I am having a very strange
spanning-tree issue with Cisco Nexus switches.
My server is connected to the
TOR switch with trunk configuration because we have multiple VLANs on the server. When I reboot the server it creates chaos in spanning tree; and, because of that, my network freezes live traffic for few seconds until spanning-tree get settled down. This is very odd.
SW2 are configured in
vPC and I have configured
VLAN 100 in HSRP configuration. I am having this issue with only the VLAN 100 traffic.
SW2 spanning tree configuration:
spanning-tree loopguard default spanning-tree vlan 10,20,30,40,100 priority 8192
Spanning tree details:
sw1# sh spanning-tree vlan 100 VLAN0100 Spanning tree enabled protocol rstp Root ID Priority 8292 Address 0023.04ee.be01 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 8292 (priority 8192 sys-id-ext 100) Address 0023.04ee.be01 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
interface Vlan100 description *** VLAN 100 *** no shutdown mtu 9216 no autostate no ip redirects ip address 22.214.171.124/23 no ip ospf passive-interface ip router ospf 100 area 0.0.0.0 hsrp 1 preempt priority 110 ip 126.96.36.199
On TOR switch port e1/27 connected to the server:
interface Ethernet1/27 description Connected to server switchport mode trunk switchport trunk allowed vlan 10,20,30,100 spanning-tree port type edge spanning-tree bpduguard enable
The issue occurs every single time I physically reboot the server. It causes my
spanning-tree topology to change which disturbs vlan 100 traffic and I see lots of packet drops.
You can see here on TOR switch, port
e1/27 just changed topology:
swt-tor# show spanning-tree detail | inc ieee|occurr|from Number of topology changes 69 last change occurred 0:13:50 ago from Ethernet1/27 Number of topology changes 69 last change occurred 0:13:50 ago from Ethernet1/27 Number of topology changes 69 last change occurred 0:13:50 ago from Ethernet1/27 Number of topology changes 5 last change occurred 69:38:03 ago from port-channel36 Number of topology changes 69 last change occurred 0:13:50 ago from Ethernet1/27
How do I tell spanning tree to not change spanning tree on the connected server trunk port?
How this is impacting only VLAN 100 (HSRP interface)?