Collection of NotesCiscoCisco N9k – Double-Sided vPC
Collection of NotesCiscoCisco N9k – Double-Sided vPC
Cisco

Cisco N9k – Double-Sided vPC

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1. Test Environment

Double-sided vPC is also called Back-to-Back vPC.

Test devices are:

  • SD: Nexus9000 C9372PX version 9.3(10)
  • SS: Nexus9000 C93180YC-EX version 10.3(6)

2. Config

spanning-tree pathcost method long spanning-tree port type edge bpduguard default spanning-tree vlan 1-3967 priority 0 vpc domain 50 peer-switch role priority 10 peer-keepalive destination 10.82.140.115 source 10.82.140.114 delay restore 150 peer-gateway ip arp synchronize int eth1/1-2 description To SD002 switchport switchport mode trunk channel-group 12 mode active no shutdown interface port-channel12 description vPC Peerlink to SD002 switchport switchport mode trunk spanning-tree port type network vpc peer-link int eth1/3-4 description To SS001 switchport switchport mode trunk channel-group 100 mode active no shutdown int eth1/5-6 description To SS002 switchport switchport mode trunk channel-group 100 mode active no shutdown interface port-channel100 switchport switchport mode trunk vpc 100
spanning-tree pathcost method long spanning-tree port type edge bpduguard default spanning-tree vlan 1-3967 priority 0 vpc domain 50 peer-switch role priority 20 peer-keepalive destination 10.82.140.114 source 10.82.140.115 delay restore 150 peer-gateway ip arp synchronize int eth1/1-2 description To SD001 switchport switchport mode trunk channel-group 12 mode active no shutdown interface port-channel12 description vPC Peerlink to SD001 switchport switchport mode trunk spanning-tree port type network vpc peer-link int eth1/3-4 description To SS002 switchport switchport mode trunk channel-group 100 mode active no shutdown int eth1/5-6 description To SS001 switchport switchport mode trunk channel-group 100 mode active no shutdown interface port-channel100 switchport switchport mode trunk vpc 100
spanning-tree pathcost method long spanning-tree port type edge bpduguard default spanning-tree vlan 1-3967 priority 8192 vpc domain 100 peer-switch role priority 10 peer-keepalive destination 10.82.140.117 source 10.82.140.116 delay restore 150 peer-gateway ip arp synchronize int eth1/1-2 description To SS002 switchport switchport mode trunk channel-group 12 mode active no shutdown interface port-channel12 description vPC Peerlink to SS002 switchport switchport mode trunk spanning-tree port type network vpc peer-link int eth1/3-4 description To SD001 switchport switchport mode trunk channel-group 100 mode active no shutdown int eth1/5-6 description To SD002 switchport switchport mode trunk channel-group 100 mode active no shutdown interface port-channel100 switchport switchport mode trunk vpc 100
spanning-tree pathcost method long spanning-tree port type edge bpduguard default spanning-tree vlan 1-3967 priority 8192 vpc domain 100 peer-switch role priority 20 peer-keepalive destination 10.82.140.116 source 10.82.140.117 delay restore 150 peer-gateway ip arp synchronize int eth1/1-2 description To SS001 switchport switchport mode trunk channel-group 12 mode active no shutdown interface port-channel12 description vPC Peerlink to SS001 switchport switchport mode trunk spanning-tree port type network vpc peer-link int eth1/3-4 description To SD002 switchport switchport mode trunk channel-group 100 mode active no shutdown int eth1/5-6 description To SD001 switchport switchport mode trunk channel-group 100 mode active no shutdown interface port-channel100 switchport switchport mode trunk vpc 100

