High Availability Traffic/Heartbeats are not seen on NetScaler Tagged Channel Network Interfaces

If you are optimizing traffic on a multi tenant server network with numerous VLANs, while isolating management traffic you might encounter a problem where heartbeat packets are not visible on all interfaces.

This is common on NetScaler high availability pairs using Link Aggregation on ether-channel switch ports (in this example Cisco Switches). The following demonstrates this issue:

> show node1) Node ID: 0IP: 10.187.125.21 (ns01)Node State: UPMaster State: PrimaryFail-Safe Mode: OFFINC State: DISABLEDSync State: ENABLEDPropagation: ENABLEDEnabled Interfaces : 0/1 LA/1Disabled Interfaces : 1/8 1/7 1/6 1/4 1/3 1/2 0/2HA MON ON Interfaces : 1/8 1/7 1/6 1/4 1/3 1/2 0/1 0/2 LA/1Interfaces on which heartbeats are not seen : LA/1Interfaces causing Partial Failure: NoneSSL Card Status: UPHello Interval: 200 msecsDead Interval: 3 secsNode in this Master State for: 0:21:42:50 (days:hrs:min:sec)2) Node ID: 1IP: 10.187.125.22Node State: UPMaster State: SecondaryFail-Safe Mode: OFFINC State: DISABLEDSync State: SUCCESSPropagation: ENABLEDEnabled Interfaces : 0/1 LA/1Disabled Interfaces : 1/8 1/7 1/6 1/4 1/3 1/2 0/2HA MON ON Interfaces : 1/8 1/7 1/6 1/4 1/3 1/2 0/1 0/2 LA/1Interfaces on which heartbeats are not seen : LA/1Interfaces causing Partial Failure: NoneSSL Card Status: UPLocal node information:Critical Interfaces: 0/1 LA/1Done

In most situations the heartbeat packets will stop by vLAN tagging mismatch on the switch. Review the following article for additional information: CTX109843 – How to Configure a NetScaler Appliance Using Link Aggregation to Connect Pairs of Interfaces to the Cisco Switches​

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