Wan Utillization issue

Unanswered Question
Feb 18th, 2010

We are currently experiencing high utillization on our regional WAN connections.

In this scenario, we used to track this situation using IP accounting on the WAN interfaces.

We recently upgraded WAN routers to cisco WS-C6509-E Mutilayer switches.

When we tried to perform IP accounting on these devices, We get a warning <Accounting will exclude mls traffic when mls is enabled>

That way we cannot track the defaulting hosts.


Does anyone have an idea how we can overcome this

I have this problem too.
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yjdabear Fri, 02/19/2010 - 06:06

Looks like once on board the cat6k ship, you're going to need to switch gear to NetFlow instead:

http://www.ciscosystems.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af1.shtml#ip_accounting

"IP Accounting excludes MLS traffic

In the Cisco Catalyst 6500 series, Multiple Layer Switching (MLS) is deployed in such a way that once a flow is established, traffic is directly switched at PFC (hardware-switched) and is not processed by the MSFC, hence the lack of continuous accounting. Only new or process-switched flows (software-switched) is recorded by IP accounting when enabled, and even then only until the entry is entered into the database. Thus, the previous warning message is normally displayed when you enable IP accounting on such a platform.

6500(config)#int fa8/40
6500(config-if)#ip accounting
Accounting will exclude mls traffic when mls is enabled.

NetFlow accounting is the preferred method. Refer to Configuring NetFlow for more information regarding to NetFlow."

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