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Re: Thoughts on best practice for naming router infrastructure in DNS

  • From: Leigh Porter
  • Date: Fri Jun 29 11:22:55 2007

Then you get some networks who name all the routers after cheeses or characters from bill and ben the flowerpot men.


Mark Tinka wrote:
On Friday 15 June 2007 00:27, Olsen, Jason wrote:

So, what practices do you folks follow? What are the up
and downsides you encounter?

At my previous employer, we came up with a formula that we were happy with. For reverse DNS, it involves:

* defining the interface
* defining the device function
* defining the local location
* defining the international location

o device interface could be:


  this also takes subinterfaces into account; for cases where
  we've had to classify a switch VI the "routes" IP traffic:


o device function could be:

	br-gw (border router)
	cr-gw (core router)
	cr-sw (core switch)
	edge-gw (edge router)
	edge-sw (edge switch)

o device local location; we normally define this using the
  IATA 3-letter international city/airport code:

	LAX (Los Angeles
	ABV (Abuja)
	DXB (Dubai)
	CPH (Copenhagen)
	MEL (Melbourne)
	HKG (Hong Kong)
  it is not uncommon to have towns or cities being
  abbreviated by the locals in some other way, either
  because they do not care for the IATA code :-), or if
  they do, are not included in the IATA database; in this
  case, you may use your imagination; for us, depending on
  the length of the name, we spell out the full town's name.

o device international location is easily defined if your TLD
  is based on a country, e.g., .uk, .ae, .ke, .za, .na, e.t.c.
  for situations where your domain name would end in a
  non-region specific TLD, e.g., .com, .net, .org, e.t.c., one
  would prefix a state or country (in the case of a global
  network) to the domain name, e.g.:

  things could get interesting if you setup multiple PoP's in
  another location that would still fall under your .com or
  other such TLD, but there are ways to fix that :-).

So, a final example of, say, core router number 5 and edge switch number 3 located in a datacentre of a local Australian ISP in Melbourne:

Say a large network, whose home network was the US, decided to setup a single PoP in Johannesburg that included one core router and one border router, but whose domain name ended in .net, it would look something like this:

You could then use the script Joe Abley kindly posted earlier to automatically generate your entries.

Of course, this was our own approach. Different folks have different strokes.

Hope this helps.