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Cisco Bug: CSCvr93847 - Ingress BUM traffic dropped due to incorrect rpf vector programming for overlay port-channel

Last Modified

Jan 22, 2020

Products (12)

  • Cisco Nexus 6000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5624Q Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 5696Q Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 56128P Switch
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Known Affected Releases

7.3(6)N1(1)

Description (partial)

Symptom:
N5672 LEAF connected to SPINE with port-channel as the overlay port, the BUM traffic ingress through this port-channel are dropped on certain physical member ports. 

For example: PO1 connected to SPINE as overlay port, contains e2/1 and e2/2. All BUM traffic ingress through e2/1 are dropped, while ingress through e2/2 are are passed. 

For dropped traffic, IP_RESV_0  bit is set in ELAM result.

N5672-2(bigsur-elam)# sh capture lu
Ingress Interface: Ethernet2/1 IS PC

| IP_RESV_0          | 1                    |
 

N5672-2(bigsur-elam)# sh cap rs

| OUT_DISCARD         | 1                   |
| OUT_DROP            | 1                   |

Conditions:
1/ Use port-channel as the overlay port
2/ Physical member joins port-channel after port-channel is UP
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