[nsp] HSRP and VLANs

[Marco Matarazzo]

> As I understand it, you need at least 3 IPs to do HSRP for one subnet
> or VLAN.  One IP for each physical interface on the router and one
> virtual IP which becomes the host's default gateway.  By the sounds of
> it, you may need to expand the subnets for each of those 50 VLANs (if
> you have promised each customer in the vlan 6 or 14 usable IP
> addresses, depending) for each  .  I don't know if you can do
> unnumbered HSRP.

Good point Jason! But I wonder how one can deliver a point to point
connection (I also have a couple of BGP downstreams) with a  /30, and have
redundancy... there should been something we missed! At least I hope so! :)
Someone that can enlighten us?

Thanks,
]\/[arco

On Dec 16, 2003, at 7:31 AM, Marco Matarazzo wrote:

> Hi all,
>
> right now I terminate the customer circuits on a single Cisco 7204VXR,
> speaking BGP with two upstreams, and delivering all the vlans to colo
> customers.
> I've been asked to add redundancy at routing level, and I was planning
> to
> add another Cisco 7204, speaking BGP with one upstream, and let the
> other
> Cisco speak BGP with only the other one. The two routers will of
> course iBGP
> between them. Now the question: we have 50 vlans, each one assigned
> his /28
> or /29 depending on the customer, so I've 50 different default
> gateways. Is
> that possible to do HSRP between the two routers on such a number of
> IPs?
> (And have space to grow of course!). Or is there some other way to do
> it?
>
> Thanks a lot!
> ]\/[arco
>
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