[nsp] HSRP and VLANs

[Pete Templin]

We now provision Ethernet handoffs using a /29, which leaves room for HSRP on our end and also on their end.

Since we're mostly providing IP transit, we route the customer's address space to their router, so YMMV.

Pete Templin
Senior Staff Engineer
TexLink Communications
(210) 892-4183
pete.templin at texlink.com


-----Original Message-----
From: Marco Matarazzo [mailto:marmata at libero.it]
Sent: Tuesday, December 16, 2003 7:53 AM
To: Jason Lixfeld
Cc: cisco-nsp at puck.nether.net
Subject: Re: [nsp] HSRP and VLANs

> 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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