Broadcast Traffic strom control

Unanswered Question
Sep 10th, 2009
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Hi All,


I am looking to configure Broadcast Traffic strom control in some Gig ports in one of my 4507R.

If I set the storm-control broadcast level 50.00 in one Gig port then it will drop the broadcast traffic once reached the threshold (50.00) right?

I heard that once the port reached the threshold it will drop all traffic untill broadcast traffic come down to the threshold (50.00)


Can someone please help me in this and how to achive my goal.



Regards,

Naidu.

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deyadav Thu, 09/10/2009 - 01:54
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  • Cisco Employee,

Hi Naidu,


Storm Control has two implementations based on the Supervisor you are using:


- Hardware-based Storm Control Implementation: WS-X4516, WS-X4013+10GE, WS-X4516-10GE, WS-C4948, WS-C4948-10GE, and Supervisor Engine 6-E


- Software-based Storm Control Implementation: WS-X4515, WS-X4014, and WS-X4013+ support storm control in hardware on non-blocking gigabit ports and in software on all other ports


Incase of Hardware based implementation when broadcast threshold reaches, subsequent broadcast packets are filtered out, and no affect on non-broadcast traffic.


Incase of Software based implementation, all traffic incoming on the port is dropped unless it further drops down than the lower threshold level. Note control traffic is not dropped.


So, the isssue arises with Software based implementation, so you need to take into account the Supervisor being used + Line cards/ports you are using.


You may use the command:


sh interface x/y capabilities


and check for Broadcast/Multicast suppression support.


http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/46sg/configuration/guide/bcastsup.html


Hope this helps.


Regards,

Deepak Yadav

ilnaiduccna Thu, 09/10/2009 - 03:25
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Hi Deepak,


Please find the below module info. I think my Supervisor wil support only Software-based Strom Control Implementation is that correct?


If we implement software based strom control, it will affect non-broadcast traffic which is real and important traffic right?


Mod Ports Card Type Model Serial No.

---+-----+--------------------------------------+------------------+-----------

1 2 Supervisor IV 1000BaseX (GBIC) WS-X4515 JAE1037BGJT

2 2 Supervisor IV 1000BaseX (GBIC) WS-X4515 JAE1037BGJE

3 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1045ET42

4 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1045EQ6A

5 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1041D6PW



Regards,

Naidu.

deyadav Thu, 09/10/2009 - 04:45
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  • Cisco Employee,

Hi Naidu,


With SUP IV, there is a limitation that with blocking ports, Storm control would be implemented in Software, however in hardware for non-blocking ports. So we may still be able to achieve hardware implementation if we have non-blocking ports.


SupIV has two uplink non-blocking ports, so they would support Storm control in hardware.


However for WS-X4448-GB-RJ45 line cards, I suppose you only have blocking ports, Bandwidth is allocated across six 8-port groups, providing 1 Gbps per port group.


You may use the command:


sh interface gig3/1 capabilites

and check for the Storm control support, It would 'sw' in case of Line card.


Few line card which have non-blocking ports:

6-port 1000 Base-X (GBIC) Gigabit Ethernet module (WS-X4306-GB)


First two GBIC ports of 18-port Server Switching GE module (WS-X4418-GB)


GBIC ports on GE Switch Module (WS-X4412-2GB-T) & GBIC ports of the WS-X4232-GB-RJ module


In case of blocking ports, you may define a threshold for Higher and Lower close to each other to resume traffic for that port:


storm-control broadcast level 50 49


As soon as threshold hits 50 traffic stops, however if it goes below 49, traffic resumes.


For better performance with Storm Control consider upgrading the Supervisor or using non-blocking Line card ports.


Hope this helps.


Regards,

Deepak Yadav

ilnaiduccna Fri, 09/11/2009 - 01:23
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Hi Deepak,


Thanks for your well and nice explaination.


How we can find the non blocking ports?

If i have non blocking ports then I can connect the uplink port from IBM blade and can implement hardware strom control which is more advantage. Please correct me if i am wrong.


