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Cisco Bug: CSCvt19873 - ASR1k:Router stops forwarding traffic with MPLS TE & FRR

Last Modified

Sep 10, 2020

Products (14)

  • Cisco ASR 1000 Series Aggregation Services Routers
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4221 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ISR 1000 Series IOS XE SD-WAN
  • Cisco ISR 4000 Series IOS XE SD-WAN
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Known Affected Releases


Description (partial)

An interface stops forwarding traffic after shutting down [another] port-channel configured.
The issue may be triggered by last phy interface down event in the port-channel or first phy interface up event in the port-channel.

Router A---------------------(Po10)Router B(Int2)--------------------Router C(Gateway)
When we shut the physical member of Po10 on Router A the Int2 stops forwarding any traffic (except LACPDUs if it's configured as part of port-channel). All the packets need to go out from Int2 are dropped on Router B. 

The Int2 is P-to-P link with no relation with Po10 and it stops forwarding the traffic.
Router B needs to have MPLS TE and FRR configurations (or MPSL TE backup tunnel).

Having port-channel configured with MPLS TE ad FRR (or MPLE TE tunnel backup)
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