Re: [RAM] Number of DFZ routers

On Mon, 28 May 2007 HeinerHummel@aol.com wrote:

>
> I think, these are excellent questions of common interest and would
> appreciate if knowledgeable folks communicated the asked information  on-line.
>
> Heiner
>
> In einer eMail vom 28.05.2007 00:36:19 Westeuropäische Normalzeit schreibt
> rw@firstpr.com.au:
>
> Can  anyone provide an estimate for the number of routers in
> the  DFZ?
>
> Transit routers  (DFZ)
>
> Multihomed border  routers  (DFZ)
>
> Singlehomed border routers
>

These are likely difficult to guess correctly... so I won't try, sorry.

> Can anyone  suggest the range of number of interfaces these
> routers have?  For  instance, what is the largest number of
> interfaces on an operational  router?

I think that the current 'best' number for this is likely the cisco IDB
maximum which is 2048? (idb = interface database) So, at a maximum a
router could have 2k interfaces (logical and physical).

I suspect that there are DSL platforms that scale beyond this, but they
may not live fully in the DFZ, the same probably applies to DOCSIS/UBR
sorts of devices.

>
> What would be a typical range of interface numbers  for
> transit routers?
>

Range being speed? or number?

> In addition to direct forwarding of Internet  traffic, and
> handling the communications paths between the  routers
> themselves, do transit routers often perform other  functions,
> such as handling MPLS?
>

This probably depends on the network in question... There are several
large providers that advertise use of MPLS in their core networks. The use
of MPLS could be purely for traffic engineering reasons or for services,
its not clear without asking the provider in question I suspect. Example
traceroutes may tell more:

 6  204.255.169.2 (204.255.169.2)  29 ms  16 ms  16 ms
 7  tbr1.wswdc.ip.att.net (12.123.8.114) [MPLS: Label 32690 Exp 0]  36 ms
48 ms  39 ms
 8  tbr1.sl9mo.ip.att.net (12.122.10.30) [MPLS: Label 32490 Exp 0]  34 ms
36 ms  37 ms

for instance...

> I would also be curious about  typical transit router models and
> interface speeds.
>

I suspect that most 'transit' routers in larger networks are the higher
end cisco/juniper devices supporting interface speeds of upwards of
2.5gbps.

> Please respond  off-list if this is too off-topic.
>
> -  Robin
>
>
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