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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


Description (partial)

 Cisco Nexus 5k/7k NXOS vlan range is as follows:
 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.
 The problem happens only when Cisco Nexus switch is connected to Cisco Catalyst 
 switch running MST and which has different range of reserved vlans 
 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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