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ledj

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7 years ago

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ledj

12 Posts

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2370

August 24th, 2019 00:00

How to replace a switch in a VLT setup?

I have two S4048-ON (called r12-core1 and r12-core2) with DNOS Firmware 9.10(0.0) in a VLT setup.

Some background info:

All traffic on r12-core1 has stopped, looking on the physical switch no blinking occurs, only shows non-blinking light on all connected ports.
The usual working ssh login fails to connect with a timeout (network is unreachable)

I think the r12-core1 switch might hit the clock signal bug described here:

<ADMIN NOTE: Broken link has been removed from this post by Dell> (btw. does anybody else experienced the clock signal bug?)

Which is a possible reason with this uptime (show system):
Up Time : 2 yr, 51 wk, 2 day, 19 hr, 4 min

On r12-core2 a "show vlt brief" outputs:
VLT Domain Brief
------------------
Domain ID: 1
Role: Primary
Role Priority: 8192
ICL Link Status: Down
HeartBeat Status: Down
VLT Peer Status: Down
Local Unit Id: 1
Version: 6(7)
Local System MAC address: 34:17:eb:fc:c1:c4
Remote System MAC address: 00:00:00:00:00:00
Configured System MAC address: 02:00:00:00:00:01
Remote system version: 6(7)
Delay-Restore timer: 90 seconds
Delay-Restore Abort Threshold: 60 seconds
Peer-Routing : Disabled
Peer-Routing-Timeout timer: 0 seconds
Multicast peer-routing timeout: 150 seconds

Options to get VLT back in shape:

1. Power cycle r12-core1 (the non-responsive switch) and hope it did not hit the clock signal bug.
1.1 Then update the firmware to the latest and hope a fix will avoid this situation again.

2. Replace r12-core1 with another working switch running the same firmware and configuration.

Now my question is how do I replace a switch in a VLT configuration correctly?

I have a replacement switch for r12-core1, and have loaded the same firmware version and restored the configuration from r12-core1 on it (so it's identical in firmware and configuration).

Can I just change over the network cables to the new r12-core1 and power on and VLT will get back into a working state with no disruption on traffic?