Valdis.Kletnieks@vt.edu schrieb:
>
>>>>Prefixes Change ASnum AS Description
>>>>3263 0->3263 AS4151 USDA-1 - USDA
>>>so I wonder what's wrong with them.
>
>I'm not sure which is more weird - a jump of over 3K routes, or the
>fact that the starting point is zero....
Just to make it clear: AS4151 was 9 month ago. Now we see history again
with new actors. (I guess the actual increase was done by various
ASN of
RENATER).
I wonder why aggregating is that difficult.
It's not, people are just lazy and since "nobody owns the internet
man", or maybe "it's all a bunch of tubes" there's nobody to force people
to be good actors. Perhaps it's time to bring back the old /19
filters that were started by sprint & such.
As we push closer to the ipv4 route table limits of cisco's 6500/7600 series (with anything less than Sup720-3bxl), I suspect lots of networks are going to be forced to start doing some sort of filtering of routes beyond just refusing >24-bit networks or cisco's going to sell a lot more Sup720-3bxl's, FAN2 trays, and power supplies in the next year or two.
The big question is, of course, whether to upgrade a 6500 and keep it on
life support, or bite the bullet and go for a whole new box. How much time
a -3bxl and careful filtering will buy you does depend heavily on where in
the Internet you are - but I'm willing to bet that a good number of sites
will go for the fork lift upgrade because there are *other* pressing things
coming up that the 6500 won't do either.
Remember - it only takes *one* truly mission-critical "must do" that a 6500
can't, and it's off to a less stressful corner of your network for that long
slide into retirement (on the other hand, I'm sure in 2016, there will *still*
be 6500's installed, just like I'm sure there's still 1996-vintage gear still
out there now...)
I'll concede that Jon is at least partially right - *somebody* is going to
be selling gear...
The big question is, of course, whether to upgrade a 6500 and keep it on
life support, or bite the bullet and go for a whole new box. How much time
a -3bxl and careful filtering will buy you does depend heavily on where in
the Internet you are - but I'm willing to bet that a good number of sites
will go for the fork lift upgrade because there are *other* pressing things
coming up that the 6500 won't do either.
With a 3bxl, you won't need careful filtering. All the lower Sups top out at or slightly below 256k routes. IIRC, the 3bxl claims to support 1M ipv4 routes. Anyone else care to guess at how far off 235k routes is?
I'll concede that Jon is at least partially right - *somebody* is going to
be selling gear...
Yeah...I posted recently on cisco-nsp that I think cisco's making a huge mistake not producing a Sup32-3bxl. When the Sup2 can't cope with "full routes" anymore, I suspect the Sup720-3bxl will already have been obsoleted by some higher end Sup. Then networks that would have bought Sup32-3bxl's for the route capacity, and don't really need the traffic capacity of the Sup720-3bxl will snap up Sup720-3bxl (and the required fan2s and power supplies) off the used market while bigger/richer networks upgrade to the Sup720-3bxl replacement.
It should be noted that the sup720-3a/3b tcam allocations (cef
maximum-routes) only gives 190k of the 256k theoretical max to IPv6 routes
by default. Anyone running a sup720 non-3bxl who has not manually adjusted
those cef maximum-routes is either blowing up or about to blow up any day
now, depending on how many internal routes they have and how much
filtering their upstreams are doing.
Of course this isn't a new problem, many of us are still running old
Foundry ironcore boxes with 700+ day uptimes and software so old it came
with 120k or 140k default maximum routes. Similiarly, cam aggregation on
such platforms (without enough cam to hold even close to enough routes for
a full table) is nothing new either. Cisco could easily implement cam
aggregation where they do not install a cef route entry if there is a
covering less-specific route pointing to the same nexthop(s). It is
hardly rocket science, and could extend the life of a 256k route tcam
platform for many years to come. But clearly Cisco would rather just sell
3bxl's.
