Re: MAC address accounting on shared L2 IX - can it be done?

On Sun, Mar 18, 2007 at 12:43:51AM -0000, Phil Sykes wrote:
> 
> > Ah, it *is* the documentation which is obtuse   Your 
> > message made me check a bit more, and I finally
found the 
> > "show interfaces mac-database" command.
> > 
> > Now if the "Configuring MAC Address
Accounting" documentation 
> > had been a bit more explicit about what it did,
and had 
> > actually included a reference to the "show
interfaces 
> > mac-database", it would have been quite a bit
more helpful. 
> > Thanks Jared, no thanks to Juniper here.
> 
>  A couple of caveats that may be relevant to people
configuring this:
> 
>  - It doesn't work on aggregated Ethernet interfaces

	Yes it does.  We have collected data from aeX interfaces
facing
a public-IX before.  It does add a layer of abstraction in
that case
if your poller wasn't written with that in mind originally.

	(you need to collect the mac from multiple physical
interfaces from
the snmp mib and combine it for the mac->ip mapping in
your peeringdb
to tell which peer it is).

>  - It doesn't work on the fixed-optic Gigabit Ethernet
PICs (e.g.
> P-1GE-SX), only on the QPP PICs and SFP-based PICs.

>  mac-accounting is exposed via SNMP via the
JUNIPER-MAC-MIB (jnxMibs
> 23), which is potentially more useful than "show
interfaces
> mac-database" for long-term operational use.

	Certainly.

	- jared

-- 
Jared Mauch  | pgp key available via finger from jaredpuck.nether.net
clue++;      | http://puck.nether.net
/~jared/  My statements are only mine.
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