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  1. #1
    Join Date
    Mar 2009

    inter-VLAN router with in/out policers, ipv6

    Can you make a recommendation for a switch-based L3 router which can
    - hold a moderate number of routes (interface routes, a few hundred statics + default)
    - OSPF and BGP
    - MST
    - 1024 layer-3 dot1q subinterfaces (or maybe VLAN interfaces)
    + traffic policing in and out per subinterface/vlan
    - IPv4 & IPv6 native
    - 2x GigE ports
    - Not tip-over under 1gbps DDoS towards a VLAN interface.

    I've been using 3560Gs, but they seem to lack the output traffic policing. I'd prefer to have subinterfaces which don't run spanning-tree, versus Vlan Interfaces to a trunk interface which runs spanning-tree. These switches sit at the L3 boundary between two L2 networks.

    Cost is a big factor; but I also must carry vendor licenses & support contract, if the vendor asserts that not doing so is illegal in US.
    Last edited by speedcolo; 10-11-2009 at 07:34 PM.

  2. #2
    Join Date
    Apr 2004
    what did you end up deciding on? What type of L3 performance are you running through what you chose? I'm trying to decide on a good L3 switch as a "core" router right now too.... any advice?

  3. #3
    Join Date
    Mar 2009
    For the "budget end", I'm using a pair of Catalyst 4506s with SupIV (WS-X4515), bonded 6xGigE uplink (WS-X4306-GB=) and bonded 6xGigE 802.1q downlink (WS-X4306-GB=) to a stack of six 48-port L2 gigE switches. The switches at this installation carry Internet traffic, but also SAN and other higher-rate traffic.

    The specs on the 4506+supIV claim to support 48 mpps, which would be about 20gbps of DoS attack traffic (at 52 byte packets). However, I have not tested this, and typical traffic through the L3 router is sub-gigabit in this application. The bonded gigE is used only to handle smaller DoS attacks until ACLs can be applied upstream. Cost for a pair of these routers is about $3.5k + $3k/yr maintenance contract.

    In many situations, you would prefer to use a pair of chassis switch/routers, rather than a separate L3 router and L2 switching network. I am also using pairs of C6509s + sup720 + 3bxl, plus 6x WS-X6548-GE-TX per chassis, costing about $76k per pair + $6k/year maintenance contract.

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