I'm going to suspect you have a split brain scenario. Because you only have two switches in the VC, the backup assumes it's lost connection to the stack and won't promote itself to master. The recommended solution is to configure a VC-peer keepalive link (aka dual-chassis heartbeat).
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This is an out-of-band Layer 3 interface (not one of the regular VC ports) that provides a tie-breaker between the two members.
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If the backup loses the master on the VC ports but still sees it reachable on the keepalive link, it knows there's a split and stays down.
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If the backup loses both the VC ports and the keepalive link, it assumes the master is gone and promotes itself to master.
Choose one port for each switch and put them in their own dedicated VLAN. Configure the interfaces as VC-peer keepalive interfaces. The command goes something like this (I'm not 100% sure and not in a position to verify):
set virtual-chassis no-split-detection interface <if>
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MARK JOHNSON
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Original Message:
Sent: 09-28-2025 14:56
From: MUHAMMAD SAAD
Subject: EX2300-24P | Stack Issue
Still stuck on the same issue. Can some one advise?
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MUHAMMAD SAAD
Original Message:
Sent: 09-27-2025 10:05
From: MUHAMMAD SAAD
Subject: EX2300-24P | Stack Issue
Hi,
Anyone can help out on this?
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MUHAMMAD SAAD
Original Message:
Sent: 09-27-2025 06:54
From: MUHAMMAD SAAD
Subject: EX2300-24P | Stack Issue
Hello,
We are facing a problem and the assistance is required. We have configured 2 Juniper EX2300-24P switches in stack but its not working. When we have powered of one of the switch (Master) then all ports of other switch (backup) got down and remains down until the Master switch got powered ON. Both the switches have the same firmware version.
The outputs are attached for reference. Can some one help out on this, what's missing.
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MUHAMMAD SAAD
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