[cisco-bba] Using more than one IP Local Pool

[Arie Vayner]

Cisco has an interesting feature called ODAP (On Demand Address Pools). The
idea is that the router will go and request additional pools from a DHCP
server whenever a utilization threshold has been hit. It also has the
capablity to release pools back (on router restart or if utilization went
down).

I do not think it is widely implemented, but I have implemented it in the
past and it works.

http://www.cisco.com/c/en/us/td/docs/net_mgmt/access_registrar/1-7/user/guide/odap.html
https://youtu.be/V7Qc25B-51I

Tnx
Arie

On Wed, Jul 5, 2017 at 3:35 AM Krzysztof Adamski <k-list at adamski.org> wrote:

> On Wed, 2017-07-05 at 08:23 +0100, James Bensley wrote:
> > On 4 July 2017 at 22:41, Juergen Marenda <cnsp at marenda.net> wrote:
> > >> You don't need to have a contiguous IP block in an IP Pool. You can
> simply
> > >> do something like this:
> > >>
> > >> TestBNG(config)# ip local pool dynamic-dsl 192.168.0.0 192.168.255.255
> > >> TestBNG(config)# ip local pool dynamic-dsl 172.16.0.0 172.31.255.255
> > >> TestBNG(config)# ip local pool dynamic-dsl 10.0.0.0 10.255.255.255
> > >
> > > Remember that there exists an special IPv4 Address-range for "Carrier
> Grade
> > > NAT".
> > >
> > > Why not assign fixed (real) IPv4/32 for each dial-up account ?
> > >
> > > Just my 0.01 $
> > >
> > > Juergen.
> >
> > We use static IPs for all xDSL customers/sites, one problem we have
> > from this is that each LNS (depending on which one the customer
> > connects to) is announcing loads of /32's into our iBGP that aren't
> > aggregatable/summary routes, which they would be if we had a unique
> > pool per LNS. We have thousands of extra routes in our iBGP because of
> > this, it's not a major issues but still not ideal.
> >
> > Cheers,
> > James.
>
> You can have each LNS aggregate part of the address space, then when a
> customer with IP that matches the aggregate lands on this LNS
> customers /32 won't be advertised, but when the customer lands on a
> different LNS /32 will go into your iBGP. Depending on luck you could
> cut in half the number of /32 in your iBGP.
>
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