ECMP paths on a failed unit to a surviving unit. Configure a Stack You can move the primary management unit functionality from one unit to another. Upon execution, the entire stack (including all interfaces in the stack) is unconfigured and reconfigured with the configuration on the new primary management unit. After the reload is complete, all stack management capability must be performed on the new primary management unit. To preserve the current configuration across a stack move, save the current configuration to the NVRAM before performing the stack move. A stack move causes all routes and Layer 2 addresses to be lost. The administrator is prompted to confirm the management move. Select a New Stack Master To select a new stack master: 1. Launch a web browser. 2. In the address field of your web browser, enter the IP address of the switch. The login window opens. 3. Enter admin as the user name, enter your local device password, and click the Login button. The first time that you log in, no password is required. However, you then must specify a local device password to use each subsequent time that you log in. The System Information page displays. 4. Select System > Stacking > Basic > Stack Configuration. Manage Stacking 167 User Manual