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cat2924-XL-EN reaches "Peak Total Bandwidth" and then drops packet

I have some cat2924-XL-EN and on each of those switches only one port is used as a trunk. All the rest are 100Mb and full-duplex set.

Our switches give quite near values with "Peak

Total Bandwidth" almost stuck at "Total Bandwidth Limit" - 1.

e.g.

cat2924#sh controllers switch

Switch registers:

Device Type : 0x00030073

Congestion Threshold : 0x0000D5A7

Peak Total Allocation : 0x00000031

Total Allocation : 0x00000000

Peak Total Bandwidth : 0x00000A28

Total Bandwidth : 0x00000000

Total Bandwidth Limit : 0x00000A29

Lower Bandwidth Limit : 0x0000003F

Switch Mode : 0x00100000

According to http://www.cisco.com/warp/public/473/19.html#5

it seems that there is a problem with "Peak Total Bandwidth".

On the above url, it says:

When the Total Bandwidth reaches the Total Bandwidth Limit

value, the switch has reached its full bandwidth capacity and begins to drop

packets. The Peak Total Bandwidth is the highest value attained by

the Total Bandwidth since the last time the show controller switch command

was executed.

Any ideas ? Any worries ?

Any other options other than replacing the switches ?

Besides, checking the same value on a cat3548-XL-EN gives a smaller value for a higher performance switch. Isn' t this strange ?

2 REPLIES
New Member

Re: cat2924-XL-EN reaches "Peak Total Bandwidth" and then drops

Check to see if the Peak Total Bandwidth stays high if you enter the command again. Since that shows only the highest usage since the last time the command was entered, it should go down the second time the command is issued (unless your bandwith utilization happens to be really high right then). If it keeps going up to near the Total Bandwidth Limit, there may be an issue. Also check your interfaces and see if you actually are dropping packets.

Re: cat2924-XL-EN reaches "Peak Total Bandwidth" and then drops

Thank you very much for your response.

In fact, this shows up with the same value every time that you enter the command, assuming that is overutilized, indeed.

There ARE dropped packets, when the Peak limit is exceeded.

Is there any other workaround to tackle with this?

Apart from limiting the broadcasts and the replacement of the switch, do you have any other suggestions?

Do you know, how many routers is the cat2924-XL-EN able to support ?

There are ~20 routers on this cat2924.

How many routers can be supported on cat2950 and cat3500 platforms ?

Is there any relevant matrix / url ?

Thank you in advance for your time and assistance.

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