Cisco Cisco Nexus 5010 Switch 디자인 가이드
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agg(config)# vpc domain 1
agg1(config-vpc-domain)# role priority 100
agg2(config-vpc-domain)# role priority 110
There are no functional issues when the spanning-tree root and vPC primary node do not match. This can only
cause some suboptimal convergence time due to spanning-tree resynchronization when the peer link is flapped or
a vPC device is reloaded.
Because of this, in case you want to restore the original mapping between the spanning-tree root and vPC primary
device, you can follow this procedure on the secondary, operational primary device:
1. Enter the vPC domain configuration, vpc domain <domain_id> (same vPC domain you are using).
2. Reset the vPC role priority with the command vpc role priority <priority_number> (reentering the same
priority is all right).
3. Perform a shut-no shut operation over the peer link.
Alternatively, you can create a script (which you should customize):
7k-1(config)# cli alias name vpcpreempt conf t ; vpc domain <number> ; role
priority 32767 ; int po 10 ; shut ; no sh
priority 32767 ; int po 10 ; shut ; no sh
7k-1(config)# show cli alias
CLI alias commands
==================
alias :show cli alias
vpcpreempt :conf t ; vpc domain 10 ; role priority 32767 ; int po 10 ; shut ;
no sh
no sh
vPC Peer Link
This PortChannel should be configured on dedicated-mode 10 Gigabit Ethernet interfaces across two different
10 Gigabit Ethernet line cards:
agg(config)# interface port-channel10
agg(config-if)# vpc peer-link
agg(config-if)# switchport trunk allowed vlan <all access vlans>
Configuration for Single 10 Gigabit Ethernet Card
Although it is possible to use a single 10 Gigabit Ethernet card on the Cisco Nexus 7000 Series for both core
connectivity and the peer link is possible, it is not the most desirable option. If you lose the 10 Gigabit Ethernet card
on the vPC primary, you lose not only core connectivity, but also the peer link. As a result, ports will be shut down
on the peer vPC device, isolating the servers completely.