[cisco-nas] Problems with rate-limit

[Tassos Chatzithomaoglou]

Did you try to raise the values of your rate limit, especially the burst ones (8000,12000)?


Richard Greasley wrote:

> Hello all,
> We have a problem with rate-limiting on our cisco 7204VXT running IOS
> 12.2(7a).
> The problem is that I'm seeing  packet loss on this FastEthernet link.
> I did a standard cisco ping (not extended) and I was getting 96-97% success
> rate, when I did an extended ping with settings:
> fate#ping
> Protocol [ip]:
> Target IP address: xxx.xxx.xxx.xxx
> Repeat count [5]: 1000
> Datagram size [100]: 1428
> Timeout in seconds [2]: 1
> Extended commands [n]: y
> Source address or interface:
> Type of service [0]:
> Set DF bit in IP header? [no]:
> Validate reply data? [no]: yes
> Data pattern [0xABCD]:
> Loose, Strict, Record, Timestamp, Verbose[none]:
> Sweep range of sizes [n]: y
> Sweep min size [36]:
> Sweep max size [18024]:
> Sweep interval [1]:
> Type escape sequence to abort.
> Sending 17989000, [36..18024]-byte ICMP Echos to xxx.xxx.xxx.xxx, timeout is
> 1 seconds: Reply data will be validated
> 
> I got 81-83% success rate
> 
> The interface settings are:
> interface FastEthernet0/0.135
>  description UNDP IP Circuit, Ip block xxx.xxx.xxx.xxx (255.255.255.224)
>  encapsulation dot1Q 135
>  ip address xxx.xxx.xxx.xxx 255.255.255.224
>  ip accounting mac-address input
>  ip accounting mac-address output
>  rate-limit input 256000 8000 12000 conform-action transmit exceed-action
> drop
>  rate-limit output 256000 80000 12000 conform-action transmit exceed-action
> drop
> 
> When I remove the rate-limiting from the interface, both extended and
> regular, pings go through without any problems whatsoever, the customer is
> not using the circuit as yet.
> When I put back on rate-limiting and I did some ftp download tests from my
> end I saw that I was not getting even 16KB/s, removed the rate-limit and I
> was getting close to 6000KB/s.
> Anyone saw anything similar and/or have a solution to this?
> 
> Thanks,
> Richardg;
> 
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> cisco-nas at puck.nether.net
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> 

-- 
***************************************
       Chatzithomaoglou Anastasios
Network Design & Development Department
              FORTHnet S.A.
          <achatz at forthnet.gr>
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