Rate-Limit BRI

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Aug 5th, 2008
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I was working with a co-worker who was seeing FTP choke the B channel when a remote router was on ISDN. Normally we use rate-limit on the frame-relay PVC's, which works great, but when I configured it on the BRI0/0/0 interface, I was not seeing hits on the ACL. Is rate-limit supported on BRI interfaces?

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Pravin Phadte Tue, 08/05/2008 - 09:22
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Hi,


Can you paste the configs if possible for bri and rate limits on the interface.


regards,


pravin

jasonviar Tue, 08/05/2008 - 09:29
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ip access-list standard 150

permit tcp any any eq 1364

permit tcp any eq 1364 any


int bri0/0/0

rate-limit output access-group 151 96000 12000 12000 conform-action transmit exceed-action drop

Pravin Phadte Tue, 08/05/2008 - 09:56
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Hi you dont need an acl for the interface

rate-limit output 96000 12000 12000 conform-action transmit exceed-action drop


as per you configs you need to set the rate limit for 96 kilo bits and drop after 96 kbits ?


Thats whats the rate limit calculation is for the config.


Let me know what bw you want to configure/


Regards,


Pravin


jasonviar Tue, 08/05/2008 - 10:11
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Previn,


Thanks for the quick response! We are using the ACL to only rate-limit certain traffic (port 1364), therefore not starving other application traffic. We use it on frame-relay pvc's and it works great. Just trying to figure out why when I do a show interface bri0/0/0 rate-limit, no traffic is being rate-limited, but the B-channels will have 225/255 rx load?


Jason

Pravin Phadte Tue, 08/05/2008 - 10:18
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Hi,


Is it possible to provide the output of the interface for all bri you have and the configs for the same.


Regards,


Pravin

jasonviar Tue, 08/05/2008 - 10:33
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At this point we are back on the frame-relay connection, so show output wouldn't be helpful. Here's the interface config.


interface BRI0/0/0

description Circuit ID and Carrier

bandwidth 30

ip address x.x.x.x y.y.y.y

ip accounting output-packets

ip nat outside

ip virtual-reassembly

rate-limit output access-group 151 96000 12000 12000 conform-action transmit exceed-action drop

encapsulation ppp

no ip mroute-cache

dialer idle-timeout 300

dialer map ip x.x.x.x name name broadcast xxxxxxxxxxx

dialer map ip x.x.x.x name name broadcast xxxxxxxxxxxx

dialer load-threshold 4 outbound

dialer watch-group 8

dialer-group 1

isdn switch-type basic-ni

isdn point-to-point-setup

isdn spid1 xxxxxxxxxxxxxx xxxxxxx

isdn spid2 xxxxxxxxxxxxxx xxxxxxx

no cdp enable

ppp authentication chap

end

Pravin Phadte Tue, 08/05/2008 - 10:39
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Hi,


This is the problem. bandwidth 30.


interface BRI0/0/0

description Circuit ID and Carrier

bandwidth 30


You have set the interface to calcalute the BW in kilobits.


So when you give show interface bri 0/0/0 it will calc according to the configured BW ie 30 Kb so it is showing you as 255/255.


If possible check also in the show interface bri0/0 where it shows as BW32K. Remove the command as no bandwdth 30. and you will see the output for show int bri0/0/0 as 64k or 128 not sure.


Bandwdith command is set for clocking forinterface.


Hope this helps


Regards

Pravin


jasonviar Tue, 08/05/2008 - 10:41
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We do use that for EIGRP as well, since the frame pvc's are set as having higher bandwidth. My issue is not with the 255/255, more that the rate-limit is not working during congestion time.

Pravin Phadte Tue, 08/05/2008 - 10:51
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Hi,


Since it eigrp i feel it should be in there as per you configs.


I would also suggest you to try with the commnad "traffic-shape" since you are trying to limit the O/P traffic only this could be helpful you can also use the same acl for the command.


Hope this helps


Regards,


Pravin

jasonviar Tue, 08/05/2008 - 10:54
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Thanks again. I will look into it, but unsure why the command takes on the interface but does not work. Thanks - Jason

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