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HP 1920 divided into two switches

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  • 1.  HP 1920 divided into two switches

    Posted Jun 27, 2024 11:08 AM

    Hello,

    There is an HP 1920 switch with 24 ports, and it needs to be divided into two separate virtual switches. For example, port 1-8 is vlan 1, and port 9-24 is vlan 21. Both Vlans must use the same subnet, for example 10.0.0.1/24. Gateway 10.0.0.1 is plugged into port 1, computer 10.0.0.21 is plugged into port 21. Access of computer 10.0.0.21 to gateway 10.0.0.1 should appear only if both vlan-based virtual switches are connected via port 8 - 9.

    #
vlan 1
#
vlan 21
 description VLAN 0021 test
#
interface GigabitEthernet1/0/1 - 7
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/8
 port link-type hybrid
 port hybrid vlan 1 21 tagged
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/9
 port link-type hybrid
 port hybrid vlan 1 21 tagged
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/10 - 24
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#


  • 2.  RE: HP 1920 divided into two switches

    Posted Aug 07, 2024 09:38 AM

    Hi

    So, you want to split a switch in 2, and have a "physical" interconnect between them ?

    Strange (1920 is capable of routing) but nevermind :

    the only way to do it is :

    • disable spanning-tree (if you need STP, you're quite dead) or any other loop protection function.
    • don't use hybrid ports for 1/0/8 and 1/0/9 : only access (untagged)
      • 1/0/8 access vlan 1
      • 1/0/9 access vlan 21


    ------------------------------
    Frederic
    (kudos welcome)
    ------------------------------

    Original Message


  • 3.  RE: HP 1920 divided into two switches

    Posted Aug 14, 2024 01:20 AM

    Hi frmeunier.

    That's what I tried to do. I managed to do it on HP 1920S. But I can't do it on 1920. It looks like there are some configuration features in the old firmware. Any ideas on what to do?


    Original Message


  • 4.  RE: HP 1920 divided into two switches

    Posted Aug 14, 2024 03:26 AM

    please give the config you "tried to do" on the 1920 switch.(as what you gave in first post is not valid)

    Are you using the webgui or CLI to manage the 1920 ?



    ------------------------------
    Frederic
    (kudos welcome)
    ------------------------------

    Original Message


  • 5.  RE: HP 1920 divided into two switches

    Posted 29 days ago

    Hi frmeunier.

    I use webgui, but I can try via CLI too.

    Below I attach the configuration file

    #
 version 5.20.99, Release 1121
#
 sysname HPE
#
 domain default enable system 
#
 ipv6
#
 telnet server enable 
#
 ssl version ssl3.0 disable
#
 web idle-timeout 999
#
 password-recovery enable
#
vlan 1
#
vlan 21
 description VLAN 0021 test
#
domain system 
 access-limit disable 
 state active 
 idle-cut disable 
 self-service-url disable 
#
user-group system
 group-attribute allow-guest
#
local-user admin
 password cipher .....
 authorization-attribute level 3
 authorization-attribute user-profile admin
 service-type lan-access
 service-type ssh telnet terminal
 service-type ftp
 service-type web
#
 stp mode rstp
 stp enable
#
interface NULL0
#
interface Vlan-interface1
 ip address 192.168.74.254 255.255.255.0 
#
interface GigabitEthernet1/0/1
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/2
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/3
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/4
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/5
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/6
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/7
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/8
 port link-type hybrid
 port hybrid vlan 1 21 tagged
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/9
 port link-type hybrid
 port hybrid vlan 1 21 tagged
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/10
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/11
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/12
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/13
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/14
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/15
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/16
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/17
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/18
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/19
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/20
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/21
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/22
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/23
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/24
 port access vlan 21
 port auto-power-down
 stp edged-port enable
#
interface GigabitEthernet1/0/25
 stp edged-port enable
#
interface GigabitEthernet1/0/26
 stp edged-port enable
#
interface GigabitEthernet1/0/27
 stp edged-port enable
#
interface GigabitEthernet1/0/28
 stp edged-port enable
#
 ip route-static 0.0.0.0 0.0.0.0 192.168.74.1 preference 70
#
 undo info-center logfile enable
#
 ntp-service unicast-server 20.101.57.9
#
 ssh server enable
 sftp server enable
#
 ip https enable 
#
 load xml-configuration 
#
user-interface aux 0
 authentication-mode scheme
user-interface vty 0 15
 authentication-mode scheme
#
return


    Original Message


  • 6.  RE: HP 1920 divided into two switches

    Posted 28 days ago

    Hi Raul

    STP is enabled on ports 8 and 9 : you must disable it at least on these two.

    As previously advised, do not use hybrid configuration but access instead :

    interface GigabitEthernet1/0/8
     port link-type access
     port access vlan 1
     port auto-power-down
     undo stp enable
    #
    interface GigabitEthernet1/0/9
     port link-type access
     port access vlan 21
     port auto-power-down
     undo stp enable



    ------------------------------
    Frederic
    (kudos welcome)
    ------------------------------

    Original Message