Description

This article explains how to identify and resolve node addition issues in Junos space Fabric due to bandwidth issue between nodes. The node addition fails with the below error: 
Add Node Results: Node name: Nodename Node IP: NodeIP Config Node status: Success Config NMA status: Fail

This issue occurs when the secondary node is in a different location, and they are connected via an L2 link.

Symptoms

To identify the issue, use the Iperf tool. By default, Iperf is not installed in Junos space. It must be installed manually with help from the rpm file. The rpm file can be downloaded using the below link:

RPM For IPERF tool

Once, it is downloaded, upload it to Junos space using any preferable method (like WinSCP) to the directory /home/admin.
Refer: How to configure WinSCP to connect to Junos Space

After uploading the file, install it on both Junos space nodes using the below command: 
# rpm -i iperf-2.0.13-1.el7.x86_64.rpm
Open the port number TCP 5001 on the secondary node using the below command (By default, It will be blocked by the Iptables): 
# iptables -A INPUT -p tcp --dport 5001 -j ACCEPT
Treat the secondary node as Iperf "server" and the primary node as Iperf "client"

On server:  
# iperf -s

On client: 
# iperf -c <server_IP>  // server_IP will be Secondary Server eth0 IP.

Sample output:

# iperf -c <secondary node IP>

------------------------------------------------------------

Client connecting to X.X.X.X, TCP port 5001

TCP window size: 85.3 KByte (default)

------------------------------------------------------------

[ 3] local Y.Y.Y.Y port 58708 connected with X.X.X.X port 5001

[ ID] Interval      Transfer    Bandwidth

[ 3] 0.0-10.1 sec  150 KBytes  122 Kbits/sec


As per the above output, the bandwidth from the primary to the secondary node is 122Kbps, it should be minimum 100Mbps.

Note: Sometimes, the bandwidth from Secondary to Primary and from primary to secondary will be different due to the MTU issue.

Solution

The bandwidth between the Primary and Secondary nodes should be 100mbps or 1gbps.
Refer to the HA guide: Inter-Node Communication Among Nodes in a Junos Space Cluster

To add the node in Fabric, refer to: Adding a Node to an Existing Junos Space Fabric

To resolve the issue, contact the Service provider team who provided the L2 link connection.
Once the bandwidth issue is resolved by the Service provider, we can add the node to the Fabric.

Modification History

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