[nsp] HSRP and VLANs

[Jason Lixfeld]

Even if you have enough IP addresses, I wouldn't turn HSRP up on your 
BGP links.  You actually gain less benefit doing that than you get by 
having 2 sessions spread across 2 routers.

On Dec 16, 2003, at 8:53 AM, Marco Matarazzo wrote:

>> 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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>