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Layer2 Rate Limiters

Hi,

When I was replacing the standby sup engine on the 6509, I saw message: %MLS_RATE-4-DISABLING: The Layer2 Rate Limiters have been disabled.

Just wondering what does that mean? Sorry if it is a noob question.

Thanks!!

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Layer2 Rate Limiters

Layer 2 rate limiters can be configured ONLY if the global switching mode of the system is

NOT "truncated" mode.

You can see it using the following command:

6500#sh fabric switching-mode

Global switching mode is Truncated << ============= !!!!!

dCEF mode is not enforced for system to operate

Fabric module is not required for system to operate Modules areallowed to operate in bus mode Truncated mode is allowed, due to presence of DFC module

Module Slot Switching Mode

4 Bus

5 Bus

8 Crossbar

9 dCEF

6500#

I am assuming your 6500 is also in truncated mode(When the switch contains a fabric-enabled module and a nonfabric-enabled module, the fabric-enabled line cards operate in truncated mode) and hence default layer 2 rate limiters have been disabled. In newer IOS, the clarity of the message has been improved and should look something like

%MLS_RATE-4-DISABLING: The Layer2 Rate Limiters have been disabled, as switching is in truncated mode.

There will be also message:

3d19h: %MLS_RATE-4-NOT_SUPPORTED: This functionality is not configurable.

Hope this helps

2 REPLIES
Cisco Employee

Re: Layer2 Rate Limiters

Layer 2 rate limiters can be configured ONLY if the global switching mode of the system is

NOT "truncated" mode.

You can see it using the following command:

6500#sh fabric switching-mode

Global switching mode is Truncated << ============= !!!!!

dCEF mode is not enforced for system to operate

Fabric module is not required for system to operate Modules areallowed to operate in bus mode Truncated mode is allowed, due to presence of DFC module

Module Slot Switching Mode

4 Bus

5 Bus

8 Crossbar

9 dCEF

6500#

I am assuming your 6500 is also in truncated mode(When the switch contains a fabric-enabled module and a nonfabric-enabled module, the fabric-enabled line cards operate in truncated mode) and hence default layer 2 rate limiters have been disabled. In newer IOS, the clarity of the message has been improved and should look something like

%MLS_RATE-4-DISABLING: The Layer2 Rate Limiters have been disabled, as switching is in truncated mode.

There will be also message:

3d19h: %MLS_RATE-4-NOT_SUPPORTED: This functionality is not configurable.

Hope this helps

New Member

Re: Layer2 Rate Limiters

Thanks!!

You are exactly right!

Here is my output:

core1#sh fabric switching-mode

Global switching mode is Truncated

dCEF mode is not enforced for system to operate

Fabric module is not required for system to operate

Modules are allowed to operate in bus mode

Truncated mode is allowed, due to presence of CEF720, Standby supervisor module

Module Slot Switching Mode

1 Bus

2 Bus

3 Crossbar

5 Bus

6 Crossbar

7 Crossbar

8 Bus

9 Crossbar

It definitely helped!

Thanks again!

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