In the latest maintenance release of Netscaler (10.1 to 0.13), we added support for the new "Link Redundancy". I'll give you an introduction, configuration steps of this feature in this blog.
Link Redundancy (RS) offers the possibility of a hot standby link (or channel). During normal operation, a link / channel is operational that handles all traffic. A second connection / channel will be designated as standby. When the link / primary channel down or administratively arrested, the sleep / channel link will become live and begin to handle traffic.
Link redundancy is different from the link aggregation. In trunking, all links that are part of the aggregation group are active simultaneously. In addition, all links in the aggregation group are connected to the same peer switch. If link redundancy, one primary link is active. Secondary link is idle and becomes active only when main fails. In addition, primary links and backup / channels are connected to different switches peers in LR.
Link redundancy could be used with a single peer device or with several peer devices. As shown in the diagram below, Netscaler is connected to S1 and S2. S1 is the link to the primary link and S2 is on standby. Netscaler will start using the S2 S1 link only when the link is down. This provides a reliable backup for Netscaler connectivity.
as part of the LR function, we introduced a parameter called LR Low Threshold. This setting ensures that when the available bandwidth of a channel drops below the minimum threshold limit set, the channel is closed administratively. With LR, the standby channel will take over the primary channel threshold once min kicks-in. For example, assume that each channel suppression switch Netscaler two links 1 Scene. minimum threshold is set to be 1.5Gbps. When a link on the main channel fails, the available bandwidth of the channel is only 1 gig which falls below the threshold value. Now this complete channel is stopped and administrative standby channel takes over.
How to configure a redundant link Netscaler?
- RS is available by default on the LACP group
- To set the minimum threshold for the channel, use the following command
# Set
We can use this function when there is a requirement for Netscaler to connect to multiple switches for redundancy while avoiding network loops. Using the min threshold setting, you can switch to another channel when the available bandwidth drops below certain level. LR function provides a more powerful tool Netscaler to meet the networking requirements.
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