4 Replies Latest reply: Apr 5, 2019 9:00 AM by Tmckay RSS

    Nexus 9K EIGRP Flapping issue with Interface VLAN's

    Tmckay

      I have 2 Nexus 9K and 2 Nexus 5K that are in two vPC domains. Here is the diagram. VPC.p.png

      I have enabled EIGRP on all 4 switches. They all have the same vlans and interface vlans configured. For the most part EIGRP is working properly but I see a couple of the interface vlans are flapping.

      nx9a# sh logg

      2019 Apr  4 07:09:11 nx9a %EIGRP-5-NBRCHANGE_DUAL:  eigrp-DC [29400] (saas-base) IP-EIGRP(0) 20: Neighbor 10.10.1.

      6 (Vlan11) is up: new adjacency

      2019 Apr  4 07:10:09 nx9a %EIGRP-5-NBRCHANGE_DUAL:  eigrp-DC [29400] (saas-base) IP-EIGRP(0) 20: Neighbor 10.8.171

      .17 (Vlan171) is down: retry limit exceeded

      2019 Apr  4 07:10:13 nx9a %EIGRP-5-NBRCHANGE_DUAL:  eigrp-DC [29400] (saas-base) IP-EIGRP(0) 20: Neighbor 10.8.171

      .17 (Vlan171) is up: new adjacency

      2019 Apr  4 07:10:30 nx9a %EIGRP-5-NBRCHANGE_DUAL:  eigrp-DC [29400] (saas-base) IP-EIGRP(0) 20: Neighbor 10.10.1.

      6 (Vlan11) is down: retry limit exceeded

      2019 Apr  4 07:10:30 nx9a %EIGRP-5-NBRCHANGE_DUAL:  eigrp-DC [29400] (saas-base) IP-EIGRP(0) 20: Neighbor 10.10.1.

       

      The same two vlans flap on this switch.

      sh ip eigrp ne

      17  10.8.151.15             Vlan151         14   4w0d      1    50    0   19223

      20  10.8.171.15             Vlan171         10   3w6d      1    50    0   19220

      4   10.8.171.17             Vlan171         10   00:00:50  1    5000  1   0

      8   10.8.180.15             Vlan180         13   4w0d      1    50    0   19233

      9   10.8.181.15             Vlan181         11   4w0d      1    50    0   19218

      18  10.8.184.15             Vlan184         12   4w0d      1    50    0   19227

      21  10.10.1.6               Vlan11          10   00:00:35  1    5000  1   0

      23  10.10.1.7               Vlan11          14   1d01h     3    50    0   2601

      1   10.10.1.15              Vlan11          11   4w0d      2    50    0   19222

       

      All of the vlans have the default configs and the same configs so I am not sure why these interfaces would flap when the others don't. Any idea's are appreciated.