The only time I have seen this low value cause trouble is in a point-to-multipoint network where the customer is running OSPF or some other routing protocol that uses link local multicast for neighbor discovery. In this case, I usually tell customers to increase the values by a factor of 10.
I guess what I wanted to verify is that my logic (and math) was correct and that the default values are not set correctly. These values should be calculated for 1500 packets not 7111 bytes. Would you agree?
I am stay reading of "frame-relay broadcast-queue" and find this topic.
"for me 256000 bps / 36 fps / 8 bit/bytes would give an average size of 889 bytes / frame
but I think we should see the rate limiter as a combination of a traffic volume rate and of a pps limit."
But it is not 256000bps, is 256000 Bytes per second that is 2048000 bps.
I am tried to see the math logic's to this but I am so confuse.
the Cisco's Default bandwidth in serial interface is 1544kbits (T1) and not 2048kbps (E1), then why the Cisco technical Documentation take E1 as default as reference value?, it may not make sense "logic".
The brodcast-queue command is:
The formula for calculate the byte rate is:
take a byte-rate less than both of the following
N/4 (times the minimum remote access / bytes per second) - N number of DLCI
1/4 the local access rate / bytes per second
this calculate may make sense given by default IOS reserve the 25% of bandwith for control's traffic on all interface (as analogic).
then when a interface use "encapsulation frame relay" the "frame relay broadcast queue" another queue is create it; where the broadcast traffic of routing protocols pass for it and has priority while the traffic do not exceed or parameters. (the broadcast traffic of routing protocols do not flow any more over the normal queue).
About, assuming 250-byte packets is possible that Cisco take RIP as reference routing protocol, the maximum routes per packet on RIP packet is 25 and each entry need 10 Bytes. (25 routes * 10 Bytes/entry = 250 Bytes).
but it analysis per parameter is not useful, the question about the command still stay active.
Who can I calculate or know the better parameters to used, when I use the command "frame-realy broadcast-queue" in another case as "Frame Relay traffic shaping" the IOS calculate other parameter (Be and Bc / with Tc=125ms) with only 1 o more explicit value. Or when I need to calculate the bandwidth for priority bandwith on LLQ for voice traffic are a formula based on codec and sample interval.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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