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STP root flapping on HP E-3800 Switches

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  • 1.  STP root flapping on HP E-3800 Switches

    Posted Feb 29, 2016 11:25 PM

    Hello every1

    Have two switches HP E-3800 (J-9575A) with each other, experiencing continuos root flapping., even after changing the priority.

    SW-1 - Priority 0

    SW-2 Priority 4096

     

    I 06/17/04 09:38:15 00839 stp: CST Root changed from 0:009c02-xxxxxx to

                4096:2c4138-xxxxxx

    I 06/17/04 09:38:15 00077 ports: port 1 is now off-line

    I 06/17/04 09:38:16 00839 stp: CST Root changed from 4096:2c4138-xxxxxx to

                0:009c02-xxxxxx

    I 06/17/04 09:38:16 00435 ports: port 13 is Blocked by STP

    I 06/17/04 09:38:16 00435 ports: port 16 is Blocked by STP

    I 06/17/04 09:38:16 00839 stp: CST Root changed from 0:009c02-xxxxxx to

                4096:2c4138-xxxxxx

    I 06/17/04 09:38:16 00839 stp: CST Root changed from 4096:2c4138-xxxxxx to

                0:009c02-xxxxxx

    I 06/17/04 09:38:16 00839 stp: CST Root changed from 0:009c02-xxxxxx to

    [24;1H[2K-- MORE --, next page: Space, next line: Enter, quit: Control-C[24;1H[24;1H[2K[24;1H[1;24r[24;1H            4096:2c4138-xxxxxx

    I 06/17/04 09:38:16 00839 stp: CST Root changed from 4096:2c4138-xxxxxx to

                0:009c02-xxxxxx

    I 06/17/04 09:38:20 00839 stp: CST Root changed from 0:009c02-xxxxxx to

                4096:2c4138-xxxxxx

    I 06/17/04 09:38:20 00839 stp: CST Root changed from 4096:2c4138-xxxxxx to

                0:009c02-xxxxxx

    I 06/17/04 09:38:20 00839 stp: CST Root changed from 0:009c02-xxxxxx to

                4096:2c4138-xxxxxx

    I 06/17/04 09:38:22 00435 ports: port 1 is Blocked by STP

    I 06/17/04 09:38:23 00839 stp: CST Root changed from 4096:2c4138-xxxxxx to

                0:009c02-xxxxxx

    I 06/17/04 09:38:23 00076 ports: port 1 is now on-line

    I 06/17/04 09:38:23 00435 ports: port 14 is Blocked by STP

    I 06/17/04 09:38:23 00002 vlan: VLAN90 virtual LAN disabled

    I 06/17/04 09:38:23 00002 vlan: VLAN106 virtual LAN disabled

    I 06/17/04 09:38:24 00076 ports: port 14 is now on-line

    I 06/17/04 09:38:24 00001 vlan: VLAN90 virtual LAN enabled

    I 06/17/04 09:38:24 00001 vlan: VLAN106 virtual LAN enabled

    I 06/17/04 09:38:45 00076 ports: port 13 is now on-line

    I 06/17/04 09:38:45 00076 ports: port 16 is now on-line

     


    #J9575
    #CSTROOT
    #e3800
    #STP
    #rootflapping
    #Spanningtree


  • 2.  RE: STP root flapping on HP E-3800 Switches

    Posted Feb 29, 2016 11:51 PM

    Below is the config snippet of the second switch.

     

    I 12/31/03 14:57:00 00077 ports: port 1 is now off-line

    I 12/31/03 14:57:07 00435 ports: port 1 is Blocked by STP

    I 12/31/03 14:57:09 00076 ports: port 1 is now on-line

    I 12/31/03 15:06:30 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 15:23:13 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    [24;1H[2K-- MORE --, next page: Space, next line: Enter, quit: Control-C[24;1H[24;1H[2K[24;1H[1;24r[24;1HI 12/31/03 15:39:56 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 15:56:39 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 16:13:52 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 16:30:35 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 16:47:18 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 17:04:02 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 17:20:45 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 17:37:28 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 17:54:11 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 18:11:25 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 18:17:09 00077 ports: port 1 is now off-line

    I 12/31/03 18:17:15 00435 ports: port 1 is Blocked by STP

    I 12/31/03 18:17:17 00076 ports: port 1 is now on-line

    [24;1H[2K-- MORE --, next page: Space, next line: Enter, quit: Control-C[24;1H[24;1H[2K[24;1H[1;24r[24;1HI 12/31/03 18:28:38 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    I 12/31/03 18:45:21 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

    W 12/31/03 18:59:01 00236 snmp: SNMP Security access violation from 172.xxx.xxx.xxx

    W 12/31/03 18:59:04 00236 snmp: SNMP Security access violation from 172.xxx.xxx.xxx

    W 12/31/03 18:59:07 00236 snmp: SNMP Security access violation from 172.xxx.xxx.xxx

    I 12/31/03 19:02:04 00828 lldp: PVID mismatch on port 10(VID unknown)with peer

                device port GigabitEthernet1/0/2

     



  • 3.  RE: STP root flapping on HP E-3800 Switches

    Posted Mar 01, 2016 02:38 AM

    Output only shows log events, what are switch configs, and which ports are interconnecting them.

