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Routing on HP 1910

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  • 1.  Routing on HP 1910

    Posted Jun 13, 2016 11:04 AM

    Hi folks.

    I'm checking my environment and during this checkup a question emerges. I know that HP 1910 48G has some layer 3 capabilities. I'm using this switch only with a layer 2 switch because I have a L3 SW on my environment.

    If the responsibility to route between VLANs is attached to the L3 SW, and in all my L2 switches I have already defined a default gateway (L3 SW), what is the necessity to maintain an IPv4 route to default gw? An image is attached.


  • 2.  RE: Routing on HP 1910

    Posted Jun 13, 2016 01:27 PM

    Maybe I'm wrong here...but if your LAN has a Layer 3 Appliance and this one (Firewall/Router) acts as Default Gateway for any connected VLAN you defined in your environment (I mean: VLANs connected using the same DG physical interface configured accordingly or VLANs connected using different physical interfaces physically separated, one interface for each seen single VLAN) then any Switch defined IPv4 route to any Default Gateway shouldn't be *so* mandatory for any client to reach its DG beacuse all (traffic flow), VLAN too, is ruled at Layer 2 level. Isn't it?

  • 3.  RE: Routing on HP 1910

    Posted Jun 13, 2016 02:14 PM

    If your not using L3 functionality, you still need gateway set for reachability beyond the VLAN having IP address.

    Examples are access to public NTP server, management from different subnets to name a few

  • 4.  RE: Routing on HP 1910

    Posted Jun 13, 2016 08:48 PM

    The switch itself is a host on the network.

    It needs a default route/default GW for the same reasons that any other host (eg a PC, server, or phone) might need one.

  • 5.  RE: Routing on HP 1910

    Posted Jun 14, 2016 06:53 AM

    Definitely. That doesn't necessarily mean that the Switch needs to provide its Route to a DG to other hosts on the network it manages.

    For its internal uses (NTP, DNS resolution, etc.) to have a Route defined to a DG is important (mandatory), I know that...but I thought the question was more related to why to provide it to other hosts in the Network (so "externally" to the Switch) where those hosts yet know how to (because are yet configured to) reach their DG.

    Probably I misunderstood the question or the scenario.

  • 6.  RE: Routing on HP 1910

    Posted Jun 14, 2016 08:43 AM

    What I want to say is whether the SW works only over the mac address layer, what is the point to insert a route using the network layer if the box does not understand IP address? I know that this switch model is a bit powerful than the default L2 switches but I don't want this box (1910) working with a power of L3.

    All the Vlans and Vlans interfaces are on L3 switch as well as the IPv4 routes.
    The hosts are pointed to DG.

    Thanks in advance to everyone.


  • 7.  RE: Routing on HP 1910

    Posted Jun 15, 2016 05:21 AM

    If you don't want this 1910 to act as a router.... don't  set default gateway on any host to the 1910 IP address. afaik, there's no command like "ip routing" like in the Cisco world to turn on/off routing capabilities

    If you want the 1910 to be reachable beyond it's own subnet, you need to set a default gateway on it,  just like you need to on any IP device