Gregory Boehnlein wrote:
This is very similar to what we do. While we have several customers that
need larger subnets, the majority of our customers are using IP Unnumbered.
In some cases, we will provide the customer a /29 if they need additional
external IP addresses, but the configuration on their router uses the low IP
in the /29 as it's loopback interface. We send our default route out of the
interface, rather than to the remote gateway IP, so if we change the ip of
the loopback on our side, we do not need to adjust anything for the
customer.
That's not a bad idea. Though wouldn't pointing a default at an
interface force it to ARP constantly? Several hundred CEs ARPing
non-stop could be a load issue on your PE.
I'm not too worried about the loopback's IP changing. I only put a /24
on the loopback to get us started. I'll load it with customer DS1s
until I get to around 90% IP utilization and then create another
loopback with another /24 or perhaps a /23 this time around. I padded
the front of the subnet sufficiently to allow for future HA projects and
the unforeseeable. I can't foresee ever needing to change the IP on a
loopback once I have it in production.
We use outbound service policies on unnumbered interfaces just fine:
interface Serial10/1/0/3:0
description L3 OH/XXXX/XXXX to XXXXXXX channel 12
ip unnumbered Loopback0
no ip redirects
no ip unreachables
no ip proxy-arp
service-policy output llq
no fair-queue
down-when-looped
no clns route-cache
Excellent. QoS was something that occurred to me as I was writing my
original message.
ip route X.X.X.X 255.255.255.248 Serial10/1/0/3:0 name CustomerRouteA
So you'd prefer to route a larger customer assignment to the the
CE-facing interface instead of to their assigned IP unnumbered address?
I've been doing ip unnumbered since 1995 in production and it "just works".
There are undoubtedly some routers out there that might have issues, but any
Cisco device should be able to handle things just fine.
Very good. On the CE side I really don't anticipate many problems. I
see this as more of a CE knowledge thing than anything. I'm sure we'll
have several customers that need something special. I hope that for the
most part we can lump them all into an IP unnumbered design.
Thanks for the input
Justin
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