    It seems like there's a VLAN mismatch on current link. Best practice is not using default VLAN1 for client/server devices, but allow VLAN1 UNTAGGED on thr link between switches.  Vlan1 is used by spanning tree



  • 4.  RE: STP root flapping on HP E-3800 Switches

    Posted Mar 31, 2016 07:36 AM


    Running configuration:

    ; J9575A Configuration Editor; Created on release #KA.15.03.3004
    ; Ver #01:00:01

    hostname "SW_Pri"
    module 1 type J9575x
    ip routing
    vlan 1
       untagged 1-8,12-14,16-22,24-26
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip address 172.18.0.6 255.255.240.0
       tagged 9-11
       no untagged 15,23
       exit
    vlan 2
       tagged 9-11
       no ip address
       exit
    vlan 3
       tagged 9-11
       no ip address
       exit
    vlan 50
       ip helper-address 172.18.0.18
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip address 172.18.240.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 60
       untagged 15,23
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.50
       ip address 172.18.176.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 70
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.192.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 80
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.208.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 90
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       tagged 7,9-11,14
       no ip address
       exit
    vlan 101
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.32.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 102
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.48.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 103
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.64.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 104
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.80.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 105
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.96.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 106
       tagged 7,14
       no ip address
       exit
    vlan 4
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.16.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    ip route 0.0.0.0 0.0.0.0 172.18.0.1
    snmp-server community "public" unrestricted
    snmp-server community "xxxxxx" operator
    snmp-server contact "xxxxxx" location "xxxxxx"
    spanning-tree
    spanning-tree 7 root-guard
    spanning-tree 9 root-guard
    spanning-tree priority 0
    oobm
       ip address dhcp-bootp
       exit
    no autorun
    no dhcp config-file-update
    no dhcp image-file-update
    password operator

    _____________________________________________________________________
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    _____________________________________________________________________

     

    Running configuration:

    ; J9575A Configuration Editor; Created on release #KA.15.03.3004
    ; Ver #01:00:01

    hostname "SW_SEC"
    module 1 type J9575x
    ip routing
    vlan 1
       untagged 1-8,12-14,16-22,24-26
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip address 172.18.0.7 255.255.240.0
       tagged 9-11
       no untagged 15,23
       exit
    vlan 2
       tagged 9-11
       no ip address
       exit
    vlan 3
       tagged 9-11
       no ip address
       exit
    vlan 50
       ip helper-address 172.18.0.18
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip address 172.18.240.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 60
       untagged 15,23
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.50
       ip address 172.18.176.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 70
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.192.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 80
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.208.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 90
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       tagged 7,9-11,14
       no ip address
       exit
    vlan 101
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.32.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 102
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.48.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 103
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.64.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 104
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.80.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 105
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.96.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    vlan 106
       name "VLAN106"
       tagged 7,14
       no ip address
       exit
    vlan 4
       ip helper-address 172.18.0.50
       ip helper-address 172.18.0.60
       ip helper-address 172.18.0.119
       ip helper-address 172.18.0.58
       ip helper-address 172.18.0.18
       ip address 172.18.16.1 255.255.240.0
       tagged 1,7,9-11,14
       exit
    ip route 0.0.0.0 0.0.0.0 172.18.0.1
    snmp-server community "public" unrestricted
    snmp-server community "xxxxxx" operator
    snmp-server contact "xxxxxx" location "xxxxxx"
    spanning-tree
    spanning-tree 7 root-guard
    spanning-tree 9 root-guard
    spanning-tree priority 1
    oobm
       ip address dhcp-bootp
       exit
    no autorun
    no dhcp config-file-update
    no dhcp image-file-update
    password operator



  • 5.  RE: STP root flapping on HP E-3800 Switches

    Posted Mar 31, 2016 01:22 PM

    Which port(s) are connected between the switches?  I hope these aren't ports 7<->7  or 9<->9



  • 6.  RE: STP root flapping on HP E-3800 Switches

    EMPLOYEE
    Posted Mar 01, 2016 02:45 PM

    I though STP was VLAN unaware but yes it is preferred if VLAN1 is untagged.

    Which link is causing the root change, port 1?

    Did you have a look at the spanning tree troubleshooting  document: http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c03396721 .