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Cisco Bug: CSCtc54335 - NXOS range creates MST region boundaries

Last Modified

Mar 05, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

4.2(1)

Description (partial)

 Symptom:
 
 Cisco Nexus 5k/7k NXOS vlan range is as follows:
 1-3967,4048-4093
 
 So the following vlans are reserved:
 3968 to 4047 and 4094 
 
 This differs from the Cisco Catalyst switch reserved vlans:
 0, 4095, 1002-1005 reserved by the cat6k
 
 Best practice is to create mapping for all used and non-used vlans from the
 very beginning. Because of this change of vlan mapping between the two set of
 switches, it causes MST regions to be separated and as a result it creates a
 region boundary.
 
 Conditions:
 
 The problem happens only when Cisco Nexus switch is connected to Cisco Catalyst 
 switch running MST and which has different range of reserved vlans 
  
 Workaround(s):
 
 In the MST region, please specify the range of vlans which does not contain a
 vlan which is in the reserved list of any of the switches.
  
  
  
 
 

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