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If a pair of VPC switches is configured and one switch is missing a VNI configuration the VLAN is not allowed on the VPC peer-link. 2020 Sep 16 20:07:32 CORE9K-2 %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 15 on Interface port-channel30 are being suspended. (Reason: Vlan is not allowed on Peer-link) "show vpc consistency-parameters global" is not useful for understanding the issue. In fact, it will report the suspended VLANs as being configured as allowed but suspended. CORE9K-1# show vpc consistency-parameters global Legend: Type 1 : vPC will be suspended in case of mismatch Name Type Local Value Peer Value ------------- ---- ---------------------- ----------------------- STP MST Simulate PVST 1 Enabled Enabled STP Port Type, Edge 1 Normal, Disabled, Normal, Disabled, BPDUFilter, Edge BPDUGuard Disabled Disabled STP MST Region Name 1 "" "" STP Disabled 1 None None STP Mode 1 Rapid-PVST Rapid-PVST STP Bridge Assurance 1 Enabled Enabled STP Loopguard 1 Disabled Disabled STP MST Region Instance to 1 VLAN Mapping STP MST Region Revision 1 0 0 Interface-vlan admin up 2 3-4,161 3-4,161 Interface-vlan routing 2 1,3-4,161 1,3-4,161 capability VTP password 2 VTP pruning status 2 Disabled Disabled VTP version 2 1 1 VTP mode 2 Transparent Transparent VTP domain 2 Nve1 Adm St, Src Adm St, 1 Up, Up, 10.163.0.101, Up, Up, 10.163.0.101, Sec IP, Host Reach, VMAC DP, FALSE, Disabled, DP, FALSE, Disabled, Adv, SA,mcast l2, mcast 0.0.0.0, 0.0.0.0, 0.0.0.0, 0.0.0.0, l3, IR BGP,MS Adm St, Reo Disabled, Down, Disabled, Down, 0.0.0.0 0.0.0.0 Xconnect Vlans 1 QoS (Cos) 2 ([0-7], [], [], [], ([0-7], [], [], [], [], []) [], []) Network QoS (MTU) 2 (1500, 1500, 1500, (1500, 1500, 1500, 1500, 1500, 1500) 1500, 1500, 1500) Network Qos (Pause: 2 (F, F, F, F, F, F) (F, F, F, F, F, F) T->Enabled, F->Disabled) Input Queuing (Bandwidth) 2 (0, 0, 0, 0, 0, 0) (0, 0, 0, 0, 0, 0) Input Queuing (Absolute 2 (F, F, F, F, F, F) (F, F, F, F, F, F) Priority: T->Enabled, F->Disabled) Output Queuing (Bandwidth 2 (0, 0, 0, 0, 0, 0) (0, 0, 0, 0, 0, 0) Remaining) Output Queuing (Absolute 2 (T, F, F, F, F, F) (T, F, F, F, F, F) Priority: T->Enabled, F->Disabled) Allowed VLANs - 1,3-4,13,15,18,161,375 1,3-4,13,15,18,161,375 Local suspended VLANs - 15,375 "show vpc consistency-parameters vni" must be used to understand the mismatch.
VLANs are disallowed on the VPC peer-link for the following conditions: VN-segment configured under the VLAN on only one switch in the VPC member vni configured under the NVE interface on only one switch in the VPC
Use the "show vpc consistency-parameters vni" command to check VNI values between peers: CORE9K-2# show vpc consistency-parameters vni Legend: Type 1 : vPC will be suspended in case of mismatch Name Type Local Value Peer Value ------------- ---- ---------------------- ----------------------- Nve1 Adm St, Src Adm St, 1 Up, Up, 10.163.0.101, Up, Up, 10.163.0.101, Sec IP, Host Reach, VMAC DP, FALSE, Disabled, DP, FALSE, Disabled, Adv, SA,mcast l2, mcast 0.0.0.0, 0.0.0.0, 0.0.0.0, 0.0.0.0, l3, IR BGP,MS Adm St, Reo Disabled, Down, Disabled, Down, 0.0.0.0 0.0.0.0 Nve1 Vni, Mcast, Mode, 1 10018, 0.0.0.0, 10018, 0.0.0.0, Type, Flags UcastStatic, L2, None UcastStatic, L2, None Nve1 Vni, Mcast, Mode, 1 - 10015, 0.0.0.0, Type, Flags UcastStatic, L2, None Allowed VLANs - 1,3-4,13,15,18,161,375 1,3-4,13,15,18,161,375 Local suspended VLANs - 15,375
Request to improve the suspended error message to point to the reason why it is suspended and/or add VNI configurations to "show vpc consistency-parameters global".