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I have formed vPC over Nexus-9K and there is one arista downstream switch connected to vPC members like below. Port-channel between arista and vpc are in trunk mode and lacp is set to active-active on both (vPC & downstream SW) . I have created vlan 20 on all 3 switches. But i can see two root bridge for vlan 20. One is CORE-NX-S1 & another is downstream arista sw. How is this possible. Even if priority is same, only one should be root bridge comparing MAC address. Also I tried disabling MST but it still appears. But also i have enabled rstp mode in arista. Is it like they are not receiving each other BPDU’s which end up electing themselves as root bridges?
ACC-S1(config)#no spanning-tree mode mst ACC-S1(config)#no spanning-tree vlan 20 root ACC-S1(config)#sh spanning-tree vlan 20 Bridge ID Priority 32768 (priority 32768 sys-id-ext 0) Interface Role State Cost Prio.Nbr Type
ACC-S1(config)#sh run | b Ethernet7
ACC-S1(config)#sh run | b Port-Channel20
CORE-NX-S1# sh spanning-tree VLAN0001 Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Interface Role Sts Cost Prio.Nbr Type
VLAN0020 Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Interface Role Sts Cost Prio.Nbr Type CORE-NX-S1#
CORE-NX-S1# sh run (unwanted output omitted) vlan 1,20 vrf context management
interface port-channel1
interface port-channel20
interface Ethernet1/2
interface Ethernet1/3
interface Ethernet1/7
CORE-NX-S2# sh spanning-tree vlan 20 VLAN0020 Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Interface Role Sts Cost Prio.Nbr Type
CORE-NX-S2# sh vpc brief vPC domain id : 1 vPC Peer-link status vPC status
Is there anything i need to add on arista ?
Any suggestion would be appreciated. Thankyou Nick |
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