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  1. Does the Dual home method 2 and method 3 varies in costs to the enterprise? or same?


  2. Hello Srinivasan

    The Dual homed method 2 involves two separate ISP routers from the SAME ISP. This would most likely increase the cost of the solution compared to method 1 because of the fact that you require your ISP to provide you with two pieces of equipment on their end.

    Method 3 would most likely be even more expensive, because you are purchasing connectivity to two DIFFERENT ISPs, so you can’t take advantage of any discounts the single ISP may give you for multiple links.

    What I’m describing is the most probable case concerning cost. Ultimately it depen

    ... Continue reading in our forum

  3. Hello Alexander

    In order to run a redundancy gateway protocol on two edge routers with a single ISP router, you’d need some infrastructure between the edge routers and the ISP routers like a switch. It is possible, but this would introduce a new single point of failure and this is not desired especially on the edge of the network.


    That would also mean that if your edge routers are performing NAT, you would require three public IP addresses, one for each ... Continue reading in our forum

  4. Would it be possible to go over the configurations for a scenario in which my network is connected to two ISPS which are connected to two VSS 4500 Chassis? Comcast AS is 6233 along with local AS 6223 I’m also connected to Centurylink they have an AS of 6247 and a local AS of 6237. Is there a way to make this work over VRF? I’m having trouble with this because VSS is seens as one router but I have two AS numbers.

  5. Hello Jason

    If I understood the configuration correctly, then the 4500 VSS devices are customer devices which connect to each individual ISP, correct? If this is the case, then the configuration that you are looking at is Single Multihomed:


    Even though you are using two devices, they are still viewed as one. The limitation here is that the VSS as a whole cannot belong to two ASs. Each router can only be assigned to a single AS. So if these VSS configu... Continue reading in our forum

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