[c-nsp] DNS Naming conventions for Switches

[Murphy, William]

We use CNAME which equals the hostname configured on the device.  The CNAME
points to the management interface of the device.  For example a layer-2
switch uses VLAN 100 for management in our environment so we have A record
like son-4n-l2-1-vl100.domain and CNAME son-4n-l2-1 that points to this A
record.  For routers/l3 switch we have loopbacks and our convention is to
use Loopback 0 for the management interface, hence A record of
son-3s-l3-1-lo0.domain with CNAME son-3s-l3-1 which points to this A record.
We have a convention of <bldg>-<location>-<function>-<number> for naming our
devices.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andrew Miehs
Sent: Thursday, September 02, 2010 11:27 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] DNS Naming conventions for Switches

Hi all,

have spent the last couple of hours looking and haven't been able to find a
satisfactory solution to naming cisco siwtch interfaces.

I am currently looking after a lot of Cisco 6500s and would like to clean up
DNS so that reverse lookups = forward etc.

I would like to suggest that we do the following:

  lo1.switchname.domain.com
  gi1-1-1.switchname.domain.com
  po1.switchname.domain.com
  v1.switchname.domain.com
  te2-1-1.switchname.domain.com

  switchname.domain.com CNAME -> lo1.switchname.domain.com

lo1 (loopback 1) is the management IP address of the switch.

I have noticed however that some NMS solutions uses the reverse lookup of
the entered address (in this case 'switchname') for filling in the name in
the software.

Does anyone have any better suggestions, or should I just enter the
management interface into DNS without the 'lo1' and on the switches without
loopbacks?
I have the same issue with the 3750s - although there the management
interface is a vlan interface, and not a loopback.

Thanks for your comments,

Andrew
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