Connecting two 6509's across a WAN/MAN

Discussion in 'Cisco' started by Wes Kaufmann, Jul 14, 2003.

  1. Wes Kaufmann

    Wes Kaufmann Guest

    I need to directly connect two 6509's with MFSCs across a 100 MB WAN
    connection. Currently vlan1 on both sides have two different subnets.

    What are the design considerations for such a change?

    One group would like to trunk/bridge and have one vlan1 but still
    layer3 route some subnets between the two 6509s. Why would we do this
    and how?

    Personally I would prefer just to do all layer 3 routing since I see
    no good reason to have the managment vlan the same and we do have a
    requirement that both sites must be a COOP/DR site for the other.
    Also, some subnets need to stay on one site or the other and not both.
    Wes Kaufmann, Jul 14, 2003
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  2. Wes Kaufmann

    mliu Guest

    I suggest you trunk the two by using 802.1q with the native vlan set up
    on both end - any vlan number except for vlan 1 which is already in use
    on both switches in difference ways. In this way, there would be no
    interference with the exsiting configuration.

    Afterwards, you create Layer 3 connectivity (a dedicated vlan) for this
    link and use a /30 IP combo on both interfaces for routing purpose.

    Then estalish your routing protocol to advertise the network on both end.

    Hope it helps.
    mliu, Jul 14, 2003
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  3. Wes Kaufmann

    melanthor Guest

    Go with the Layer 3 solution. If you ever go with HSRP or redundant
    connections, you are better off with Layer 3. You do not have to wait for
    spanning-tree if a line goes down.
    melanthor, Jul 17, 2003
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