The point of node splits is to lower customers per SG, you
can’t just split and stay on the same chassis if you’re at
capacity on slots.
If you take the Comcast approach and start pushing fiber
deeper in order to remove actives your node counts sky rocket.
All the whole they’re lowering counts on SGs as well.
Even us little guys or working on lowering customers per
SG, they have to be moved somewhere which would be another
chassis if you’re out of free connectors on like cards.
Like
Sent from my iPhone
Aaron, I was thinking something similar. I've never
once had a node
split require moving a customer to a different CMTS.
Even the very old
and (relatively) low capacity 7200 VXR could serve
several nodes per
line card and supported several line cards per
chassis. Newer cBR8, E6k,
and the like can serve many many times more
customers across dozens of
nodes. Every L3 CMTS I've worked on uses something
akin to ip unnumbered
so as long as the customer stays on the same CMTS,
their IP address will
continue to work regardless of what interface or
line card their
connection terminates on.
On 5/8/2020 2:34 PM, Aaron Gould wrote:
We have a provisioning
system (promptlink) that we use to map cable modems
to their static ip
addresses. The provisioning system has a gui front
end
and it sits on linux and
also acts as a dhcp server, etc. This is the same
ip address that we use for
cable-helper (like ip-helper on a cmts bundle ip
interface) to forward dhcp
requests from cable modem cpe, via the cmts, and
unicasted to promptlink and
then the static ip address reservation within
the promptlink is sent back
to the cpe
This all continues to work,
even during node splits, as long as we don't
move that cm cpe to a
different cmts... which would rarely happen since it's
across town to get to our
other RF environment served be a different cmts
using a different static ip
subnet... since we don't do L2 via cmts's in
order to stitch back that ip
into a more globally located static subnet...
again, we don't do that. If
the customers moves locations, into a different
cmts area, that would be
required to give back the single static /32 ip and
get a different on. Unless
they were a multi-static customer buying like a
/29... in which case we have
no problem moving that /29 subnet off that cmts
and onto another one.
That's easy.
We do however have more
centrally located subnets for some of our single
static ip customers in
FTTH... but not CMTS docsis.
-Aaron
-----Original Message-----
From: NANOG
[mailto:nanog-bounces@nanog.org] On Behalf Of Javier
Gutierrez
Guerra
Sent: Thursday, May 7, 2020
3:50 PM
To: nanog@nanog.org
Subject: How to manage
Static IPs to customers
Hi there,
Just wanted to reach out and
get an idea how is people managing customers
with static Ips, more
specifically on Docsis networks where the customer
could be moved between
cmts's when a node is split
Thanks in advance for all
responses,
Javier Gutierrez Guerra