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Cisco Bug: CSCvj09305 - slow convergence when configuring ha-mode sso for IPv6 peers

Last Modified

May 26, 2019

Products (13)

  • Cisco IOS
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco 4431 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco 4451-X Integrated Services Router
  • Cisco Cloud Services Router 1000V
  • Cisco ASR 1000 Series Route Processor (RP2)
  • Cisco 4351 Integrated Services Router
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Known Affected Releases


Description (partial)

In scale setup of around 200 IPV6 BGP peers with total 500k prefixes, there's slow BGP convergence. Especially, when peers withdraw BGP routes, ASR1K cannot send out UPDATEs to peers quick enough and Out-Queues are built up. As a result, there will be BGP sessions flapped.

The issue is seen only when each BGP neighbor is configured with 'ha-mode sso'
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