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Cisco Bug: CSCtf25646 - cat4k in MST mode does not send BPDU's unless access vlan1 or trunk .

Last Modified

Feb 05, 2017

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)

Cat4k stops sending BPDU's unless port is configured in access vlan 1 or configured for trunk .
seen on 12.2(46)SG for SUP4/5 and 12.2(46)SG for SUP6, Issue not seen with 12.2(40)SG on SUP4/5.

STP loop is triggered if switchport access ports are configured with access vlan other than vlan 1.
Not seen if mode trunk configured.
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