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Cisco Bug: CSCur09885 - Route is not installed for L2 MEC port channel on standby Sup in VSS.

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)

Upon VSS-standby reload, the route entries corresponding the L2 Multichassis Ether Channel are not installed at VSS-standby. Partial packet drops are observed.

For IP packets passing through the L2 Multichassis Ether Channel, partial packet drops are noticed.

On a VSS, L2  Multichassis Ether Channel, must be configured with trunk mode. The issue is seen after the VSS-standby switch reloads and becomes part of the VSS again.

Related Community Discussions

Cisco 4500X IOS upgrade through ISSU
Hi, I am having 2 number of cisco 4500x switch and configured with VSS so one switch is active and another switch is standby. I am panning to upgrade IOS through ISSU i read in document that it required auto boot enable in switch. My switch current Configuration register = 0x2101 do i need to change config register or this will ok. If need to change then what will be auto boot and after IOS upgrade do i need to change it again. Please help....
Latest activity: Jun 12, 2018
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