3. Show Output

N9K-SD001# show vpc Legend: (*) – local vPC is down, forwarding via vPC peer-link vPC domain id : 50 Peer status : peer adjacency formed ok vPC keep-alive status : peer is alive Configuration consistency status : success Per-vlan consistency status : success Type-2 consistency status : success vPC role : primary Number of vPCs configured : 1 Peer Gateway : Enabled Dual-active excluded VLANs : – Graceful Consistency Check : Enabled Auto-recovery status : Disabled Delay-restore status : Timer is off.(timeout = 150s) Delay-restore SVI status : Timer is off.(timeout = 10s) Operational Layer3 Peer-router : Disabled Virtual-peerlink mode : Disabled vPC Peer-link status ——————————————————————— id Port Status Active vlans — —- —— ————————————————- 1 Po12 up 1 vPC status —————————————————————————- Id Port Status Consistency Reason Active vlans — ———— —— ———– —— ————— 100 Po100 up success success 1
N9K-SD002# show vpc Legend: (*) – local vPC is down, forwarding via vPC peer-link vPC domain id : 50 Peer status : peer adjacency formed ok vPC keep-alive status : peer is alive Configuration consistency status : success Per-vlan consistency status : success Type-2 consistency status : success vPC role : secondary Number of vPCs configured : 1 Peer Gateway : Enabled Dual-active excluded VLANs : – Graceful Consistency Check : Enabled Auto-recovery status : Disabled Delay-restore status : Timer is off.(timeout = 150s) Delay-restore SVI status : Timer is off.(timeout = 10s) Operational Layer3 Peer-router : Disabled Virtual-peerlink mode : Disabled vPC Peer-link status ——————————————————————— id Port Status Active vlans — —- —— ————————————————- 1 Po12 up 1 vPC status —————————————————————————- Id Port Status Consistency Reason Active vlans — ———— —— ———– —— ————— 100 Po100 up success success 1
N9K-SS001# show vpc Legend: (*) – local vPC is down, forwarding via vPC peer-link vPC domain id : 100 Peer status : peer adjacency formed ok vPC keep-alive status : peer is alive Configuration consistency status : success Per-vlan consistency status : success Type-2 consistency status : success vPC role : primary Number of vPCs configured : 1 Peer Gateway : Enabled Dual-active excluded VLANs : – Graceful Consistency Check : Enabled Auto-recovery status : Disabled Delay-restore status : Timer is off.(timeout = 150s) Delay-restore SVI status : Timer is off.(timeout = 10s) Delay-restore Orphan-port status : Timer is off.(timeout = 0s) Operational Layer3 Peer-router : Disabled Virtual-peerlink mode : Disabled vPC Peer-link status ——————————————————————— id Port Status Active vlans — —- —— ————————————————- 1 Po12 up 1 vPC status —————————————————————————- Id Port Status Consistency Reason Active vlans — ———— —— ———– —— ————— 100 Po100 up success success 1
N9K-SS002# show vpc Legend: (*) – local vPC is down, forwarding via vPC peer-link vPC domain id : 100 Peer status : peer adjacency formed ok vPC keep-alive status : peer is alive Configuration consistency status : success Per-vlan consistency status : success Type-2 consistency status : success vPC role : secondary Number of vPCs configured : 1 Peer Gateway : Enabled Dual-active excluded VLANs : – Graceful Consistency Check : Enabled Auto-recovery status : Disabled Delay-restore status : Timer is off.(timeout = 150s) Delay-restore SVI status : Timer is off.(timeout = 10s) Delay-restore Orphan-port status : Timer is off.(timeout = 0s) Operational Layer3 Peer-router : Disabled Virtual-peerlink mode : Disabled vPC Peer-link status ——————————————————————— id Port Status Active vlans — —- —— ————————————————- 1 Po12 up 1 vPC status —————————————————————————- Id Port Status Consistency Reason Active vlans — ———— —— ———– —— ————— 100 Po100 up success success 1

4. Troubleshooting

Another topology is used.

4.1 Normal Status

SS002(config)# do show port-channel summary Flags: D – Down P – Up in port-channel (members) I – Individual H – Hot-standby (LACP only) s – Suspended r – Module-removed b – BFD Session Wait S – Switched R – Routed U – Up (port-channel) p – Up in delay-lacp mode (member) M – Not in use. Min-links not met ——————————————————————————– Group Port- Type Protocol Member Ports Channel ——————————————————————————– 12 Po12(SU) Eth LACP Eth1/8(P) 20 Po20(SU) Eth NONE Eth1/49(P) 30 Po30(SU) Eth NONE Eth1/5(P) 100 Po100(SU) Eth LACP Eth1/3(P) Eth1/4(P) SS002(config-if)# do show vpc Legend: (*) – local vPC is down, forwarding via vPC peer-link vPC domain id : 60 Peer status : peer adjacency formed ok vPC keep-alive status : peer is alive Configuration consistency status : success Per-vlan consistency status : success Type-2 consistency status : success vPC role : secondary Number of vPCs configured : 3 Peer Gateway : Enabled Dual-active excluded VLANs : – Graceful Consistency Check : Enabled Auto-recovery status : Disabled Delay-restore status : Timer is off.(timeout = 150s) Delay-restore SVI status : Timer is off.(timeout = 10s) Operational Layer3 Peer-router : Disabled Virtual-peerlink mode : Disabled vPC Peer-link status ——————————————————————— id Port Status Active vlans — —- —— ————————————————- 1 Po12 up 1,10,20,30 vPC status —————————————————————————- Id Port Status Consistency Reason Active vlans — ———— —— ———– —— ————— 20 Po20 up success success 20 30 Po30 up success success 30 100 Po100 up success success 1,10,20,30

4.2 Crosslink Down Status

SS001(config-if)# do show port-channel summary Flags: D – Down P – Up in port-channel (members) I – Individual H – Hot-standby (LACP only) s – Suspended r – Module-removed b – BFD Session Wait S – Switched R – Routed U – Up (port-channel) p – Up in delay-lacp mode (member) M – Not in use. Min-links not met ——————————————————————————– Group Port- Type Protocol Member Ports Channel ——————————————————————————– 12 Po12(SU) Eth LACP Eth1/3(P) 20 Po20(SU) Eth NONE Eth1/49(P) 30 Po30(SU) Eth NONE Eth1/5(P) 100 Po100(SU) Eth LACP Eth1/4(P) Eth1/8(D) SS002(config-if)# do show port-channel summary Flags: D – Down P – Up in port-channel (members) I – Individual H – Hot-standby (LACP only) s – Suspended r – Module-removed b – BFD Session Wait S – Switched R – Routed U – Up (port-channel) p – Up in delay-lacp mode (member) M – Not in use. Min-links not met ——————————————————————————– Group Port- Type Protocol Member Ports Channel ——————————————————————————– 12 Po12(SU) Eth LACP Eth1/8(P) 20 Po20(SU) Eth NONE Eth1/49(P) 30 Po30(SU) Eth NONE Eth1/5(P) 100 Po100(SU) Eth LACP Eth1/3(D) Eth1/4(P)

Even if the cross links are down, the back-to-back vPC is still up.

4.3 Only 1 Link is Up in the Back-to-Back vPC

VPC status is down on the 2 switches which has no active links. However, the vPC status is up on the 2 switches which has only 1 active link.

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