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Cisco Bug: CSCvu65369 - Link auto-negotiation fails between C1111-4P ES-4 switch module and Meraki MX100

Last Modified

Oct 09, 2020

Products (1)

  • Cisco 1000 Series Integrated Services Routers

Known Affected Releases


Description (partial)

Directly connected link between ISR1k C1111-4P and Meraki MX100 will fail to come up intermittently.

With auto-negotiation enabled on the link the interface will sometimes stay in down/down state.
The problem may be seen after a few iterations of 'shut/no shut' sequence on the GigabitEthernet interface.

C1111-4P ES-4 Gi0/1/x --------  MX-100

After the port is stuck in 'down/down' state it is possible to recover it by flapping the port using 'shut/no shut' sequence.

Negotiation set to 'auto' on the link
Port is part of the ES-4 Switch Module on ISR1k
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