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Cisco Bug: CSCuo02910 - Large VTP Updates Fail on 3750-X

Last Modified

Feb 14, 2018

Products (180)

  • Cisco Catalyst 3750-X Series Switches
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 2960-24TC-L Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Catalyst 2960G-24TC-L Switch
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Known Affected Releases

15.0(2)SE5 15.2(1)E

Description (partial)

3750X switches running as a VTP Client will fail to update their VLAN database when changes are made on the VTP Server. Updates may never happen or take a very long time (several hours) to complete

This behavior is observed when the VLAN database transmitted over VTP is fairly large, with each VLAN having a unique name. Smaller VLAN databases, or VLANs with shorter names are less likely to trigger this issue.

This will be observed when the link speed the 3750-X is receiving the updates on is a Gigabit or faster. Slower speeds, like 10 megabit, will not trigger this issue.
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