TP-Link T3700G-28TQ T3700G-28TQ V1 UG - Page 46
Stack Introduction, Master, Slave, Merge, Split, Stack Split
View all TP-Link T3700G-28TQ manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 46 highlights
Stack Introduction 1. Stack Elements 1) Stack Role Each device in the stack system is called stack member. Each stack member processes services packets and plays a role which is either master or slave in the stack system. The differences between master and slave are described as below: Master: Indicates the device is responsible for managing the entire stack system. Slave: Indicates the device provides backup for the master. If the master fails, the stack will elect a new master from the remaining slaves to succeed the previous master. 2) Stack Event Stack event indicates the global events which might happen during stack operation process, with two options: Merge: It occurs when two independent stacks merge into one stack because of stack link establishment, as shown in the following figure: Figure 5-4 Stack Merge When stack merge occurs, the previous masters compete to be the new master. The stack members of the defeated stack will join the winner stack as a slave to form a new stack. Master will assign Unit Number to the newly joined members and compare their configuration files. The members with different configurations files with the master will download the configuration files of the master and re-configure. Split: It occurs when stack splits into two or more stacks because of stack link failures, as shown in the following figure: Figure 5-5 Stack Split After stack partition occurs, each newly established stack elects their own new master and use the MAC address of the master as its stack MAC address. However, stack partition probably brings about routing and forwarding problems on the network since the partitioned stacks keep operating with the previous IP address by default, which results in same IP address being reused in the same LAN. 2. Operation Procedure Stack management involves these four stages: Connecting the stack members, Topology collection, Master election, and Stack management and maintenance. 35