InterVLAN routing issues

Discussion in 'Cisco' started by ranak3@gmail.com, Dec 3, 2007.

  1. Guest

    The company that I work for has a linked 3750 switch stack that was
    only working as a Layer 2 switch and sent all Layer 3 to a external
    3745 router via sub-interfaces for inter-VLAN routing. Everything
    worked fine, but a little slow. The subnets were 172.16.x.x/22,
    172.17.x.x/22 and 172.18.x.x/22. I added two new subnets (172.16.128.x/
    24 and 172.16.130.x/24) on the 3745 for eventual migration to shorten
    the subnets and move servers off of the user VLAN.

    This weekend I turned on IP routing on the 3750 switch stack, moved
    the VLAN IP gateway addresses to VLAN interfaces on the switch stack
    and got them off of the sub-interfaces on the router, turned on EIGRP,
    changed the link to the external 3745 to a Layer 3 routed interface
    and made a few other minor tweaks and route changes to get the network
    up and running.

    But one thing that I am noticing is that the VLAN interfaces are not
    showing the traffic that should be flowing over those interfaces.
    Everything is working and no users have reported issues, but I still
    cannot see traffic on the VLAN interface. Any ideas?
    , Dec 3, 2007
    #1
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  2. Trendkill Guest

    On Dec 3, 2:49 pm, wrote:
    > The company that I work for has a linked 3750 switch stack that was
    > only working as a Layer 2 switch and sent all Layer 3 to a external
    > 3745 router via sub-interfaces for inter-VLAN routing. Everything
    > worked fine, but a little slow. The subnets were 172.16.x.x/22,
    > 172.17.x.x/22 and 172.18.x.x/22. I added two new subnets (172.16.128.x/
    > 24 and 172.16.130.x/24) on the 3745 for eventual migration to shorten
    > the subnets and move servers off of the user VLAN.
    >
    > This weekend I turned on IP routing on the 3750 switch stack, moved
    > the VLAN IP gateway addresses to VLAN interfaces on the switch stack
    > and got them off of the sub-interfaces on the router, turned on EIGRP,
    > changed the link to the external 3745 to a Layer 3 routed interface
    > and made a few other minor tweaks and route changes to get the network
    > up and running.
    >
    > But one thing that I am noticing is that the VLAN interfaces are not
    > showing the traffic that should be flowing over those interfaces.
    > Everything is working and no users have reported issues, but I still
    > cannot see traffic on the VLAN interface. Any ideas?


    What do you mean you don't see the traffic on the vlan interfaces?
    You don't see anything in the 'output', or are you looking at the tx/
    rx load? I dont have any experience with stacks, but which 3750 has
    the routing vlans on it or do all of them somehow integrate in the
    stack? If no one is complaining, and routing is working, i'm
    wondering if you are just looking at something that does not increment
    on a SVI. Are you running a sniffer? Have you moved any of the
    clients to the new networks yet? Which vlans are you monitoring and
    how?
    Trendkill, Dec 3, 2007
    #2
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