By finding in all the ways finally came to know that I can only enable Software


Can you please give me the commands for Software strom control block and Hardware strom control block.


Plese find the below Line card info and one of the Uplink port capabilities which is from from IBM blade .


Switch#sh module

Chassis Type : WS-C4507R


Power consumed by backplane : 40 Watts


Mod Ports Card Type Model Serial No.

---+-----+--------------------------------------+------------------+-----------

1 2 Supervisor IV 1000BaseX (GBIC) WS-X4515 JAE1037BGJT

2 2 Supervisor IV 1000BaseX (GBIC) WS-X4515 JAE1037BGJE

3 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1045ET42

4 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1045EQ6A

5 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45 JAE1041D6PW


M MAC addresses Hw Fw Sw Status

--+--------------------------------+---+------------+----------------+---------

1 0019.06d0.d5c0 to 0019.06d0.d5c1 5.1 12.2(20r)EW1 12.2(31)SGA Ok

2 0019.06d0.d5c2 to 0019.06d0.d5c3 5.1 12.2(20r)EW1 12.2(31)SGA Ok

3 0019.56c9.09b0 to 0019.56c9.09df 1.3 Ok

4 0019.56c9.0890 to 0019.56c9.08bf 1.3 Ok

5 0019.2fad.3480 to 0019.2fad.34af 1.3 Ok


Mod Redundancy role Operating mode Redundancy status

----+-------------------+-------------------+----------------------------------

1 Active Supervisor RPR Active

2 Standby Supervisor RPR Standby cold



Switch#sh int gi3/30 capabilities

GigabitEthernet3/30

Model: WS-X4448-GB-RJ45-RJ-45

Type: 10/100/1000-TX

Speed: 10,100,1000,auto

Duplex: half,full,auto

Auto-MDIX: no

Trunk encap. type: 802.1Q,ISL

Trunk mode: on,off,desirable,nonegotiate

Channel: yes

Broadcast suppression: percentage(0-100), sw

Flowcontrol: rx-(off,on,desired),tx-(off,on,desired)

VLAN Membership: static, dynamic

Fast Start: yes

Queuing: rx-(N/A), tx-(1p3q1t, Shaping)

CoS rewrite: yes

ToS rewrite: yes

Inline power: no

SPAN: source/destination

UDLD: yes

Link Debounce: no

Link Debounce Time: no

Port Security: yes

Dot1x: yes

Maximum MTU: 1552 bytes (Baby Giants)

Multiple Media Types: no

Diagnostic Monitoring: N/A



Regards,

Naidu.

ilnaiduccna Tue, 09/15/2009 - 06:35
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Hi Experts,


Can someone help me in this please.

Thanks in advance.


Regards,

Naidu

deyadav Tue, 09/15/2009 - 11:07
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  • Cisco Employee,

Hi Naidu,

I replied to your last post earlier, not sure what went wrong as it never got posted. Anyways here it is again.


There is no separate method to configure Hardware or Software Based Storm Control. CLI are the same, it's based on the port which you configure are trying to configure, along with the Supervisor running.


Considering Chassis configuration you have have, the Supervisor has two uplink ports which are the only non-blocking ports.


You can verify this by running the same command, however for Supervisor Ports.


sh inter gig1/1 capabilities


Broadcast suppression: percentage(0-100), hw >>> would be indicated there suggesting storm control is handled in hardware.


For the Line cards ports, like the one you posted:

Broadcast suppression: percentage(0-100), sw >>>>It states Software (sw) handling.


So, the option to accomplish hardware storm control would make more sense if you upgrade the Supervisor or move to the line cards i Referred which have non-blocking ports.


Although this configuration might help you, however still at one stage all traffic would be dropped once Higher Threshold is reached:


storm-control broadcast level 50 49


As soon as threshold hits 50% entire traffic on port stops, however if it goes below 49, traffic resumes.


Hope this helps.

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