VPC概念
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VPC：vpc是指vpc对等体设备和下游设备之间的组合PortChannel。
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vpc对等交换：就是组成vpc功能的两个nexus系列交换机，一个设备为主，一个为备。
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vpc对等连接：用于同步vpc对等设备之间状态的连接。vpc对等链路在两个vpc交换机之间携带控制通信量，还有组播、广播数据通信量。在某些链路故障场景中，还携带单播通信量。对等链路至少是两个10GE接口。
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vpc域：该域包括vpc对等设备、vpc对等保持活动连接和连接到下游设备的vpc中的所有PortChannels。同时，所有关于vpc的全局配置都关联到vpc域下。
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vpc对等保持活动连接（心跳线）：对等保持活动连接监视vpc对等交换机的生命力。在vpc对等设备之间发送周期性的保持活动连接。vpc对等活动连接可以是管理接口（MGMT）或交换机虚拟接口（SVI），但不可以使用物理接口。没有数据或同步流量在vpc登对保持活动连接上移动；该连接上的唯一通信量是表明交换机正在操作和运行vpc的消息。
一、背景需求
Cisco 两台交换机需要虚拟成一台交换机使用（类似 交换机堆叠），去链接二层接入交换机，提供网络链路高可用。如下图：
对于二层交换 2960x 需要看到 上层的两台 N3k 交换为一台设备，中间连接链路做链路聚合。
二、配置详解
N3K_1和 N3K2 配置保持一致
1、全局下开启 VPC + HSRP+ospf
feature vpc
feature hsrp
feature ospf
2、配置 VPC 域ID
vpc domain 30 role priority 8192 # N3K_1:8192 N3K_2:16384 设置角色优先级 peer-keepalive destination 10.8.240.21 source 10.8.240.20 #IP 为MGMT地址 peer-gateway auto-recovery
3、VPC peer-link 接口配置
interface Ethernet1/49
switchport mode trunk
channel-group 49 mode active
interface Ethernet1/50
switchport mode trunk
channel-group 49 mode active
interface port-channel49
speed 40000
description vPc peer-link
switchport mode trunk
spanning-tree port type network
vpc peer-link
4、下联接口配置
interface Ethernet1/51/1
speed 10000
switchport mode trunk
channel-group 50 mode active
no shutdown
interface port-channel50
speed 10000
switchport mode trunk
vpc 50 #两台N3K 的VPC ID 必须一致
2960X交换机配置
1:、接口配置（和普通链路聚合配置一样）
interface TenGigabitEthernet1/0/1
switchport mode trunk
channel-group 24 mode active
interface TenGigabitEthernet1/0/2
switchport mode trunk
channel-group 24 mode active
interface Port-channel24
switchport mode trunk
三、hsrp+ospf 配置
N3k_1:
interface Vlan10
no shutdown
ip address 192.168.0.2/24
ip router ospf 10 area 0.0.0.20 #ospf 路由发布
hsrp version 2
hsrp 10
preempt
priority 105
ip 192.168.0.1
track 1
track 1 interface Ethernet1/48 line-protocol
N3k_2:
interface Vlan10
no shutdown
ip address 192.168.0.3/24
ip router ospf 10 area 0.0.0.20
hsrp version 2
hsrp 10
ip 192.168.0.1
track 1
track 1 interface Ethernet1/48 line-protocol
四、查看配置
N3k-core-01# show vpc Legend: (*) - local vPC is down, forwarding via vPC peer-link vPC domain id : 30 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, operational secondary Number of vPCs configured : 6 Peer Gateway : Enabled Peer gateway excluded VLANs : - Dual-active excluded VLANs : - Graceful Consistency Check : Enabled Auto-recovery status : Enabled (timeout = 240 seconds) vPC Peer-link status --------------------------------------------------------------------- id Port Status Active vlans -- ---- ------ -------------------------------------------------- 1 Po49 up all vPC status ---------------------------------------------------------------------------- id Port Status Consistency Reason Active vlans ------ ----------- ------ ----------- -------------------------- ----------- 50 Po50 up success success all 51 Po51 up success success all 52 Po52 up success success all 53 Po53 up success success all
N3k-core-01# show vpc statistics peer-link port-channel49 is up Hardware: Port-Channel, address: 0062.ecef.8e5c (bia 0062.ecef.8e5c) Description: vPc peer-link MTU 9216 bytes, BW 80000000 Kbit, DLY 10 usec reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA Port mode is trunk full-duplex, 40 Gb/s Input flow-control is off, output flow-control is off Switchport monitor is off EtherType is 0x8100 Members in this channel: Eth1/49, Eth1/50 Last clearing of "show interface" counters never 1 interface resets Load-Interval #1: 30 seconds 30 seconds input rate 13194296 bits/sec, 5755 packets/sec 30 seconds output rate 1558864 bits/sec, 802 packets/sec Load-Interval #2: 5 minute (300 seconds) input rate 11.66 Mbps, 5.24 Kpps; output rate 1.49 Mbps, 625 pps RX 53092855268 unicast packets 943847523 multicast packets 37779519 broadcast packets 54074482310 input packets 12067581932262 bytes 3615421391 jumbo packets 0 storm suppression packets 0 runts 0 giants 0 CRC 0 no buffer 0 input error 0 short frame 0 overrun 0 underrun 0 ignored 0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop 0 input with dribble 0 input discard 0 Rx pause TX 27613649710 unicast packets 1107185465 multicast packets 48743817 broadcast packets 28769578992 output packets 4953197509995 bytes 1283510513 jumbo packets 0 output errors 0 collision 0 deferred 0 late collision 0 lost carrier 0 no carrier 0 babble 0 output discard 0 Tx pause
N3k-core-01# show hsrp brief P indicates configured to preempt. | Interface Grp Prio P State Active addr Standby addr Group addr Vlan10 10 105 P Active local 192.168.0.3 192.168.0.1 (conf) Vlan11 11 105 P Active local 1921.68.1.3 192.168.1.1 (conf) 。。。。。。
此篇博客为本人个人工作总结，仅供参看。谢谢